* 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.
Stage #1: With lithium hydroxide; water In tetrahydrofuran at 20℃; for 4 h; Stage #2: With hydrogenchloride In tetrahydrofuran; water
To a solution of 600 mg (3.23 mmol) of 4-chloro-2-nitro-benzaldehyde in DMF (7 ml) were added 559 mg (4.04 mmol) of potassium carbonate and 294 μl (3.23 mmol) of methyl thioglycolate at 0° C. The reaction mixture was stirred for 30 min at 0° C. and then for 24 h at RT. Then the mixture was poured into ice-water and the precipitate was collected by filtration and dissolved in ethyl acetate. The solution was dried (MgSO4) and concentrated to yield 630 mg (86percent) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester as a white solid. 1HNMR (CDCl3, 300 MHz): δ 3.95 (s, 3H), 7.88 (dd, J=8.6 and 1.9 Hz, 1H), 7.79 (d, J=8.6 Hz, 1H), 7.85 (d, J=1.9 Hz, 1H), 8.02 (s, 1H).To a solution of 630 mg (2.78 mmol) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester in THF (5 ml) were added 6.95 ml of 1N LiOH-solution and the reaction mixture was stirred at RT for 4 h. The pH was then adjusted to 2-3 by addition of 1N HCl and the mixture was extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated to yield 579 mg (98percent) of 6-chloro-benzo[b]thiophene-2-carboxylic acid as white solid. MS (ISP) 211.0 (M-H)-.In analogy to example S3 (steps a to b) 139 mg (0.65 mmol) of 6-chloro-benzo[b]thiophen-2-carboxylic acid were converted into 52 mg (0.14 mmol) of (6-chloro-benzo[b]thiophen-2-ylmethyl)-[2-(3,4-dichloro-phenyl)-ethyl]-amine. The product was obtained as colorless liquid. MS (ISP) 370.0 (M+H)+.
60%
Stage #1: With lithium hydroxide monohydrate; water In tetrahydrofuran at 20℃;
To a solution of compound B-101 (10 g, 44 mmol) in tetrahydrofuran (200 mL) and water ( 10 mL) was added lithium hydroxide monohydrate (5.6 g, 0.13 mol). The reaction mixture was stirred at room temperature overnight. On completion, the reaction mixture was concentrated in vacuo to remove tetrahydrofuran and poured into water (400 mL). The pH was adjusted to 3 with 4M hydrochloric acid, resulting in formation of a solid. The solid was collected by filtration, washed with water and dried in vacuo to give compound B-102 (5.6 g, 60percent yield) as a white solid. LCMS: (ES+) m/z (M+H)+ = 212.9.
Reference：
[1] Patent: US2007/185113, 2007, A1, . Location in patent: Page/Page column 13
[2] Patent: WO2016/100184, 2016, A1, . Location in patent: Paragraph 00270
[3] Journal of Medicinal Chemistry, 2007, vol. 50, # 20, p. 4793 - 4807
2
[ 5551-11-1 ]
[ 2365-48-2 ]
[ 104795-85-9 ]
Yield
Reaction Conditions
Operation in experiment
86%
With potassium carbonate In N,N-dimethyl-formamide at 0 - 20℃; for 24.5 h;
To a solution of 600 mg (3.23 mmol) of 4-chloro-2-nitro-benzaldehyde in DMF (7 ml) were added 559 mg (4.04 mmol) of potassium carbonate and 294 μl (3.23 mmol) of methyl thioglycolate at 0° C. The reaction mixture was stirred for 30 min at 0° C. and then for 24 h at RT. Then the mixture was poured into ice-water and the precipitate was collected by filtration and dissolved in ethyl acetate. The solution was dried (MgSO4) and concentrated to yield 630 mg (86percent) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester as a white solid. 1HNMR (CDCl3, 300 MHz): δ 3.95 (s, 3H), 7.88 (dd, J=8.6 and 1.9 Hz, 1H), 7.79 (d, J=8.6 Hz, 1H), 7.85 (d, J=1.9 Hz, 1H), 8.02 (s, 1H).To a solution of 630 mg (2.78 mmol) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester in THF (5 ml) were added 6.95 ml of 1N LiOH-solution and the reaction mixture was stirred at RT for 4 h. The pH was then adjusted to 2-3 by addition of 1N HCl and the mixture was extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated to yield 579 mg (98percent) of 6-chloro-benzo[b]thiophene-2-carboxylic acid as white solid. MS (ISP) 211.0 (M-H)-.In analogy to example S3 (steps a to b) 139 mg (0.65 mmol) of 6-chloro-benzo[b]thiophen-2-carboxylic acid were converted into 52 mg (0.14 mmol) of (6-chloro-benzo[b]thiophen-2-ylmethyl)-[2-(3,4-dichloro-phenyl)-ethyl]-amine. The product was obtained as colorless liquid. MS (ISP) 370.0 (M+H)+.
