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CAS No. : | 31555-59-6 | MDL No. : | MFCD00130092 |
Formula : | C6H5ClOS | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | DJCGIWVUKCNCAT-UHFFFAOYSA-N |
M.W : | 160.62 | Pubchem ID : | 2760083 |
Synonyms : |
|
Num. heavy atoms : | 9 |
Num. arom. heavy atoms : | 5 |
Fraction Csp3 : | 0.17 |
Num. rotatable bonds : | 1 |
Num. H-bond acceptors : | 1.0 |
Num. H-bond donors : | 0.0 |
Molar Refractivity : | 39.47 |
TPSA : | 45.31 Ų |
GI absorption : | High |
BBB permeant : | Yes |
P-gp substrate : | No |
CYP1A2 inhibitor : | Yes |
CYP2C19 inhibitor : | No |
CYP2C9 inhibitor : | No |
CYP2D6 inhibitor : | No |
CYP3A4 inhibitor : | No |
Log Kp (skin permeation) : | -5.26 cm/s |
Log Po/w (iLOGP) : | 1.93 |
Log Po/w (XLOGP3) : | 2.85 |
Log Po/w (WLOGP) : | 2.44 |
Log Po/w (MLOGP) : | 1.37 |
Log Po/w (SILICOS-IT) : | 3.46 |
Consensus Log Po/w : | 2.41 |
Lipinski : | 0.0 |
Ghose : | None |
Veber : | 0.0 |
Egan : | 0.0 |
Muegge : | 1.0 |
Bioavailability Score : | 0.55 |
Log S (ESOL) : | -2.98 |
Solubility : | 0.17 mg/ml ; 0.00106 mol/l |
Class : | Soluble |
Log S (Ali) : | -3.46 |
Solubility : | 0.0557 mg/ml ; 0.000347 mol/l |
Class : | Soluble |
Log S (SILICOS-IT) : | -2.61 |
Solubility : | 0.397 mg/ml ; 0.00247 mol/l |
Class : | Soluble |
PAINS : | 0.0 alert |
Brenk : | 1.0 alert |
Leadlikeness : | 1.0 |
Synthetic accessibility : | 2.17 |
Signal Word: | Danger | Class: | 8 |
Precautionary Statements: | P233-P260-P261-P264-P271-P280-P301+P330+P331-P302+P352-P303+P361+P353-P304-P304+P340-P305+P351+P338-P310-P312-P321-P332+P313-P337+P313-P340-P362-P363-P403-P403+P233-P405-P501 | UN#: | 1760 |
Hazard Statements: | H314-H315-H319-H335 | Packing Group: | Ⅱ |
GHS Pictogram: |
* 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 |
---|---|---|
With pyridine; In dichloromethane; at 20℃; for 18h; | 5-Methylthiophene-2-carboxylic acid (2,4-diphenylthiazol-5-yl)amide (1 r).5-Methylthiophene-2-carboxylic acid (213 mg, 1 .50 mmol) was suspended in DCM (5.0 mL) then oxalyl chloride (131 muL, 1 .50 mmol) and DMF-DCM (1 :9, 20 muL) was added. After stirring at ambient temperature for 1 h, a solution of 2,4-diphenyl-5-aminothiazole (252 mg, 1 .00 mmol) in pyridine (5.0 mL) was added and stirring of the resultant mixture continued at ambient temperature for 18 hours. The reaction mixture was diluted with DCM (60 mL) and washed successively with 1 M HCI (4 x 40 mL) and sat. NaHCO3 (2 x 40 mL). The organic layer was dried over MgSO4, filtered and evaporated giving crude material, which was purified by flash column chromatography on silica gel, eluted with 60-75% DCM-hexane, yielding 1 r as an off-white solid (252 mg, 67%). mp 1900 C; m/z (El), 376 (M+); HRMS, found 376.0695 (C21 H16N2OS2, M+, requires 376.0704). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Proceeding as described in Example 1, Steps 1-4 above but substituting L-Boc-valine in Step 3 with L-Boc-tert-leucine (commercially available from Fluka) gave 1-(S)-[4-(3,4-dichlorobenzyl)piperazin-1-ylcarbonyl]-2,2-dimethylpropylamine which was reduced to 1-(S)-[4-(3,4-dichloro-benzyl)piperazin-1-ylmethyl]-2,2-methylpropylamine (Step 5) and then reacted with: 4-Methylsulfonylbenzoyl chloride; 4-Acetoxybenzoyl chloride; 4-N,N-Dimethylaminobenzoyl chloride; 5-Methyl-2-thenoyl chloride; and 