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CAS No. : | 36216-80-5 | MDL No. : | MFCD03407353 |
Formula : | C7H6N2O | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | NLMVYUBGWZWUGB-UHFFFAOYSA-N |
M.W : | 134.14 | Pubchem ID : | 2779749 |
Synonyms : |
|
Num. heavy atoms : | 10 |
Num. arom. heavy atoms : | 9 |
Fraction Csp3 : | 0.0 |
Num. rotatable bonds : | 0 |
Num. H-bond acceptors : | 2.0 |
Num. H-bond donors : | 1.0 |
Molar Refractivity : | 38.41 |
TPSA : | 52.05 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) : | -6.15 cm/s |
Log Po/w (iLOGP) : | 1.4 |
Log Po/w (XLOGP3) : | 1.36 |
Log Po/w (WLOGP) : | 1.42 |
Log Po/w (MLOGP) : | 1.18 |
Log Po/w (SILICOS-IT) : | 1.23 |
Consensus Log Po/w : | 1.32 |
Lipinski : | 0.0 |
Ghose : | None |
Veber : | 0.0 |
Egan : | 0.0 |
Muegge : | 1.0 |
Bioavailability Score : | 0.55 |
Log S (ESOL) : | -2.19 |
Solubility : | 0.857 mg/ml ; 0.00639 mol/l |
Class : | Soluble |
Log S (Ali) : | -2.06 |
Solubility : | 1.18 mg/ml ; 0.0088 mol/l |
Class : | Soluble |
Log S (SILICOS-IT) : | -2.52 |
Solubility : | 0.403 mg/ml ; 0.00301 mol/l |
Class : | Soluble |
PAINS : | 0.0 alert |
Brenk : | 0.0 alert |
Leadlikeness : | 1.0 |
Synthetic accessibility : | 2.37 |
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
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 |
---|---|---|
27% | With potassium <i>tert</i>-butylate; acide acetohydroxamique In N,N-dimethyl-formamide at 20℃; for 5.5 h; | Example 1; N-1,2-Benzisoxazol-3-yl-4-(3-phenyl-1,2,4-thiadiazol-5-yl)piperazine-1-carboxamide; (1) 1,2-Benzisoxazol-3-amine; To a solution of acetohydroxamic acid (10.0 g, 133 mmol) in N,N-dimethylformamide (150 ml) was added potassium tert-butoxide (14.9 g, 133 mmol), and the mixture was stirred at room temperature for 30 minutes. 2-Fluorobenzonitrile (18.0 g, 133 mmol) was added thereto, followed by stirring at room temperature for 5 hours. The reaction mixture was poured to water and extracted with ethyl acetate. The extract wase washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was recrystallized from hexane to give 4.80 g (27.0percent) of the desired product as a solid. 1H-NMR (CDCl3) δ; 4.43 (2H, br s), 7.23 - 7.28 (1H, m), 7.43 (1H, d, J = 9.3 Hz), 7.50 - 7.56 (2H, m). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
53.7% | With potassium carbonate In N,N-dimethyl-formamide at 80℃; | 2- fluorobenzonitrile (6.1g, 50.0mmol), acetohydroxamic acid (5.6g, 75.0mmol) and potassium carbonate (10.4g, 75mmol) was dissolved in DMF (40mL), the mixture was stirred overnight and heated to 80 .With ethyl acetate (100mL × 2) and extracted.The combined organic phases were washed with water (100 mL × 2), saturated brine (100 mL), dried over anhydrous sodium sulfate.Filtered, and the solvent was evaporated under reduced pressure and the crude product purified by column chromatography (petroleum ether / ethyl acetate (v / v) = 4/1), as a white solid (3.6g, 53.7percent). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrogenchloride; In ethanol; water; at 80℃; for 3h; | (Synthesis of X-3) A three-neck flack was charged with the entire amount of the crude product of Compound (X-2) obtained above and after adding 700 mL of ethanol and 500 mL of aqueous 1 mol/L hydrochloric acid, the reaction mixture was heated to an inner temperature of 80C and stirred at this temperature for 3 hours. The reaction mixture was cooled to an inner temperature of 25C and then subjected to an extraction and separation operation with an aqueous saturated sodium hydrogencarbonate solution and ethyl acetate, and the obtained organic phase was washed by adding saturated brine and separated. The thus-obtained organic phase was concentrated in a rotary evaporator to yield a residue as a crude product of Compound (X-3). | |
With hydrogenchloride; water; In ethanol; | Compound a-4 was prepared according to the procedures outlined in J. Heterocyclic Chem. , 26,1293-1298 (1989). | |
Example 19.1: Preparation of 2-Hydroxy-l-oxo-l//-9-oxa-4,9alpha-diaza-fluorene-3- carboxylic acid methyl esterOExample 5 , CVvV <n="122"/>For Step 1 and Step 2, the procedure described in J Heterocyclic Chem., 1989, 26, 1293 was adapted to afford 3-amino-benzoisoxazole. The procedure described in Example 5 was adapted to afford the desired ester.1H NMR (300 MHz, D6-DMS0) delta 3.90 (s, 3H), 7.52-7.62 (m, IH), 7.80-7.90 (m, 2H), 8.12 (d, J=7.8 Hz, IH), 10.92 (s, IH).MS (ESI+) m/z 283 (M+Na). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
