Structure of 22802-67-1
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CAS No. : | 22802-67-1 |
Formula : | C9H11NO3 |
M.W : | 181.19 |
SMILES Code : | COC(=O)C1=C(OC)C=CC(N)=C1 |
MDL No. : | MFCD08458835 |
InChI Key : | PSCXCIPPRCFAAO-UHFFFAOYSA-N |
Pubchem ID : | 89843 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With hydrogen; palladium(II) hydroxide; In methanol; at 20℃; | A mixture of 263-1 (400 mg, 1.89 mmol) and Pd(OH)2 (200 mg) in MeOH (50 mL) was stirred under H2 atmosphere at room temperature overnight. When the reaction was completed, the mixture was filtered, and the filtrate was concentrated to give a crude product, which was purified by silica gel column chromatography (CH2Cl2/MeOH = 50/1) to afford b-263 (350 mg, 100% yield) as yellow oil. |
95% | With water; ammonium chloride; zinc; In ethanol; for 3h;Heating / reflux;Product distribution / selectivity; | Methyl 2-methoxy-5-nitro-benzoate (300 mg), ammonium chloride (228 mg), and zinc (929 mg) were suspended in ethanol (10 ml) and water (0.5 ml), and the suspension was stirred under reflux for 3 hr. The reaction mixture was filtered, and the solvent was removed from the filtrate by distillation under the reduced pressure. A saturated aqueous sodium hydrogencarbonate solution was added to the residue, and the mixture was extracted with chloroform. The chloroform layer was washed with water and saturated brine and was dried over anhydrous magnesium sulfate. The solvent was removed by distillation under the reduced pressure, and the residue was purified by column chromatography with an acetone-chloroform system to give methyl 5-amino-2-methoxy-benzoate (244 mg, yield 95%). Methyl 5-amino-2-methoxy-benzoate (244 mg) and 5-methoxymethylene-2,2-dimethyl-[1,3]dioxan-4,6-dione (228 mg) were dissolved in 2-propanol (3 ml), and the solution was stirred at 100C for 15 hr. The solvent was removed by distillation under the reduced pressure, and the residue was washed with diethyl ether to give methyl 5-[(2,2-dimethyl-4,6-dioxo-[1,3]dioxan-5-ylidenemethyl)-amino]-2-methoxy-benzoate (248 mg, yield 55%). |
With hydrogen;palladium(II) hydroxide/carbon; In methanol; under 760.051 Torr; for 18h; | Step 1 :; Methyl 2-methoxy-5-nitrobenzoate 13-1 (6.21 g, 29.4 mmol) was suspended in MeOH (100 mL) and 20% Pd (OH) 2/C (500 mg) was added. The mixture was stirred under a hydrogen atmosphere (1 atm) for 18 h. The catalyst was removed by filtration and the solvent evaporated under reduced pressure to give a residue of compound 13-2 (5.256 g), which was used as such in step 2. |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf=0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9H11NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf=0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9H11NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf=0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9H11NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
With hydrogen;5%-palladium/activated carbon; In ethyl acetate; under 1064.07 Torr; for 5h; | The 2-{2-methoxy-4-[6-methoxy-7-(N-methylcarbamoyl)quinolin- i5 4-yloxy]phenyl} acetic acid used as a starting material was prepared as follows :-A mixture of methyl 2-methoxy-5-nitrobenzoate (20.3 g), 5% platinum-on-carbon catalyst (1.5 g) and ethyl acetate (300 ml) was stirred under 1.4 atmospheres pressure of hydrogen for 5 hours. The catalyst was removed by filtration and the filtrate was evaporated. There was thus obtained methyl 5-amino-2-methoxybenzoate (17 g); 1H NMR: (CDCl3) 3.8420 (s, 3H), 3.89 (s, 3H), 6.86 (m, 2H), 7.19 (m, IH); Mass Spectrum: M+H+ 182. | |
With hydrogen;platinum on carbon; In ethyl acetate; under 1064.07 Torr; for 5h; | A mixture of methyl 2-methoxy-5-nitrobenzoate (20.3 g), 5% platinum-on-carbon catalyst (1.5 g) and ethyl acetate (300 ml) was stirred under 1.4 atmospheres pressure of hydrogen for 5 hours. The catalyst was removed by filtration and the filtrate was evaporated. There was thus obtained methyl 5-amino-2-methoxybenzoate (17 g); 1H NMR: (CDCl3) 3.84 (s, 3H), 3.89 (s, 3H), 6.86 (m, 2H), 7.19 (m, 1H); Mass Spectrum: M+H+ 182. | |