4-Methylbenzoyl chloride, to give N-{1(S)-[4-(3,4-Dichlorobenzyl)piperazin-1-ylmethyl]-2,2-dimethylpropyl}-4-methylsulfonylbenzamide dihydrochloride salt, mp 190-191 C.; N-{1(S)-[4-(3,4-Dichlorobenzyl)piperazin-1-ylmethyl]-2,2-dimethylpropyl}-4-acetoxybenzamide dihydrochloride salt, mp 241-242 C.; N-{1(S)-[4-(3,4-Dichlorobenzyl)piperazin-1-ylmethyl]-2,2-dimethylpropyl}-4-N,N-dimethylaminobenzamide dihydrochloride salt, mp 101.5-105 C.; N-{1(S)-[4-(3,4-Dichlorobenzyl)piperazin-1-ylmethyl]-2,2-dimethylpropyl}-5-methyl-2-thiophenecarboxamide dihydrochloride salt, mp 249-253 C.; and N-{1(S)-[4-(3,4-Dichlorobenzyl)piperazin-1-ylmethyl]-2,2-dimethylpropyl}-4-methylbenzamide dihydrochloride salt by following the procedure described in Steps 5 and 6 above. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In acetonitrile;Heating / reflux; | To a solution of 200 mg (0. 5 mmol) of 4- (4-amino-quinazolin-6-yl)-3-pyridin- 2-YL-PYRAZOLE-1-SULFONIC acid dimethylamide (which is prepared by coupling 6-iodo-4- aminoquinazoline (the title compound of Example G above) with 1- (NN-DIMETHYL)- sulfamoyl-3-pyridin-2-yl-pyrazole-4-boronic acid (the title compound of Example 1 (d) above) in the same manner as described in Example L (e) above) in 10 mL CH3CN was added 0. 28 ML (2. 0 mmol) triethylamine, then 97 mg (0. 6 mmol) 5-methylthiophene-2- carbonyl chloride (Oakwood Products, Inc., West Columbia, SC) with stirring to give a yellow solution. This was heated to reflux overnight, then cooled, diluted with ethyl acetate, washed with IN NAOH, then a 5% solution of citric acid, then brine. The organic phase was dried, filtered and concentrated to form 5-methyl-thiophene-2- carboxylic acid [6-(1-DIMETHYLSULFAMOYL-3-PYRIDIN-2-YL-LH-PYRAZOL-4-YL)-QUINAZOLIN-4- yl]-amide, a yellow solid, which was used in the next step without further purification ; m/z : 520 [M+H] +. 5-Methyl-thiophene-2-carboxylic acid [6- (1-dimethylsulfamoyl-3-pyridin-2-yl- LH-PYRAZOL-4-YL)-QUINAZOLIN-4-YL]-AMIDE was then deprotected in the same manner as described in Example 2 to produce the title COMPOUND. 1H-NMR (300 MHz, DMSO- d6, 8) : 8. 56 (s, 1H), 8. 67 (dd, J= 2 Hz, 4 Hz, 1H), 8. 25 (d, J= 2 Hz, 1H), 8. 15 (s, 1H), 8. 01 (m, 1H), 7. 99 (m, 1H), 7. 92 (d, J= 8 Hz, 1H), 7. 86 (d, J= 8 Hz, 1H), 7. 76 (d, J= 2 Hz, 1H), 7. 55 (t, J= 8 Hz, 1H), 7. 40 (d, J= 8 Hz, 1H), 6. 90 (m, 1H), 2. 50 (s, 3H) ; m/z : 413 [M+H] +. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 20℃; | Step A:; To an ice-cold suspension of 5-methyl-2-thiophenecaboxylic acid (304 mg, 2.14 mmol) in dichloromethane (10 mL) was added oxalyl chloride (0.18 mL, 2.14 mmol) dropwise. Then the ice-water bath was removed and the mixture was stirred for 1 h. To the above solution was added 2-amino-3-hydroxybenzoic acid hydrobromide (0.50 g, 2.14 mmol) followed by triethylamine (1.20 mL, 8.56 mmol). The resulting reaction mixture was stirred at room temperature overnight. The reaction was quenched with water (50 mL). The reaction mixture was extracted with dichloromethane. The aqueous layer was extracted with dichloromethane (2×50 mL). The combined organic layers were dried over Na2SO4, filtered and concentrated to afford a yellow solid. The crude was dissolved in toluene (5 mL) and the solution was treated with p-toluenesulfonic acid monohydrate (464 mg, 2.44 mmol). The