53.7% | With potassium carbonate; In N,N-dimethyl-formamide; at 80℃; | 2- fluorobenzonitrile (6.1g, 50.0mmol), acetohydroxamic acid (5.6g, 75.0mmol) and potassium carbonate (10.4g, 75mmol) was dissolved in DMF (40mL), the mixture was stirred overnight and heated to 80 .With ethyl acetate (100mL × 2) and extracted.The combined organic phases were washed with water (100 mL × 2), saturated brine (100 mL), dried over anhydrous sodium sulfate.Filtered, and the solvent was evaporated under reduced pressure and the crude product purified by column chromatography (petroleum ether / ethyl acetate (v / v) = 4/1), as a white solid (3.6g, 53.7%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Part C. Preparation of 1-(3-amino-1,2-benzisoxazol-5-yl)-6-(2'-bromomethyl}-1,1'-biphenyl-4-yl)-3-(trifluoromethyl)-1,4,5,6-tetrahydro-7H-pryazolo[3,4-c]pyridin-7-one To the aldehyde from Part B (2 g, 0.3.8 mmol) in 2:1 THF/MeOH (50 mL) at 0 C. was added NaBH4 (0.17 g, 0.46 mmol) and the reaction was stirred 30 min. The reaction was concentrated and partitioned between CH2Cl2/H2O. The organic layer was washed with brine and dried (MgSO4) to afford crude alcohol. To acetohydroxamic acid (0.89 g, 11.9 mmol) in DMF (5 mL) was added K2CO3 (2.139 g, 15.9 mmol) and several drops of water. After 30 min the above alcohol in DMF (15 mL) was added and the reaction was stirred 24 h. The reaction was concentrated, diluted with water and extracted with ethyl acetate, washed with water and brine and dried (MgSO4) to afford the crude aminobenzisoxazole. | ||
EXAMPLE 33 3-AMINOBENZISOXAZOLE 2-Hydroxy-O-carboethoxybenzamide oxime (1.5 grams) was heated to 135-140 C. under reduced pressure (5 mm.) and maintained at that temperature until the evolution of gas ceased (about 10 minutes). After cooling, ether was added and then the reaction mixture was filtered and chromatographed (ether-silica gel column chromatography). The material with the highest Rf value was a white solid which was identified by NMR and IR as the desired product, yield 500 mg. | ||
EXAMPLE 26 3-AMINOBENZISOXAZOLE 2-Hydroxy-O-carboethoxybenzamide oxime (1.5 grams) was heated to 135-140 C. under reduced pressure (5 mm.) and maintained at that temperature until the evolution of gas ceased (about 10 minutes). After cooling, ether was added and then the reaction mixture was filtered and chromatographed (ether-silica gel column chromatography). The material with the highest Rf value was a white solid which was identified by NMR and IR as the desired product, yield 500 mg. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
5% | In tetrahydrofuran; di-isopropyl ether; at 20℃; | To a solution of intermediate 3 (0.0025 mol) in isopropylether (5 ml) THF (1 ml) was added and the reaction mixture stirred at RT. Phenylisocyanaat (0.0050 mol) was added and the reaction mixture stirred overnight at RT. The precipitate was filtered off, washed with isopropylether and evaporated dried. The residue was further purified over reversed phase HPLC on a Xterra MS C18 column (3'. 5 Rm, 4.6 x 100 mm) with a flow rate of 1.6 ml/min (Elution conditions: three mobile phases (mobile phase A 95% e t.. <P>25mM ammoniumacetate + 5% acetonitrile; mobile phase B: acetonitrile ; mobile phase C: methanol) were employed to run a gradient condition from 100 % A to 50% B and 50% C in 6.5 min., to 100 % B in 1 min, 100% B for 1 min. and re-equilibrate with 100 % A for 1.5 min.) yielding 0.010 g of compound 4 (yield of 5%, Melting Point 246C). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
2%; 17%; 38% | With triethylamine; In dichloromethane; at 20℃; | To a solution of triethylamine (0. 0025 mol) in CH2Cl2 (5 ml) benzoylchloride (0.0025 mol) was added. The mixture stirred at RT and intermediate 3 (0.0025 mol) in CH2C12 (5 ml) added dropwise. The reaction mixture was stirred overnight at RT. The mixture was washed 2 times with H20. The organic layer was separated, dried (MgS04), filtered off and the solvent was evaporated. The residue was purified by column chromatography over silicagel (eluent CH2Cl2) yielding O. OlOg compound 9 (yield of 2%, Melting Point 133C) and a fraction which was further purified by column chromatography over silicagel (eluent hexane/CH2Cl2) yielding 0.225 g of compound 10 (yield of 38%, Melting Point 97C-100C), and 0.100 g of compound 11 (yield of 17%, Melting Point 154C-160C). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