With hydrogen;palladium(II) hydroxide/carbon; In methanol; under 760.051 Torr; for 18h; | Methyl 2-methoxy-5-nitrobenzoate (6.21 g, 29.4 MMOL) was suspended in MEOH (100 mL) and 20% Pd (OH) 2/C (500 mg) was added. The mixture was stirred under a hydrogen atmosphere (1 atm) for 18 h. The catalyst was removed by filtration and the solvent evaporated under reduced pressure (5.256 g). | |
15 g | With palladium 10% on activated carbon; hydrogen; In methanol; under 3620.13 - 4137.29 Torr; | A solution of methyl 2-methoxy-5-nitrobenzoate (20.0g, 0.097 mol) in methanol (300 mL) and 10% Pd/C (5.0 g) was stirred under hydrogen atmosphere under 70-80 psi pressure in Parr apparatus for 4-5 h. The reaction mass was filtered and the obtained filtrate was concentrated to afford 15.0 g of desired product. 1H NMR (300 MHz, DMSO d6): δ 3.67 (s, 3H), 3.74 (s, 3H), 4.96 (br s, 2H), 6.75 (dd, J = 2.4 Hz, 1H), 6.85 (d, = 8.7 Hz, 1H), 6.92 (s, 1H); MS (m/z): 182.25 (M+H)+. |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf=0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9H11NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
With hydrogen;5%-palladium/activated carbon; In methanol; under 2585.81 Torr; for 17h; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf=0.18 (silica gel, ethyl acetate/methanol 1/1.). Elemental Analysis calculated for C9H11NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate invacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2 SO4, filter, and evaporate invacuo to give methyl 2-methoxy-5-aminobenzoate. Rf =0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9 H11 NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mmol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2 SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf =0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9 H11 NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. | |
palladium; | Combine methyl 2-methoxy-5-nitrobenzoate (13.3 g, 63 mrnol) and methanol. Add 5% palladium-on-carbon (0.66 g). Hydrogenate on a pressure apparatus at 50 psi. After 17 hours, filter through celite to remove the catalyst and evaporate the filtrate in vacuo to give a residue. Combine the residue and dichloromethane and extract with water. Dry the organic layer over Na2 SO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-aminobenzoate. Rf =0.18 (silica gel, ethyl acetate/methanol 1/1). Elemental Analysis calculated for C9 H11 NO3: C, 59.66; H, 6.12; N, 7.73. Found: C, 59.44; H, 6.04; N, 7.62. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; N-ethyl-N,N-diisopropylamine; In dichloromethane; | PREPARATION 41 2-Methoxy-5-methylsulfonamidobenzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.5 g, 8.3 mmol) and dichloromethane (25 mL). Cool in an ice bath. Add N,N-diisopropylethylamine (3.17 mL, 18.2 mmol) and methanesulfonyl chloride (0.71 mL, 9.1 mmol). After 30 minutes, warm to ambient temperature. After 4 hours, dilute the reaction mixture with dichloromethane and extract three times with a 1 M aqueous hydrochloric acid solution and then brine. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with 3% methanol/dichloromethane/0.1% concentrated aqueous ammonia to give methyl 2-methoxy-5-methylsulfonamidobenzoate: mp; 82-83 C. Elemental Analysis calculated for C10H13NO5S: C, 46.32; H. 5.05; N, 5.40. Found C, 46.44; H, 4.96; N, 5.19. | |