reaction mixture was then heated at 95 C. under nitrogen for 5 h. The reaction was cooled down to room temperature, poured into water and extracted with dichloromethane. The organic layer was separated, washed with water, brine, dried over Na2SO4, filtered and concentrated to a yellow solid. The crude material was purified by recrystallization from methanol to afford the desired product (111 mg, 26%) as an off-white solid: 1H NMR (500 MHz, DMSO-d6) delta 7.83-7.80 (m, 1H), 7.75-7.70 (m, 2H), 7.58-7.55 (m, 1H), 7.37-7.32 (m, 1H), MS (ESI+) m/z 260 (M+H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 20℃; | Step A:; To an ice-cold suspension of 5-methyl-2-thiophenecarboxyl acid (400 mg, 2.14 mmol) in dichloromethane (20 mL) was added oxalyl chloride (0.21 mL, 2.14 mmol) dropwise followed by a few drops of DMF. Then the ice-water bath was removed and the reaction mixture was stirred for 1 h. To the above solution was added 2-amino-3-hydroxybenzoic acid hydrobromide (0.50 g, 2.14 mmol) followed by triethylamine (1.19 mL, 8.56 mmol). The resulting reaction mixture was stirred at room temperature overnight. The reaction was quenched with 1 N HCl (20 mL). The reaction mixture was extracted with dichloromethane. The aqueous layer was extracted with dichloromethane (2×50 mL). The combined organic layers were dried over Na2SO4, filtered and concentrated to afford a yellow solid. The crude was dissolved in toluene (5 mL) and the solution was treated with p-toluenesulfonic acid monohydrate (619 mg, 3.25 mmol). The reaction mixture was then heated to reflux under nitrogen for 3 h. The reaction was cooled down to room temperature, poured into water and extracted with dichloromethane. The organic layer was separated, washed with water, brine, dried over Na2SO4, filtered and concentrated to a yellow solid. The crude material was recrystallized from methanol to afford the desired product (198 mg, 48%) as an off-white solid (78 mg, 12%): 1H NMR (500 MHz, DMSO-d6) delta 8.20 (d, J=2.1 Hz, 1H), 7.84 (d, J=3.7 Hz, 1H), 7.83 (d, J=2.2 Hz, 1H), 7.06 (dd, J=3.7, 1.1 Hz, 1H), 3.17 (s, 3H), MS (ESI+) m/z 293 (M+H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
74% | EXAMPLE 5 5-Methyl-thiophene-2-carboxylic acid (4.6-difluoro-benzothiazol-2-yl)-amide Using <strong>[119256-40-5]2-amino-4,6-difluoro-benzothiazole</strong> and 5-methyl-thiophene-carboxylicacid chloride the title compound was prepared as a yellow solid (74% yield), MS: m/e=310 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
53% | In pyridine; | EXAMPLE 40 5-Methyl-thiophene-2-carboxylic acid (4-methoxy-7-morpholin-4-ylmethyl-benzothiazol-2-yl)-amide Using 4-methoxy-7-morpholin-4-ylmethyl-benzothiazol-2-ylamine and 5-methyl-thiophene-2-carboxylic acid chloride in pyridine the title compound was obtained as a yellow solid (53% yield), MS: m/e=404.4 (M+H+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ammonium hydroxide; sodium hydroxide; triethylamine; In dichloromethane; | EXAMPLE 66 5-Methyl-thiophene-2-carboxylic acid (5-methoxy-7-phenyl-benzothiazol-2-yl)-amide 2-Amino-5-methoxy-7-phenylbenzothiazol (45 mg, 0.18 mmol) is dissolved in dichloromethane (2 ml) and subsequently treated with triethylamine (0.073 ml, 0.53 mmol) and 5-methyl-thiophene-2-carbonyl chloride (56 mg, 0.35 mmol). After 6 h, further 0.073 ml, 0.53 