84% | With triethylamine; In dichloromethane; at 20℃; | A mixture of intermediate 3 (0.0025 mol) and triethylamine (0.0025 mol) in CH2C12 (10 ml) was stirred at RT. Phenylacetylchloride (0.0025 mol) was added drop wise and the reaction mixture stirred overnight at RT. The reaction mixture was washed 2 times with H20. The organic layer was separated, dried (MgS04), filtered off and the solvent was evaporated. The residue was crystallized in isopropanol. Yielding 0.210 g compound 5 (yield of 84%), melting point 164C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 20℃; | A mixture of intermediate 3 (0.0025 mol) and triethylamine (0.0025 mol) in CHzClz (10 ml) was stirred at RT. 2-methylpropanoyl chloride (0.0025 mol) was added dropwise and the reaction mixture stirred overnight at RT. The reaction mixture was washed 2 times with H20. The organic layer was separated, dried (MgS04), filtered off and the solvent was evaporated dry. The residue was further purified by column chromatography over silicagel (eluent: CH2Cl2) yielding 0.235 g of compound 8 and a fraction which was further purified using reversed phase HPLC chromatography on a Xterra MS C18 column (3. 5, um, 4.6 x 100 mm) with a flow rate of 1.6 m ./min (Elution conditions: three mobile phases (mobile phase A 95% 25mM ammoniumacetate + 5% acetonitrile; mobile phase B: acetonitrile ; mobile phase C: methanol) were employed to run a gradient condition from 100 % A to 50% B and 50% C in 6.5 min. , to 100 % B in 1 min, 100% B for 1 min. and re-equilibrate with 100 % A for 1.5 min.) yielding 0.010 g of compound 7 (Melting Point 130C). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With chlorosulfonic acid; thionyl chloride; at 20 - 60℃; | To prepare a-5, a-4 (2.1 g, 0.015 mol) was added to chlorosulfonic acid (4.1 ml, 0.060 mol) at room temperature (RT). Said reaction mixture was stirred overnight under an inert atmosphere such as nitrogen at 60C. The mixture was then poured in ice/water. The precipitate was filtered and dried with toluene in a Buchi-apparatus (2.1 g, yield 60%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In methanol; | EXAMPLE 12 3-[(4-pyridinyl)amino]-1,2-benzisoxazole A mixture of <strong>[36216-80-5]3-amino-1,2-benzisoxazole</strong> (9.94 g, 74.18 mmole, prepared according to a method described in G. M. Shutske and K. J. Kapples, J. Heterocyclic Chem., 26, 1293 (1989)), 4-chloropyridine hydrochloride (22.27 g, 197 mmole) and 1-methyl-2-pyrolidinone was stirred vigorously at 130 C. for three hours. The reaction mixture was cooled, diluted with NaHCO3, and extracted with EtOAc, after which the organics were washed with water, dried (MgSO4), and concentrated. The residue was purified by flash chromatography (florisil, EtOAc), and then triturated with diethyl ether to yield 4.04 g (26%) of a fine brown solid. A 2.0 g portion was dissolved in boiling methanol and treated with charcoal (Darco) after which the product crystallized to yield 1.38 g of pale yellow crystals, mp 203 C. (dec.). ANALYSIS: Calculated for C12 H9 N3 O: 68.24% C; 4.29% H; 19.89% N; Found: 68.14% C; 4.12% H; 20.06% N. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In N,N-dimethylformamide (DMF); N,N-dimethyl-formamide; | EXAMPLE 7 N-[2-(4-Morpholinyl)ethyl]-1,2-benzisoxazol-3-amine To a solution of <strong>[36216-80-5]3-amino-1,2-benzisoxazole</strong> (3.5 g) in N,N-dimethylformamide (DMF) (100 ml) was added sodium hydride (0.8 g) under nitrogen. The reaction was stirred one hour at ambient temperature. A solution of 4-(2-chloroethyl)morpholine (4.0 g) in DMF (50 ml) was added followed by heating to 120 C. for one hour. TLC (5% MeOH/DCM) analysis revealed the absence of starting material. The reaction was quenched with water and extracted with EtOAc. The organic layer was washed with water, dried (MgSO4), and concentrated in vacuo. Flash column