With pyridine; | (1) To a solution of <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (300 mg) and dry pyridine (3 ml), methanesulfonyl chloride (210 mg) is added dropwise with ice cooling and stirring, and the resultant mixture is stirred at room temperature for 1 hour. The reaction mixture is acidified with 6 N hydrochloric acid and shaken with methylene chloride. The organic layer is washed with water, dried over sodium sulfate, and evaporated under reduced pressure to remove the methylene chloride. The residue is chromatographed on a column of silica gel, which is eluted with methylene chloride--2% methanol/methylene chloride, and the elude is evaporated to remove the solvent. The residue is recrystallized from ethyl acetate/isopropyl ether to give methyl 2-methoxy-5-methanesulfonamidobenzoate (381 mg) as colorless prisms melting at 84 to 86 C. Anal. Calcd. for C10 H13 O5 NS 0.1/10H2 O: C,46.32; H,5.05; N,5.40; S,12.37. Found: C,45.77; H,5.14; N,5.30; S,12.32. | |
With hydrogenchloride; N-ethyl-N,N-diisopropylamine; In dichloromethane; | Preparation 41 2-Methoxy-5-methylsulfonamidobenzoic Acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.5 g, 8.3 mmol) and dichloromethane (25 mL). Cool in an ice bath. Add N,N-diisopropylethylamine (3.17 mL, 18.2 mmol) and methanesulfonyl chloride (0.71 mL, 9.1 mmol). After 30 minutes, warm to ambient temperature. After 4 hours, dilute the reaction mixture with dichloromethane and extract three times with a 1 M aqueous hydrochloric acid solution and then brine. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with 3% methanol/dichloromethane/0.1% concentrated aqueous ammonia to give methyl 2-methoxy-5-methylsulfonamidobenzoate: mp; 82-83 C. Elemental Analysis calculated for C10H13NO5S: C, 46.32; H, 5.05; N, 5.40. Found C, 46.44; H, 4.96; N, 5.19. |
With N-ethyl-N,N-diisopropylamine; In dichloromethane; | PREPARATION 41 2-Methoxy-5-methylsulfonamidobenzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.5 g, 8.3 mmol) and dichloromethane (25 mL). Cool in an ice bath. Add N,N-diisopropylethylamine (3.17 mL, 18.2 mmol) and methanesulfonyl chloride (0.71 mL, 9.1 mmol). After 30 minutes, warm to ambient temperature. After 4 hours, dilute the reaction mixture with dichloromethane and extract three times with a 1 aqueous hydrochloric acid solution and then brine. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with 3% methanol/dichloromethane/0.1% concentrated aqueous ammonia to give methyl 2-methoxy-5-methylsulfonamidobenzoate: mp; 82-83 C. Elemental Analysis calculated for C10H13NO5S: C, 46.32; H, 5.05; N, 5.40. Found C, 46.44; H, 4.96; N, 5.19. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In tetrahydrofuran; at 20℃; | Step 2:; The aniline 13-2 from step 1 (5.23 g) was dissolved in THF (50 mL) and acetic anhydride (2.984 g) was added. The mixture was stirred overnight at room temperature. The white suspension was concentrated under reduced pressure to a white paste, tert-butylmethyl ether (TBME, 20 mL) was added and while stirring, hexane (100 mL) was added slowly. The suspension was then stirred for an additional 2h and the solid collected by filtration. The product 13-3 was washed with hexane and dried. in air (6.372 g). | |
The aniline from above (5.23 g) was dissolved in THF (50 mL) and acetic anhydride ( 2.984 g) was added. The mixture was stirred overnight at room temperature. The white suspension was concentrated under reduced pressure to a white paste, TERT- butylmethyl ether (TBME, 20 mL) was added and while stirring, hexane (100 mL) was added slowly. The suspension was then stirred for an additional 2h and the solid collected by filtration. The product was washed with hexane and dried in air (6.372 g). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In tetrahydrofuran; at 0 - 20℃; for 2h; | PREPARATION 19 Synthesis of 2-methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 20℃; for 4h; | To a solution of <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (89 mg) in dichloromethane (1 mL) was added triethylamine (0.1 mL) and a solution of the compound prepared in Reference Example 3 in dichloromethane (1 mL) sequentially. The reaction mixture was stirred at room temperature for 4 hours. 