mmol) and 5-methyl-thiophene-2-carbonyl chloride (56 mg, 0.35 mmol) are added and the mixture is stirred for additional 18 h at ambient. After addition of 0.1M aqueous sodium hydroxide, the mixture is stirred for additional 16 h. The organic layer is separated, dried and evaporated to dryness. Flash chromatography (silica, eluent ethyl acetate/cyclohexane 1:1, containing 0.5% of 25% aqueous ammonia) affords (10 mg, 5%) of the product as white solid. MS: m/e=380 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; In dichloromethane; | EXAMPLE 69 5-Methyl-thiophene-2-carboxylic acid (7-bromo-4-methoxy-benzothiazol-2-yl)-amide 2-Amino-7-bromo-4-methoxybenzothiazol (2.33 g, 9 mmol) is dissolved in dichloromethane (100 ml) and at 0 C. treated with pyridine (2.2 ml, 27 mmol) and 5-methyl-thiophene-2-carbonyl chloride (2.2 g, 13.5 mmol). The reaction mixture is allowed to warm to room temperature and after stirring for additional 18 h quenched with water (100 ml). After separation of the phases, the aqueous phases are extracted twice with ethyl acetate. The combined organic layers are then washed with brine, dried and avaporated to dryness. Flash chromatography on silica (eluent ethyl acetate/cyclohexane 1:1 to 4:1) and final recrystallization from ethyl acetate affords the product as off-white solid. (34 mg, 69%). MS: m/e=384 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69% | With dmap; ammonium hydroxide; In pyridine; | EXAMPLE 70 5 -Methyl-thiophene-2-carboxylic acid (4-fluoro-benzothiazol-2-yl)-amide <strong>[20358-06-9]2-Amino-4-flourobenzothiazol</strong> (84 mg, 0.50 mmol) is dissolved in pyridine (3 ml) and treated with 4-dimethylaminopyridine (1 mg) and 5-methyl-thiophene-2-carbonyl chloride (161 mg, 1.0 mmol). After stirring for 1 h at ambient temperature, the reaction mixture was evaporated to dryness. Flash chromatography on silica (eluent diethyl ether/cyclohexane 1:1 containing 0.5% of 25% aqueous ammonia) and final recrystallization from ethyl acetate affords the product as off-white solid.(34 mg, 69 %). MS: m/e=292 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
39% | With dmap; In pyridine; | EXAMPLE 71 5-Methyl-thiophene-2-carboxylic acid (4-trifluoromethoxy-benzothiazol-2-yl)-amide 2-amino-4-triflouromethoxybenzothiazol (70 mg, 0.30 mmol) is dissolved in pyridine (3 ml) and treated with 4-dimethylaminopyridine (1 mg) and 5-methyl-thiophene-2-carbonyl chloride (96 mg, 0.60 mmol). After stirring for 4 h at ambient temperature, the reaction mixture was evaporated to dryness. Flash chromatography on silica (eluent ethyl acetate/cyclohexane 1:2) affords the product as white solid. (42 mg, 39% yield). MS: m/e=358 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
57% | With pyridine; In dichloromethane; ethyl acetate; | EXAMPLE 68 5-Methyl-thiophene-2-carboxylic acid (4-chloro-benzothiazol-2-yl)-amide 2-Amino-4-chlorobenzothiazol (92 mg, 0.50 mmol) is dissolved in dichloromethane (10 ml) and treated with pyridine (0.060 ml, 0.75 mmol) and 5-methyl-thiophene-2-carbonyl chloride (97 mg, 0.60 mmol). The reaction mixture is stirred at ambient temperature for 18 h and then evaporated to dryness. The residue is redissolved in ethyl acetate and water, the phases are separated and the organic layer extracted with brine. After dryin with sodium silfate, the solvent is removed in vacuo Flash chromatography on silica (eluent ethyl acetate/cyclohexane 1:4 affords the product as white solid.