chromatography (silica gel) eluding with 1.5-2.5% MeOH/DCM afforded the product (2.5 g), m.p. 79-80 C. ANALYSIS: Calculated for C13 H17 N3 O2: 63.14%C 6.93%H 16.99%N Found: 63.47%C 6.87%H 16.95%N |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In toluene; | EXAMPLE 34 2,6-DICHLORO-N-(3-BENZISOXAZOLYL)BENZAMIDE 3-Aminobenzisoxazole (2 gram), 2,6-dichlorobenzoylchloride (2 gram), and 50 ml. of toluene are heated at reflux for 16 hours. After evaporation of the solvent at reduced pressure, the resultant oily semi-solid is triturated with ether. The solid so formed is then washed with ether and water and constitutes the desired product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In dichloromethane; | EXAMPLE 27 1-(2,6-DICHLOROBENZOYL)-3-(3-BENZISOXAZOLYL)UREA 3-Aminobenzisoxazole (300 grams) and 2,6-dichlorobenzoyl isocyanate (600 grams) in 50 ml. methylene chloride were stirred at room temperature for one hour. The solvent was then evaporated and the precipitate recrystallized from ethanol. The identity of the product was determined by NMR and IR analysis, yield 500 mg., m.p.=212-215 C. Calculated: C, 51.45; H, 2.59; N, 12.00. Found: C, 51.35; H, 2.40; N, 11.84. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91.7% | With pyridine; In tetrahydrofuran; at 0 - 20℃; for 1.33333h; | (2) Bis(2,2,2-trichloroethyl) 1,2-benzisoxazol-3-ylimidodicarbonate; To a solution of 1,2-benzisoxazol-3-amine (4.00 g, 29.8 mmol) and pyridine (7.25 ml, 89.6 mmol) in tetrahydrofuran (100 ml) was added under ice-cooling, 2,2,2-trichloroethyl chloroformate (8.20 ml, 59.6 mmol), and the mixture was stirred under ice-cooling for 1 hour and at room temperature for 20 minutes. The reaction mixture was poured to water and extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. To the residue was added hexane to give 13.3 g (91.7%) of the desired product as a solid. 1H-NMR (CDCl3) delta; 4.82 (4H, s), 7.36 - 7.44 (1H, m), 7.59 - 7.65 (3H, m). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; at 0 - 20℃; for 1h; | Example 24; N-1,2-Benzisoxazol-3-yl-1-(3-phenyl-1,2,4-thiadiazol-5-yl)piperidine-4-carboxamide; [Show Image] To a solution of 1-(3-phenyl-1,2,4-thiadiazol-5-yl)piperidine-4-carboxylic acid (289 mg, 1.00 mmol) and N,N-dimethylformamide (0.010 ml) in tetrahydrofuran (5 ml) was added in water-bath, oxalyl chloride (0.174 ml, 2.00 mmol), and the mixture was stirred at room temperature for 1 hour. The solvent was distilled off under reduced pressure. The residue was added to a solution of 1,2-benzisoxazol-3-amine (134 mg, 1.00 mmol) in pyridine (0.404 ml, 5.00 mmol) under ice-cooling, followed by stirring at room temperature for 1 hour. The solvent was distilled off under reduced pressure. The residue was poured to water and extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (hexane : ethyl acetate = 1 : 1) to give the desired product as a solid. The resulting solid was recrystallized from a mixed solvent of hexane and ethyl acetate to give 60.3 mg (14.9%) of the desired product. 1H-NMR (CDCl3) delta; 2.05 - 2.22 (4H, m), 2.88 (1H, br s), 3.36 - 3.45 (2H, m), 4.11 - 4.18 (2H, m), 7.32 - 7.63 (6H, m), 8.19 - 8.27 (3H, m), 9.46 (1H, br s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | In acetonitrile; at 70℃; for 23h; | A mixture of benzo[d]isoxazol-3-ylamine (3.0 g) and CICO2Ph (0.94 ml_) in dry CH3CN (30 ml_) was stirred for 23 h at 70 0C. The reaction mixture was poured into de- ionized water, stirred for 30 min and filtered. The isolated solid was rinsed thoroughly with water and then dried under high vacuum to give 1.90 g (100%) of the title compound. MS: 255.1. |
64% | With triethylamine; In tetrahydrofuran; acetonitrile; at 0℃; | Synthesis of phenyl 1,2-benzisoxazol-3-ylcarbamate; A solution of 1,2-benzisoxazol-3-amine (1.00 g; CAS No.36216-80-5) and triethylamine (1.09 mL) in acetonitrile (5 mL) was added dropwise to at 0 C. solution of phenyl chloroformate (0.989 mL) in THF (20 mL). The reaction was stirred at 0 C. for 1 h and then allowed to warm to room temp overnight. The reaction was diluted with ethyl acetate and washed with 1N HCl and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated to give the crude product as a reddish brown solid. The solid was triturated with refluxing diisopropyl ether, cooled to room temp, and filtered to give the final product as a tan solid (1.22 g, 64%). m/z 255 (MH+). |