1N hydroxychloric acid was added to the reaction mixture, which was extracted with ethyl acetate. The extract was washed with saturated aqueous solution of sodium hydrogen carbonate and brine, dried over anhydrous magnesium sulfate and concentrated. The obtained residue was purified by column chromatography on silica gel (chloroform : methanol = 50 : 1) to give the title compound (197 mg) having the following physical data. TLC : Rf 0.48(hexane : ethyl acetate = 1 : 1); NMR (CDCl3) : δ7.73-7.67 (m, 2H), 7.31-7.11 (m, 7H), 6.99-6.80 (m, 4H), 3.95-3.87 (m, 8H), 2.98 (t, J = 7.5 Hz, 2H), 2.68-2.56 (m, 4H), 1.87-1.45 (m, 6H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With N-ethyl-N,N-diisopropylamine; In dichloromethane; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.5 g, 8.3 mmol) and dichloromethane (25 mL). Cool in an ice bath. Add N,N-diisopropylethylamine (3.2 mL, 18.2 mmol), and acetyl chloride (0.62 mL, 9.7 mmol). Warm to ambient temperature. After 4 hours, dilute the reaction mixture with dichloromethane and extract three times with half saturated aqueous ammonium chloride solution. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with 3% methanol/dichloromethane/0.1% concentrated aqueous ammonia to give methyl 2-methoxy-5-acetamidobenzoate: mp; 132-134 C. Elemental Analysis calculated for C11H13NO4: C, 59.19; H, 5.87. Found C, 59.04; H, 5.86. | |
With N-ethyl-N,N-diisopropylamine; In dichloromethane; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.5 g, 8.3 mmol) and dichloromethane (25 mL). Cool in an ice bath. Add N,N-diisopropylethylamine (3.2 mL, 18.2 mmol), and acetyl chloride (0.62 mL, 9.7 mmol). Warm to ambient temperature. After 4 hours, dilute the reaction mixture with dichloromethane and extract three times with half saturated aqueous ammonium chloride solution. Dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with 3% methanol/dichloromethane/0.1% concentrated aqueous ammonia to give methyl 2-methoxy-5-acetamidobenzoate: mp; 132-134 C. Elemental Analysis calculated for C11H13NO4: C, 59.19; H, 5.87. Found C, 59.04; H, 5.86. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture invacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. | |
In acetic acid; | Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (3.94 g, 21.7 mmol) and triethyl orthoformate (12.8 g, 86.7 mmol) in glacial acetic acid (20 mL). After 20 hours, concentrate the reaction mixture in vacuo to remove ethanol. Add glacial acetic acid (20 mL) and sodium azide (5.64 g, 86.7 mmol). Heat to 70 C. After 1 hour, add glacial acetic acid (10 mL) and continue to heat to 70 C. After an additional hour, cool the reaction mixture to ambient temperature, dilute with water (500 mL). Collect the solid by filtration, rinse with water, and dry to give methyl 2-methoxy-5-(1H-tetrazol-1-yl)benzoate. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; sodium hydroxide; sodium carbonate; sodium nitrite; In sodium sulfide; water; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.0 g, 5.6 mmol) and 12 M aqueous hydrochloric acid solution (1.2 g and cool in an ice bath. Add a solution of sodium nitrite (0.37 g, 5.3 mmol) in water (3 mL). After 1.5 hours, add ethyl xanthic acid, sodium salt (0.76 g, 6.3 mmol) and sodium carbonate (0.67 g, 6.3 mmol). After 2 hours, evaporate in vacuo and add sodium sulfide (0.69 g, 2.7 mmol) and a 1 M aqueous sodium hydroxide solution (10 mL). After 4 hours, add dimethylsulfate and heat to reflux. After 24 hours, cool to ambient temperature, acidify with 12 M hydrochloric acid solution and extract with ethyl acetate. Separate the organic layer, extract with brine, dry over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with ethyl acetate/hexane 2/1 to give methyl 2-methoxy-5-methylthiobenzoate. Elemental Analysis calculated for C9H12O3S: C, 54.53; H, 5.08. Found: C, 54.64; H, 4.95. | |