(88 mg, 57%). MS: m/e=308 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | In pyridine; | EXAMPLE 9 5-Methyl-thiophene-2-carboxylic acid (4-methoxy-benzothiazol-2-yl)-amide Using <strong>[5464-79-9]2-amino-4-methoxy-benzothiazole</strong> and 5-methyl-thiophene-2-carboxylic acid chloride in pyridine the title compound was obtained as a beige solid (95% yield), MS: m/e=304.1 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76% | EXAMPLE 38 5-Methyl-thiophene-2-carboxylic acid (4-methoxy-7-phenoxy-benzothiazol-2-yl)-amide Using 4-methoxy-7-phenoxy-benzothiazol-2-ylamine and 5-methyl-thiophene-2-carboxylic acid chloride the title compound was obtained crude, which was chromatographed over SiO2 (Merck 230-400 mesh) eluding with CH2Cl2/EtOAc (1:1), to afford the pure title compound as a pale yellow solid (76% yield), MS: m/e=396.0 (M+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
h trans-4-[4-(3-hydroxypropyl)methylaminomethylphenyl]-N-methyl-N-(5-methylthienyl-2-carbonyl)cyclohexylamine from trans-4-[4-(3-hydroxypropyl)methylaminomethylphenyl]-N-methylcyclohexylamine and <strong>[31555-59-6]5-methylthiophene-2-carboxylic acid chloride</strong>. Melting point: 85-87 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
EXAMPLE 60 5-(N-[5-methyl-2-thiophenecarbonyl]amino)-3-(1-methylpiperidin-4-yl)pyrrolo[3,2-b]pyridine Beginning with 0.40 gm (1.74 mMol) 5-amino-3-(1-methylpiperidin-4-yl)pyrrolo[3,2-b]pyridine and 0.34 gm (2.08 mMol) <strong>[31555-59-6]5-methyl-2-thiophenecarbonyl chloride</strong>, 0.53 gm (86%) of the title compound were prepared essentially by the procedure described in Example 4. m.p.=123.2-127.4 C. MS(m/e): 355(M+1) Calculated for C19 H22 N4 OS: Theory: C, 64.38; H, 6.26; N, 15.81. Found: C, 64.17; H, 6.17; N, 15.61. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In tetrahydrofuran; ethanol; water; | PREPARATION 42 N-[3-[(5-Methyl-2-thienylcarbonyl)amino]-2-pyridinyl]glycine ethyl ester Under a nitrogen atmosphere, triethylamine (31.41 g, 0.311 mole) and <strong>[31555-59-6]5-methyl-2-thiophenecarbonyl chloride</strong> (50 g, 0.311 mole) were added simultaneously, dropwise, to a stirred and chilled solution of freshly prepared N-[[3-amino]-2-pyridinyl]glycine ethyl ester (0.296 mole) by palladium/carbon reduction of N-[[3-nitro]-2-pyridinyl]glycine ethyl ester (66.98 g, 0.296 mole) in dry tetrahydrofuran (~1 liter). The reaction mixture was stirred at room temperature overnight and the solvent was evaporated under reduced pressure. The residue was partitioned between water and ethyl acetate, the layers separated and the aqueous layer was again extracted with ethyl acetate. The combined organic layers were washed twice with a 5% potassium hydroxide solution, twice with a saturated sodium bicarbonate solution, twice with water, dried over magnesium sulfate, treated with charcoal, filtered, and evaporated under reduced pressure to give 95.3 g of a tan solid in quantitative yield. A 1.5-g portion of the solid was dissolved in hot absolute ethanol, filtered while hot, and brought to its cloud point by addition of water. Cooling to room temperature gave a solid which was collected by filtration, rinsed with water, and