With potassium carbonate; In N,N-dimethyl-formamide; at 0 - 20℃; for 24.5h;
To a solution of 600 mg (3.23 mmol) of 4-chloro-2-nitro-benzaldehyde in DMF (7 ml) were added 559 mg (4.04 mmol) of potassium carbonate and 294 mul (3.23 mmol) of methyl thioglycolate at 0 C. The reaction mixture was stirred for 30 min at 0 C. and then for 24 h at RT. Then the mixture was poured into ice-water and the precipitate was collected by filtration and dissolved in ethyl acetate. The solution was dried (MgSO4) and concentrated to yield 630 mg (86%) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester as a white solid. 1HNMR (CDCl3, 300 MHz): delta 3.95 (s, 3H), 7.88 (dd, J=8.6 and 1.9 Hz, 1H), 7.79 (d, J=8.6 Hz, 1H), 7.85 (d, J=1.9 Hz, 1H), 8.02 (s, 1H).To a solution of 630 mg (2.78 mmol) of 6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester in THF (5 ml) were added 6.95 ml of 1N LiOH-solution and the reaction mixture was stirred at RT for 4 h. The pH was then adjusted to 2-3 by addition of 1N HCl and the mixture was extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated to yield 579 mg (98%) of 6-chloro-benzo[b]thiophene-2-carboxylic acid as white solid. MS (ISP) 211.0 (M-H)-.In analogy to example S3 (steps a to b) 139 mg (0.65 mmol) of 6-chloro-benzo[b]thiophen-2-carboxylic acid were converted into 52 mg (0.14 mmol) of (6-chloro-benzo[b]thiophen-2-ylmethyl)-[2-(3,4-dichloro-phenyl)-ethyl]-amine. The product was obtained as colorless liquid. MS (ISP) 370.0 (M+H)+.
With potassium carbonate; In N,N-dimethyl-formamide; at 60℃; for 15.0h;
General procedure: To a stirred solution of compound 1a-1n (9.90 mmol) in DMF (20 mL) were added methyl thioglycolate (10.9 mmol) and potassium carbonate (39.6 mmol). The resulting mixture was stirred at 60 C for 15 h. The DMF was removed under reduced pressure,water (50 mL) was added and the mixture was extracted with ethylacetate (2 x 40 mL). The combined organic layers were dried withsodium sulfate, filtered, and the solvents were removed under reduced pressure to afford the title compound 2a-2n [31,34].
With triethylamine; In dimethyl sulfoxide; at 80℃; for 1.0h;
To a mixture of 4-chloro-2-fluorobenzaldehyde (50 g, 0.32 mol) and methyl 2- mercaptoacetate (40 g, 0.38 mol) in dimethylsulfoxide (500 mL) was added triethylamine (96 g, 0.95 mol) at room temperature. The mixture was stirred at 80 C for 1 hour. On completion, the reaction mixture was cooled to room temperature and poured into ice water (4 L), resulting in formation of a solid. The mixture was stirred for half an hour, and the solid was collected by filtration, washed with water and dried in vacuo to give compound B-101 (80 g, crude) as a yellow solid. LCMS: (ES+) m/z (M+H)+ = 227.0.
To a solution of 600 mg (3.23 mmol) of 4-chloro-2-nitro-benzaldehyde in DMF (7 ml) were added 559 mg (4.04 mmol) of potassium carbonate and 294 mul (3.23 mmol) of methyl thioglycolate at 0 C. The reaction mixture was stirred for 30 min at 0 C. and then for 24 h at RT. Then the mixture was poured into ice-water and the precipitate was collected by filtration and dissolved in ethyl acetate. The solution was dried (MgSO4) and concentrated to yield 630 mg (86%) of <strong>[104795-85-9]6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester</strong> as a white solid. 1HNMR (CDCl3, 300 MHz): delta 3.95 (s, 3H), 7.88 (dd, J=8.6 and 1.9 Hz, 1H), 7.79 (d, J=8.6 Hz, 1H), 7.85 (d, J=1.9 Hz, 1H), 8.02 (s, 1H).To a solution of 630 mg (2.78 mmol) of <strong>[104795-85-9]6-chloro-benzo[b]thiophene-2-carboxylic acid methyl ester</strong> in THF (5 ml) were added 6.95 ml of 1N LiOH-solution and the reaction mixture was stirred at RT for 4 h. The pH was then adjusted to 2-3 by addition of 1N HCl and the mixture was extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated to yield 579 mg (98%) of 6-chloro-benzo[b]thiophene-2-carboxylic acid as white solid. MS (ISP) 211.0 (M-H)-.In analogy to example S3 (steps a to b) 139 mg (0.65 mmol) of 6-chloro-benzo[b]thiophen-2-carboxylic acid were converted into 52 mg (0.14 mmol) of (6-chloro-benzo[b]thiophen-2-ylmethyl)-[2-(3,4-dichloro-phenyl)-ethyl]-amine. The product was obtained as colorless liquid. MS (ISP) 370.0 (M+H)+.
94%
With potassium hydroxide; In water; for 3.0h;Reflux;
General procedure: The solution of compound 2a-2n (1.1 mmol) in water (10 mL)was stirred and then potassium hydroxide pellets (5.4 mmol) wereadded, which was refluxed for 3 h. The aqueous layer was thenacidified to pH 1 with 1M hydrochloric acid solution. The aqueouslayer was extracted with dichloromethane (3 x 15 mL). The combinedorganic layers were dried with sodium sulfate, filtered, andthe solvents were removed under reduced pressure to afford thetitle compound 3a-3n [31,34].
60%
To a solution of compound B-101 (10 g, 44 mmol) in tetrahydrofuran (200 mL) and water ( 10 mL) was added lithium hydroxide monohydrate (5.6 g, 0.13 mol). The reaction mixture was stirred at room temperature overnight. On completion, the reaction mixture was concentrated in vacuo to remove tetrahydrofuran and poured into water (400 mL). The pH was adjusted to 3 with 4M hydrochloric acid, resulting in formation of a solid. The solid was collected by filtration, washed with water and dried in vacuo to give compound B-102 (5.6 g, 60% yield) as a white solid. LCMS: (ES+) m/z (M+H)+ = 212.9.
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