With hydrogenchloride; sodium hydroxide; sodium carbonate; sodium nitrite; In sodium sulfide; water; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.0 g, 5.6 mmol) and 12 M aqueous hydrochloric acid solution (1.2 g and cool in an ice bath. Add a solution of sodium nitrite (0.37 g, 5.3 mmol) in water (3 mL). After 1.5 hours, add ethyl xanthic acid, sodium salt (0.76 g, 6.3 mmol) and sodium carbonate (0.67 g, 6.3 mmol). After 2 hours, evaporate in vacuo and add sodium sulfide (0.69 g, 2.7 mmol) and a 1 M aqueous sodium hydroxide solution (10 mL). After 4 hours, add dimethylsulfate and heat to reflux. After 24 hours, cool to ambient temperature, acidify with 12 M hydrochloric acid solution and extract with ethyl acetate. Separate the organic layer, extract with brine, dry over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with ethyl acetate/hexane 2/1 to give methyl 2-methoxy-5-methylthiobenzoate. Elemental Analysis calculated for C9H12O3S: C, 54.53; H, 5.08. Found: C, 54.64; H, 4.95. | |
With hydrogenchloride; sodium hydroxide; sodium carbonate; sodium nitrite; In sodium sulfide; water; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.0 g, 5.6 mmol) and 12 M aqueous hydrochloric acid solution (1.2 g and cool in an ice bath. Add a solution of sodium nitrite (0.37-g, 5.3 mmol) in water (3 mL). After 1.5 hours, add ethyl xanthic acid, sodium salt (0.76 g, 6.3 mmol) and sodium carbonate (0.67 g, 6.3 mmol). After 2 hours, evaporate in vacuo and add sodium sulfide (0.69 g, 2.7 mmol) and a 1 M aqueous sodium hydroxide solution (10 mL). After 4 hours, add dimethylsulfate and heat to reflux. After 24 hours, cool to ambient temperature, acidify with 12 M hydrochloric acid solution and extract with ethyl acetate. Separate the organic layer, extract with brine, dry over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with ethyl acetate/hexane 2/1 to give methyl 2-methoxy-5-methylthiobenzoate. Elemental Analysis calculated for C9H12O3S: C, 54.53; H, 5.08. Found: C, 54.64; H, 4.95. |
With hydrogenchloride; sodium hydroxide; sodium carbonate; sodium nitrite; In sodium sulfide; water; | Alternately, combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.0 g, 5.6 mmol) and 12 M aqueous hydrochloric acid solution (1.2 g and cool in an ice bath. Add a solution of sodium nitrite (0.37 g, 5.3 mmol) in water (3 mL). After 1.5 hours, add ethyl xanthic acid, sodium salt (0.76 g, 6.3 mmol) and sodium carbonate (0.67 g, 6.3 mmol). After 2 hours, evaporate in vacuo and add sodium sulfide (0.69 g, 2.7 mmol) and a 1 M aqueous sodium hydroxide solution (10 mL). After 4 hours, add dimethylsulfate and heat to reflux. After 24 hours, cool to ambient temperature, acidify with 12 M hydrochloric acid solution and extract with ethyl acetate. Separate the organic layer, extract with brine, dry over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding with ethyl acetate/hexane 2/1 to give methyl 2-methoxy-5-methylthiobenzoate. Elemental Analysis calculated for C9H12O3S: C, 54.53; H, 5.08. Found: C, 54.64; H, 4.95. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
palladium-carbon; In methanol; ethyl acetate; | PREPARATION 59 2-Methoxy-5-(3-methylsulfanyl-[1,2,4]triazol-4-yl)-benzoic Acid Prepare 5-amino-2-methoxy-benzoic acid methyl ester by catalytic hydrogenation of 1-methoxy-5-nitrobenzoic acid methyl ester (103.2 g, 0.49 mole, Wychem) over 10%Pd/C (5 g) in methanol (3.1 liters) at 119 pounds per square inch pressure. After the uptake of hydrogen ceases, filter the mixture and concentrate the filtrate. Dissolve the residue in ethyl acetate (1 liter), wash with saturated brine solution, dry (MgSO4), filter and concentrate to afford 5-amino-2-methoxy-benzoic acid methyl ester. | |