64% | With triethylamine; In tetrahydrofuran; acetonitrile; at 0 - 20℃; | Phenyl 1 ,2-benzisoxazol-3-ylcarbamateA solution of 1 ,2-benzisoxazol-3-amine (1.00 g; CASNo. 36216-80-5) and triethylamine (1.09 ml_) in acetonitrile (5 ml_) was added dropwise to at 0 0C solution of phenyl chloroformate (0.989 ml_) in THF (20 ml_). The reaction was stirred at 0 0C for 1 h and then allowed to warm to RT overnight. The reaction was diluted with ethyl acetate and washed with 1 N HCI and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated to give the crude product as a reddish brown solid. The solid was triturated with refluxing diisopropyl ether, cooled to RT, and filtered to give final product as a tan solid (1.22 g, 64%). m/z 255 (MH+). |
64% | With triethylamine; In tetrahydrofuran; acetonitrile; at 0 - 20℃; | A solution of 1 ,2-benzisoxazol-3-amine (1.00 g; CASNo. 36216-80-5) and triethylamine (1.09 mL) in acetonitrile (5 mL) was added dropwise to at 0 0C solution of phenyl chloroformate (0.989 mL) in THF (20 mL). The reaction was stirred at 0 0C for 1 h and then allowed to warm to room temp overnight. The reaction was diluted with ethyl acetate and washed with 1 N HCI and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated to give the crude product as a reddish brown solid. The solid was triturated with refluxing diisopropyl ether, cooled to room temp, and filtered to give the final product as a tan solid (1.22 g, 64%). m/z 255 (MH+). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With caesium carbonate; In N,N-dimethyl-formamide; at 20℃; | Example 4: (R)-l-(Benzo[rf]isoxazol-3-yIcarbamoylmethyl)-3-(l-phenyl- cycloheptanecarbonyloxy)-l-azonia-bicyclo[2.2.2]octane bromide <n="39"/> To a mixture of benzo[ |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A solution of acetoxime (0.055 mol) in DMF (50 ml) was stirred at RT, then KtBuO (0.055 mol) was added and the solution stirred for another 30 min. at RT. 2- cyanofluorobenzene (0.050 mol) was added drop wise and the reaction mixture stirred for another hour at RT. The reaction mixture was poured out in a solution of 200 ml isopropylether and 200 ml saturated NH4Cl solution and stirred vigorously for 10 minutes. After completion, the organic layer was separated, washed with water, dried (MgS04), filtered off and the solvent was evaporated dry. The residue (Yield: 9g) was dissolved in ethanol (100 ml). A solution of 2N HCl (100 ml) was added and the reaction mixture refluxed for 1 hour. After completion the solvent was evaporated, the aqueous residue alkanized with a solution of KzCO3 and extracted with EtOAc. The organic layer was separated, washed with water, dried (MgS04), filtered off and the solvent was evaporated dry. Quantitative Yielding 1-2-Benzisoxazole-3-amine 4.7 g (70%), Melting Point 111C (intermediate 3). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With caesium carbonate; In N,N-dimethyl-formamide; at 23℃; | Example 77; (3R)-1-[2-(1,2-Benzisoxazol-3-ylamino)-2-oxoethyl]-3-[2-piperidin-1-yl-2-(2-thienyl)propanoyl]oxy}-1-azoniabicyclo[2.2.2]octane chloride (Isomer 1); a) N-1,2-Benzisoxazol-3-yl-2-chloroacetamide; Benzo[d]isoxazol-3-amine (1 g) and cesium carbonate (2.429 g) in dry DMF (20 mL) was stirred at 23 C. whilst bromoacetyl chloride (0.624 mL) was added dropwise to the mixture. After stirring for 8 h, the reaction was poured into water (100 mL) and the mixture extracted with diethyl ether (2×200 mL). The combined extracts were dried over magnesium sulfate and concentrated to dryness. The crude product was purified on silica gel using 40% ether isohexane. The subtitled compound was isolated as a colourless solid (0.5 g).m/e 210 [M+H]+ 1H NMR (400 MHz, DMSO) delta 11.45 (1H, s), 8.02 (1H, d), 7.72-7.63 (2H, m), 7.39 (1H, ddd), 4.47 (2H, s). | |
a) N-Benzo[d]isoxazol-3-yl-2-chloro-acetamide To a mixture of benzo[d]isoxazol-3-ylamine (1 g) and cesium carbonate (2.42 g) in dry DMF (20 mL), stirred at rt, was added bromoacetyl chloride (0.62 mL) by dropwise addition. After stirring the mixture for 8 hours, the reaction was poured into water (100 mL) and the products extracted into ether (2*200 mL). The combined extracts were dried over magnesium sulfate and concentrated to dryness. The crude product was purified on silica gel using ether/isohexane (4/6) to afford the sub-titled compound as a colourless solid (0.5 g). m/e 210 [M+H]+ |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