dried under high vacuum at room temperature overnight to give 1.11 g of title compound, mp 112-115 C. Analysis: Calculated for C15 H17 N3 O3 S: C, 56.41; H, 5.36; N, 13.16; Found: C, 56.58; H, 5.36; N, 13.02 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In pyridine; water; N,N-dimethyl-formamide; | EXAMPLE 8 To a stirred suspension of 0.636 g. of 4-carbamoylimidazolium-5-olate in 15 ml of dry pyridine was added 0.883 g. of 5-methyl-2-thiophenecarbonyl chloride at a temperature below 5 C. in N2 atmosphere. After being stirred for two hours at 41-43 C., the reaction mixture was cooled to room temperature and then separated crystals were filtered off and dried to give 1.44 g. of white crystals. Recrystallized was 0.815 g. of crude material from N,N-dimethylformamide and water to give 0.513 g. of 5-carbamoyl-1H-imidazole-4-yl 5'-methylthiophene-2'-carboxylate, m.p. 189.5 C. (charred). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine;dmap; In dichloromethane; at 0℃; for 14h; | 5-Methyl-thiophene-2-carboxylic acid (25.00 g, 0.18 mol) was dissolved in benzene (150 mL), and sulfonyl chloride (30.00 mL, 0.41 mol) was added. The resulting reaction mixture was refluxed for 4 hours, then concentrated to afford the crude acid chloride. This crude acid chloride was then mixed in dichloromethane with N,O-dimethyl-hydroxylamine (1.3 eq) and a catalytic amount of DMAP and cooled to 0 C. Et3N (4.0 eq) was added. The resulting mixture was stirred for 14 hours. Water was added to the reaction mixture, and the resulting mixture was extracted with EtOAc (3×200 mL). The combined organic extracts were washed with H2O (2×200 mL) and brine (1×200 mL), then dried over MgSO4 and concentrated to give the desired Weinreb's amide. This amide was then dissolved in THF at 0 C. and 3-methylphenylmagnesium bromide (1.5 eq) was added. The resulting mixture was stirred for 3 hours. It was quenched with 5% HCl and extracted with Et2O (3×200 mL). The combined organic extracts were washed with H2O (2×200 mL) and brine (1×200 mL), then dried over MgSO4 and concentrated to give the crude ketone. The pure title ketone was obtained from column chromatography using hex:EtOAc (10:1) as the eluant. Spectroscopic data: 1H NMR (300 MHz, DMSO-d6) delta ppm 2.38 (s, 3H) 2.54 (s, 3H) 6.91-7.05 (m, 1H) 7.06-7.29 (m, 1H) 7.37-7.49 (m, 2H) 7.50-7.68 (m, 2H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To a stirred solution of oxalyl chloride (2M solution in dichloromethane, 15 mL) was added 5-methylthiophene-2-carboxylic acid (2.8 g) in one lot followed by a drop of DMF. The reaction was continuously stirred at room temperature for 4 h and concentrated in vacuo. The residue was dissolved in toluene (20 mL) and the solvent removed to afford <strong>[31555-59-6]5-methylthiophene-2-carbonyl chloride</strong>, which was used in the subsequent step without purification. To a stirred mixture of TMSCH2N2 (15 mL of 2M solution in hexanes) and triethylamine (3.5 mL) in THF (30 mL) and acetonitrile (30 mL) at 0 C. was added <strong>[31555-59-6]5-methylthiophene-2-carbonyl chloride</strong>, which was stirred continuously at 0 C. for 30 h. The reaction mixture was concentrated in vacuo. Benzyl alcohol (10 mL) and 2,4,6-trimethylpyridine (10 mL) were added to the evaporated residue and the mixture was stirred at 180-185 