palladium-carbon; In methanol; ethyl acetate; | PREPARATION 59 2-Methoxy-5-(3-methylsulfanyl-[1,2,4]triazol-4-yl)-benzoic acid Prepare 5-amino-2-methoxy-benzoic acid methyl ester by catalytic hydrogenation of 1-methoxy-5-nitrobenzoic acid methyl ester (103.2 g, 0.49 mole, Wychem) over 10%Pd/C (5 g) in methanol (3.1 liters) at 119 pounds per square inch pressure. After the uptake of hydrogen ceases, filter the mixture and concentrate the filtrate. Dissolve the residue in ethyl acetate (1 liter), wash with saturated brine solution, dry (MgSO4), filter and concentrate to afford 5-amino-2-methoxy-benzoic acid methyl ester. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In dichloromethane; | PREPARATION 32.1 2-Methoxy-5-(5-methylsulfonyl-1H-tetrazol-1-yl)benzoic Acid According to the method of Tet. Let., 26, 1661 (1985), combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (0.5 g, 2.76 mmol) and di-2-pyridyl thionocarbonate (0.64 g, 2.76 mmol) in dichloromethane (10 mL). After 30 minutes, dilute the reaction mixture with dichloromethane and extract five times with water. Dry the organic layer over Na2SO4, filter, and concentrate in vacuo to give methyl 2-methoxy-5-isothiocyanatobenzoate: Rf=0.51 (silica gel, dichloromethane). | |
In dichloromethane; | Treat a solution of 5-amino-2-methoxy-benzoic acid methyl ester (7.70 g, 42.5 mmol) and dichloromethane (50 mL) portionwise with a solution of di-2-pyridyl thionocarbonate (10.0 g, 43.1 mmol; Aldrich Chemical Company) and dichloromethane (70 mL) at room temperature under an argon atmosphere. After 3.5 hours, concentrate in vacuo and purify the residue by flash chromatography (silica gel, 5.5*17.8 cm) eluding with dichloromethane. Combine the appropriate fractions and concentrate to afford 5-isothiocyanato-2-methoxy-benzoic acid methyl ester (6,,9 g). | |
In dichloromethane; | PREPARATION 32.1 2-Methoxy-5-(5-methylsulfonyl-1H-tetrazol-1-yl)benzoic acid According to the method of Tet. Let., 26, 1661 (1985), combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (0.5 g, 2.76 mmol) and di-2-pyridyl thionocarbonate (0.64 g, 2.76 mmol) in dichloromethane (10 mL). After 30 minutes, dilute the reaction mixture with dichloromethane and extract five times with water. Dry the organic layer over Na2SO4, filter, and concentrate in vacuo to give methyl 2-methoxy-5-isothiocyanatobenzoate: Rf=0.51 (silica gel, dichloromethane). |
In dichloromethane; | Treat a solution of 5-amino-2-methoxy-benzoic acid methyl ester (7.70 g, 42.5 mmol) and dichloromethane (50 mL) portionwise with a solution of di-2-pyridyl thionocarbonate (10.0 g, 43.1 mmol; Aldrich Chemical Company) and dichloromethane (70 mL) at room temperature under an argon atmosphere. After 3.5 hours, concentrate in vacuo and purify the residue by flash chromatography (silica gel, 5.5*17.8 cm) eluding with dichloromethane. Combine the appropriate fractions and concentrate to afford 5-isothiocyanato-2-methoxy-benzoic acid methyl ester (6.9 g). | |
In dichloromethane; | Preparation 32.1 2-Methoxy-5-(5-methylsulfonyl-1H-tetrazol-1-yl)benzoic Acid According to the method of Tet. Let., 26, 1661 (1985), combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (0.5 g, 2.76 mmol) and di-2-pyridyl thionocarbonate (0.64 g, 2.76 mmol) in dichloromethane (10 mL). After 30 minutes, dilute the reaction mixture with dichloromethane and extract five times with water. Dry the organic layer over Na2SO4, filter, and concentrate in vacuo to give methyl 2-methoxy-5-isothiocyanatobenzoate: Rf=0.51 (silica gel, dichloromethane). | |
In dichloromethane; | PREPARATION 32 2-Methoxy-5-(5-methylsulfonyltetrazol-1-yl)benzoic acid According to the method of Tet. Let., 26, 1661 (1985), combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (0.5 g, 2.76 mmol) and di-2-pyridyl thionocarbonate (0.64 g, 2.76 mmol) in dichloromethane (10 mL). After 30 minutes, dilute the reaction mixture with dichloromethane and extract five times with water. Dry the organic layer over Na2SO4, filter, and concentrate in vacuo to give methyl 2-methoxy-5-thioisocyanatobenzoate: Rf=0.51 (silica gel, dichloromethane). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; trifluoroacetic anhydride; In tetrahydrofuran; water; | PREPARATION 17 2-Methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. | |