(Synthesis of X-4) In a three-neck flask, after filling the inside of flask with nitrogen gas, 6.5 g of 10% Pd-C (produced by Wako Pure Chemical Industries, Ltd.) was added, and 2,000 mL of ethanol and the entire amount of the crude product of Compound (X-3) obtained above were further added. The resulting mixture was heated/refluxed, and 55 mL (3 molar equivalents) of formic acid was slowly added dropwise thereto, followed by stirring at this temperature for 5 hours. The resulting reaction mixture was cooled to an inner temperature of 25C and then subjected to Celite filtration and to the mother solution separated by filtration, 105 g of 1,5-naphthalenedisulfonic acid was added. After raising the inner temperature to 70C, the mixture was stirred for 30 minutes and then gradually cooled to room temperature, and the crystal was separated by filtration to obtain 100 g of Compound (X-4). The yield was 72% based on Compound (X-1) as the starting material. The obtained crystal was pale brown. 1H NMR (deuterated DMSO): delta6.95-6.98 (1H), delta7.02-7.04 (1H), delta7.40-7.51 (3H), delta7.90-7.95 (1H), delta8.75 (1H), delta8.85-8.88 (2H), delta9.03 (2H), delta10.89 (1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
15% | To a stirred solution of 1-(3-phenyl-1,2,4-thiadiazol-5-yl)piperidine- 4-carboxylic acid (289 mg, 1.00 mmol) and DMF (0.010 mL) in THF (5.0 mL) was added oxalyl chloride (0.174 mL, 2.00 mmol) dropwise at 0 C. After stirring at room temperature for 1 h, the solvent was concentrated in vacuo. To the residue were added THF (5.0 mL), <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> (134 mg, 1.00 mmol), and pyridine (0.404 mL, 5.00 mmol) at 0 C. The mixture was stirred at room temperature for 1.0 h, and the solvent was concentrated in vacuo. The residue was purified by silica gel column chromatography (hexane-EtOAc), and recrystallized from EtOAc- hexane to give 65a (60.3 mg, 15%) as colorless crystals, mp 204- 205 C. 1H NMR (300 MHz, CDCl3) d: 2.05-2.22 (4H, m), 2.88 (1H, bs), 3.36-3.45 (2H, m), 4.11-4.18 (2H, m), 7.32-7.63 (6H, m), 8.19-8.27 (3H, m), 9.46 (1H, br s). Analytical HPLC showed 97.4% purity. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58% | With pyridine; In tetrahydrofuran; at 0℃; for 1.5h; | General procedure: To a stirred solution of pyridin-2-amine (1.0 g, 10.6 mmol) and pyridine (1.01 mL, 12.7 mmol) in THF (35 mL) was added 2,2,2- trichloroethyl chloroformate (1.76 mL, 12.7 mmol) dropwise at 0 C. The mixture was stirred at 0 C for 1.5 h, poured into water, and extracted with EtOAc. The organic layer was washed with water, dried over anhydrous MgSO4, and concentrated in vacuo. The residue was triturated with Et2O-hexane to give 36 (1.76 g, 62%) as a colorless powder. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1 ,2-Benzoxazol-3-amine (802 mg, 5.98 mmol) was dissolved in a mixture of anhydrous dichloromethane (4 ml_) and anhydrous pyridine (1 .5 ml_, 19 mmol). To this mixture was added, drop-wise, a solution of ethyl malonyl chloride (1.00 g, 6.64 mmol) in anhydrous dichloromethane (4 ml_). The resulting warm mixture (from slight exotherm) was stirred at ambient temperature for 30 min and quenched with the addition of cold water (20 ml_). Solid sodium carbonate was added until a pH of 10 was reached, and the mixture was stirred at ambient temperature for 1 hour. The organic layer was separated and the aqueous layer back-extracted withdichloromethane (4 x 30 ml_). The combined organic layers were passed through a phase separator column and concentrated under reduced pressured to yield crude ethyl 3-(1 ,2-benzoxazol-3-ylamino)-3- oxopropanoate. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Benzisoxazole-3-amine 2 (2.68 g, 20 mmol) was dissolved in water (25 ml) and concentrated HCl (12.5 ml) under vigorous stirring in an ice/water bath. A freshly prepared, ice-cold solution of NaNO2 (1.4 g, 20 mmol) in water (10 ml) was added drop wise to the reaction mixture by keeping the internal temperature between 0 to 5 C. After the completion of addition, the reaction mixture was stirred for an additional 10 min. A freshly prepared solution of sodium azide (1.3 g, 20 mmol) in water (10 ml) was added drop wise to the reaction mixture via an additional funnel while keeping the internal temperature of the reaction mixture below 5 C. Upon complete addition of the sodium azide solution, the reaction mixture was stirred for an additional 20-30 min at 0 C, followed by stirring at room temperature for another 3 h. The reaction mixture was extracted with ethyl acetate EtOAc (25 ml) three times. The combined organic layer was washed with water (25 ml) and brine (25 ml), dried over anhydrous sodium sulphate and concentrated under reduced pressure to get crude benzisoxazole-3-azide 3, which was purified by column chromatography over silica gel (60-120 mesh) using hexane/EtOAc (8:2) as eluent. The pure benzisoxazole-3-azide 3 was stored at 2-5 C in the refrigerator. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | at 60℃;Inert atmosphere; | Under nitrogen benzo [d] isoxazol-3-amine (3.6g, 26.8mmol) was dissolved in chlorosulfonic acid (15.0mL), heated to 60 stirred overnight.Cooled to room temperature, ice water (20 mL), suction filtered, the filter cake was dried at 60 deg.] C under vacuum to give a white solid (5.0g, 87%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
9% | To a solution of <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> (1 eq.) and quinuclidin-3-one (1.1 eq.) in toluene (7 mL/mmol <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong>) at 25 C was added portion-wise titanium(IV) isopropoxide (9 eq.). The resulting solution was stirred at 100 C for 12 hours. On completion, the mixture was cooled to 0 C, and ethanol (1 mL/mmol <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong>) was added via syringe, followed by sodium borohydride (3.7 eq.) in portions. The reaction was stirred at 25 C for 3 hours, then quenched with saturated aqueous potassium carbonate solution, resulting in the formation of a solid. The mixture was filtered, and the filtrate was extracted with dichloromethane (5 chi 50 mL). The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The filter cake from the original filtration was slurried with methanol, and the mixture was filtered. The filtrate was directly evaporated to dryness. The combined residue from both batches was dissolved in 4N hydrochloric acid (20 mL) and stirred at room temperature for 4 hours. The mixture was made basic by addition of saturated potassium carbonate solution and extracted with dichloromethane (5 x 50 mL). The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was purified by prep-HPLC to give the racemic aminobenzoisoxazole product. [00408] Chiral Separation: A solution of racemic aminobenzoisoxazole product in 3-5 mL of methanol was separated by cSFC (Waters SFC Prep 80, Column temperature: 25 C, back pressure: 100 bar, and wavelength: 220 nm). Each set of collected fractions was concentrated at room temperature. The residue was dissolved in 0.2 M hydrochloric acid and lyophilized to give each enantiomer of the aminobenzoisoxazole product; Following general procedure Bl, rac-1 was prepared from benzo[d]isoxazol-3 -amine (0.40 g, 3.0 mmol). The product was purified by prep-HPLC [Instrument: GX-A; Column: Phenomenex Gemini C18 150x25 mm, particle size: 10 mupiiota; Mobile phase: 44-74% acetonitrile in H20 (add 0.5% NH3 H20, v/v)] to give rac-1 (70 mg, 9% yield) as a yellow solid. LCMS (B): tPv=1.179 min., (ES+) m/z (M+H)+ = 244.2. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