C. for 10 minutes. The reaction mixture was cooled to room temperature, diluted with ether and washed successively with 10% aqueous citric acid, water and saturated aqueous sodium chloride. The organic layer was dried over MgSO4 and concentrated in vacuo. The residue was dissolved in 15 mL of 2M solution potassium hydroxide in methanol, stirred at room temperature for 18 h and concentrated in vacuo. The residue was suspended in water and the aqueous layer extracted with ether, and the organic layer discarded. The aqueous layer was acidified to pH 34 with 6N hydrochloric acid, then extracted with ether to obtain (5-methylthiophen-2-yl)acetic acid (1.8 g, 62% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85.6% | With triethylamine; In toluene; at 20℃; for 48h; | General procedure: Into separate solutions of acid chlorides (2a-f, 5a-c) in 150 mL dry toluene at room temperature were added 2,3,4-substituted-6-amino acetophenones (1a-c) refPreviewPlaceHolder[14], refPreviewPlaceHolder[26] and refPreviewPlaceHolder[27] (1.1 equiv). The reaction mixtures were stirred and then triethylamine (3 mL) was added dropwise. The mixtures were stirred at room temperature for 48 h and then evaporated. The residues were isolated by chromatography, and then recrystallization gave the pure carboxamides. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
70% | General procedure: In a 25 mL flask, t-BuLi (2 mmol, 1.6 M in pentane) was added dropwise at -78 C to a stirred solution of 3-ethynylbenzo[b]thiophene (1 mmol, 158 mg) in Et2O (5 mL) and the reaction mixture was allowed to warm to room temperature. After stirring at room temperature for 1 h, S8 (0.25 mmol, 64 mg) was added and the reaction was stirred at room temperature for 2 h. The solvent of the reaction mixture was evaporated under vacuum and THF (5 mL) was added. After that, acid chloride (2 mmol) was added dropwise at room temperature. After stirring at room temperature for 1 h, the solvent of the reaction mixture was evaporated under vacuum. The residue was purified by chromatography to give products 2a-l. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With pyridine; at 20℃; | General procedure: The corresponding acid chloride (1.05 mmol) was added to nitrile 4 (1 mmol) in pyridine (1.5 mL). After stirring at rt, the mixture was poured into water. The precipitate that formed was washed with water, dried, and if required, crystallized from ethanol |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ammonium hydroxide; In tetrahydrofuran; at 20℃; for 2h; | General procedure: To a solution of an appropriate substituted carboxylic acid (10 mmol) in CHCl3 (50 mL) was added thionyl chloride (3.6 mL, 50 mmol), dropwise over 10 min. The resulting solution was refluxed for 8 h and then concentrated in vacuo. The residual light brown oil was dissolved in THF (50 mL), diluted with a solution of 30% NH4OH (6 mL), and stirred at room temperature for an additional 2 h. At that point, saturated aqueous NaHCO3 (10 mL) was added and the reaction mixture was extracted with EtOAc (3 × 30 mL). The combined organic layer was washed with brine (50 mL), dried over anhydrous Na2SO4, and concentrated in vacuo. The crude amide was carried directly to the next step without further purification. |
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