With pyridine; trifluoroacetic anhydride; In tetrahydrofuran; water; | Preparation 17 2-Methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic Acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran, (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. | |
With pyridine; trifluoroacetic anhydride; In tetrahydrofuran; water; | PREPARATION 17 2-Methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic Acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. |
With pyridine; trifluoroacetic anhydride; In tetrahydrofuran; water; | PREPARATION 18 Synthesis of 2-methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter; and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. | |
With pyridine; trifluoroacetic anhydride; In tetrahydrofuran; water; | PREPARATION 37 Synthesis of 2-methoxy-5-(5-trifluoromethyl-1H-tetrazol-1-yl)benzoic acid Combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol) and pyridine (0.88 mL, 11 mmol) in tetrahydrofuran (10 mL). Cool in an ice bath. Add trifluoroacetic anhydride (1.56 mL, 11 mmol). Warm to ambient temperature. After 2 hours, add water and dilute the reaction mixture with ethyl acetate. Separate the organic layer, extract with brine, dry over MgSO4, filter, and evaporate in vacuo to give methyl 2-methoxy-5-trifluoroacetylamidobenzoate. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With dmap; D2; In N,N-dimethyl-formamide; | EXAMPLE 1 2-Methoxy-5-[3-(2-methyl-[1,5]-naphthyridin-4-yl)ureido]benzoic Acid Methyl Ester D2 (0.51 g) was added in portions over 10 min to a solution of 1,1'-carbonyl diimidazole (0.536 g) and 4-N,N-dimethylaminopyridine (0.004 g) in DMF (10 ml). The resulting solution was stirred for 16 h, <strong>[22802-67-1]5-amino-2-methoxybenzoic acid methyl ester</strong> (0.577 g) added in DMF (2 ml) and the mixture heated at 100 C. for 2 h. The mixture was diluted with ethyl acetate and washed with water (*2) and brine, dried (Na2SO4) and solvent removed at reduced pressure. The pale pink solid was triturated with DCM to give the title compound (0.58 g). 1H NMR δ: 2.64 (3H, s), 3.34 (3H, s), 3.81 (3H, s), 7.15 (1H, d), 7.59 (1H, dd), 7.80 (1H, dd), 7.94 (1H, d), 8.29 (1H, dd), 8.34 (1H, s), 8.89 (1H, m), 9.85 (1H, s), 10.05 (1H, s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydrogencarbonate; In methanol; ethyl acetate; | Alternately, according to the method of J. Med. Chem., 21, 1100 (1978), combine <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (1.8 g, 10 mmol), diformyl hydrazines (0.97 g, 11 mmol), and phosphorous pentoxide (1.84 g, 13 mmol). Heat to 160 C. After 1.5 hours, cool the reaction mixture and add a saturated aqueous solution of sodium bicarbonate. Extract three times with dichloromethane. Dry the combined organic layers over MgSO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluding sequentially with 40% ethyl acetate/dichloromethane and then 5% methanol/dichloromethane to give methyl 2-methoxy-5-(4H-triazol-4-yl)benzoate: mp; 179-182 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With BF3-etherate; sodium sulfate; In dichloromethane; | Example 1 cis-4-Benzyloxycarbonylamino-6-methoxy-2-methyl-1,2,3,4-tetrahydro-quinoline-7-carboxylic acid methyl ester. To a solution of 4.26 g <strong>[22802-67-1]methyl 2-methoxy-5-aminobenzoate</strong> (23.5 mmol) in 65 ml anhydrous dichloromethane was added 3.34 g anhydrous sodium sulfate, and the resulting mixture was cooled to -25 C. Freshly distilled acetaldehyde (1.04 g, 23.5 mmol) was added and the mixture was stirred at -25 C. for 2 h. The supernatant was cannulated into a -25 C. solution of N-vinyl-O-benzyl carbamate (1.4 g, 7.8 mmol) in 10 ml dichloromethane. BF3-etherate (111 mg, 0.78 mmol) was added over 10 min, and the the reaction was stirred at -25 C. for 1.5 h. The reaction was quenched cold with the addition of an aqueous 10% sodium sulfate solution. The aqueous phase was separated and was extracted with dichloromethane (100 mL). The combined organic layers were dried (MgSO4), filtered and concentrated, and the crude material was purified by silica gel chromatography using dichloromethane to afford the title product (0.99 g). 1 H NMR (DMSO-d6) δ 1.13 (d, 3H), 6.58 (s, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