3.1% | With pyridine; at 110 - 120℃; for 4h;Microwave irradiation; | Example 149: N-(benzo[d]isoxazol-3-yl)-2,6-dimethoxybenzenesulfonamide 149 A solution of 2,6-dimethoxybenzene-1-sulfonyl chloride I111 (0.088 g, 0.37 mmol) and <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> (0.050 g, 0.37 mmol) in pyridine (1 ml.) was irradiated in the microwave at 1 10 C for 2 hours, then at 120 C for 2 hours. The reaction mixture was loaded onto silica and purified by column chromatography (12g Si02 cartridge, 0-35 % EtOAc in petroleum benzine 40-60 C) to give the title compound (3.9 mg, 3.1 % yield) as a white solid. NMR (400 MHz, CDCIs) d 8.30 (s, 1H), 8.17 (dt, J = 1.04, 8.15 Hz, 1H), 7.55 - 7.47 (m, 1H), 7.47 - 7.34 (m, 2H), 7.34 - 7.28 (m,1H), 6.60 (d, J = 8.52 Hz, 2H), 3.91 (s, 6H). LCMS-B: rt 3.13 min, m/z = 334.8[M+H]+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; at 20℃; for 16h; | A mixture of <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> and a sulfonyl chloride in pyridine (0.5 ml.) was stirred at room temperature for 16 hours. The reaction was concentrated and diluted with 5% aqueous HCI (1 ml.) and sonicated for a minimum of 30 minutes. The resulting precipitate was collected by filtration and a portion of the crude material (50 mg or less) was purified by mass directed preparative HPLC to give the desired product. See Table B for reaction components and amounts used. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
33% | With pyridine; at 110℃; for 2h;Microwave irradiation; | Example 148: N-(benzo[d]isoxazol-3-yl)-2,4-dimethoxybenzenesulfonamide 148 A solution of 2,4-dimethoxybenzenesulfonyl chloride (0.18 g, 0.75 mmol) and <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> (0.10 g, 0.75 mmol) in pyridine (1 ml.) was irradiated in the microwave at 1 10 C for 2 hours. The resultant mixture was loaded onto silica gel and the product purified twice by column chromatography (4 g Si02 cartridge, 0-45% EtOAc in petroleum benzine 40-60 C then 4g Si02 cartridge, 0-35% EtOAc in petroleum benzine 40-60 C) to yield two batches (78 mg and 5 mg) of [183] the title compound (total mass 83 mg, 33 % yield) as white solids. 1H NMR (400 MHz, CDCI3) d 8.1 1 (d, J = 8.05 Hz, 1H), 7.79 (s, 1H), 7.70 (d, J = 8.81Hz, 1H), 7.57 - 7.50 (m, 1H), 7.47 - 7.40 (m, 1H), 7.37 - 7.29 (m, 1H), 6.50 (d, J = 2.27 Hz, 1H), 6.42 (dd, J = 2.25, 8.81Hz, 1H), 3.98 (s, 3H), 3.81 (s, 3H). LCMS-B: rt 3.20 min, m/z = 356.8 [M+Na]+, 334.8 [M+H]+. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; at 20℃; for 16h; | Method BA A mixture of <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> and a sulfonyl chloride in pyridine (1 ml.) was stirred at room temperature for 16 hours. The reaction was concentrated and diluted with 5% aqueous HCI (1 ml.) and sonicated for a minimum of 30 minutes. The resulting precipitate was collected by filtration or DCM extraction (2x1 ml.) and purified using silica gel column chromatography (EtOAc/petroleum benzine 40-60 C gradient) or preparative mass-directed HPLC to give the desired product. See Table B for reaction components and amounts used as well as purification conditions. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; at 20℃; for 64h; | A mixture of <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> and a sulfonyl chloride in pyridine (0.5 ml.) was stirred at room temperature for 64 hours. The reaction was concentrated and diluted with 5% aqueous HCI (1 ml.) and sonicated for a minimum of 30 minutes. The resulting precipitate was collected by filtration and a portion of the crude material (50 mg or less) was purified by preparative mass-directed HPLC to give the desired product. See Table B for reaction components and amounts used. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50 mg | With pyridine; at 20℃; for 80h; | A mixture of <strong>[36216-80-5]benzo[d]isoxazol-3-amine</strong> and a sulfonyl chloride in pyridine (1 ml.) was stirred at room temperature for 16 hours when a second portion of benzenesulfonyl chloride was added and stirred for an additional 64 hours. The reaction was concentrated and diluted with 5% aqueous HCI (1 ml.) and sonicated for a minimum of 30 minutes. The resulting precipitate was collected by filtration and purified either by preparative mass-directed HPLC (up to 50 mg of crude material) or by silica gel column chromatography (0-40% EtOAc/petroleum benzine 40-60 C) to give the desired product. See Table C for reaction components and amounts used as well as purification conditions. |
Tags: 36216-80-5 synthesis path| 36216-80-5 SDS| 36216-80-5 COA| 36216-80-5 purity| 36216-80-5 application| 36216-80-5 NMR| 36216-80-5 COA| 36216-80-5 structure
[ 268734-42-5 ]
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[ 268734-42-5 ]
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