palladium; | Methyl 5-amino-2-methoxybenzoate may be prepared in a manner analogous to that described in Example 99 for the preparation of methyl (RS)-3-aminomandelate, but using 20 g of methyl 2-methoxy-5-nitrobenzoate and 0.5 g of 5% palladium-on-charcoal as the starting material. 17 g of methyl 5-amino-2-methoxybenzoate are thus obtained in the form of an oil which is used as such in the subsequent syntheses. Methyl 2-methoxy-5-nitrobenzoate may be prepared in the following way: |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
55% | In isopropyl alcohol; at 100℃; for 15h;Product distribution / selectivity; | Methyl 2-methoxy-5-nitro-benzoate (300 mg), ammonium chloride (228 mg), and zinc (929 mg) were suspended in ethanol (10 ml) and water (0.5 ml), and the suspension was stirred under reflux for 3 hr. The reaction mixture was filtered, and the solvent was removed from the filtrate by distillation under the reduced pressure. A saturated aqueous sodium hydrogencarbonate solution was added to the residue, and the mixture was extracted with chloroform. The chloroform layer was washed with water and saturated brine and was dried over anhydrous magnesium sulfate. The solvent was removed by distillation under the reduced pressure, and the residue was purified by column chromatography with an acetone-chloroform system to give methyl 5-amino-2-methoxy-benzoate (244 mg, yield 95%). Methyl 5-amino-2-methoxy-benzoate (244 mg) and 5-methoxymethylene-2,2-dimethyl-[1,3]dioxan-4,6-dione (228 mg) were dissolved in 2-propanol (3 ml), and the solution was stirred at 100C for 15 hr. The solvent was removed by distillation under the reduced pressure, and the residue was washed with diethyl ether to give methyl 5-[(2,2-dimethyl-4,6-dioxo-[1,3]dioxan-5-ylidenemethyl)-amino]-2-methoxy-benzoate (248 mg, yield 55%). |
In isopropyl alcohol; at 17 - 25℃; for 0.166667h; | A mixture of <strong>[22802-67-1]methyl 5-amino-2-methoxybenzoate</strong> (17 g; see also Canadian Journal of Chemistry, 1973, 5_i, 162-170), 5-methoxymethylene-2,2-dimethyl-l,3-dioxane-4,6-dione (17.5 g) and isopropanol (170 ml) was stirred at ambient temperature for 10 minutes. A yellow precipitate formed which was isolated by filtration, washed in turn with isopropanol and25 diethyl ether and dried under vacuum. There was thus obtained 5-(4-methoxy-3-methoxycarbonylanilmomethylene)-2,2-dimethyl-l,3-dioxane-4,6-dione (28.9 g); 1H NMR: (CDCl3) 1.76 (s, 6H), 3.93 (s, 3H), 3.95 (s, 3H), 7.05 (d, IH), 7.35 (m, IH), 7.74 (d, IH), 8.56 (d, IH); Mass Spectrum: M+H^ 336. | |
In isopropyl alcohol; at 20℃; for 0.166667h; | A mixture of <strong>[22802-67-1]methyl 5-amino-2-methoxybenzoate</strong> (17 g; see also Canadian Journal of Chemistry, 1973, 51, 162-170), 5-methoxymethylene-2,2-dimethyl-1,3-dioxane-4,6-dione (17.5 g) and isopropanol (200 ml) was stirred at ambient temperature for 10 minutes. A yellow precipitate formed which was isolated by filtration, washed in turn with isopropanol and diethyl ether and dried under vacuum. There was thus obtained 5-(4-methoxy-3-methoxycarbonylanilinomethylene)-2,2-dimethyl-1,3-dioxane-4,6-dione (28.9 g); 1H NMR: (CDCl3) 1.76 (s, 6H), 3.93 (s, 3H), 3.95 (s, 3H), 7.05 (d, 1H), 7.35 (m, 1H), 7.74 (d, 1H), 8.56 (d, 1H); Mass Spectrum: M+H+ 336. |
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