2-amino-4-fluorobenzenethiol

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-chloro-5-fluoronitrobenzene (1.81 g, 10.31 mmol) dissolved in 30 mL of deionized water at room temperature was added sodium sulfide nonahydrate (9.90 g, 41.24 mmol) in a single portion. The resulting solution was heated to reflux and stirred under nitrogen for 32 hours. The resulting light yellow solution was then cooled to room temperature and was washed with 5×50 mL of ethyl acetate. The organic phase was dried over anhydrous magnesium sulfate, filtered, and evaporated to yield a yellow oil. The crude material was purified by flash chromatography eluting with CH2Cl2:MeOH=10:1 to yield 0.36 g (25%) of the title compound. MS (m/z, ES+): 144.0 (M+1, 100%); IR (KBr): 3430, 3340, 1615, 1573, 1482, 1281, 1248, 1172, 1124, 1044, 975, 840, 792 cm−1; 1H NMR (300 MHz, ppm, DMSO-d6) δ: 6.89 (dt, 1H), 6.50 (dd, 1H), 6.21 (dt, 1H), 5.80 (br s, 2H). The resulting solution was heated to reflux was washed with 5×50 mL of ethyl acetate The organic phase was dried over anhydrous magnesium sulfate filtered evaporated to yield a yellow oil The crude material was purified by flash chromatography eluting with CH2Cl2

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (460 mg, 97%) was prepared from 2-amino-4-fluorobenzenethiol (562 g, 3.93 mmol), 1-(bromomethyl)-3-nitrobenzene (566 mg, 2.62 mmol), K2CO3 (1.8 g, 13.10 mmol) in DMF (10 ml).

Conditions: temp:129.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 5-fluoro-2-methylbenzo[d]thiazole (1.2 g, 7.18 mmol) in ethylene glycol and NaOH (5N, 2 ml) was degassed under N2 for 10 min, then refluxed at 129° C. for 3 hours. The solution was cooled to 0° C. and then acidified to pH 3˜4 using c. HCl. The mixture was extracted with EtOAc (2×50 ml). The organic layer was washed with brine and dried with Na2SO4 and concentrated in vacuo. The crude residue (1.01 g, 98%) was used directly in the next step without purification. The solution was cooled to 0° C. The mixture was extracted with EtOAc (2×50 ml) The organic layer was washed with brine dried with Na2SO4 concentrated in vacuo The crude residue (1.01 g, 98%) was used directly in the next step without purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (873 mg, 94%) was prepared from 2-amino-4-fluorobenzenethiol (456 mg, 3.19 mmol) and methyl 4-(bromomethyl)benzoate (731 mg, 3.19 mmol), K2CO3 (1.32 g, 9.58 mmol) in DMF (20 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (873 mg, 94%) was prepared from 2-amino-4-fluorobenzenethiol (456 mg, 3.19 mmol) and methyl 4-(bromomethyl)benzoate (731 mg, 3.19 mmol), K2CO3 (1.32 g, 9.58 mmol) in DMF (20 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (750 mg, 88%) was prepared from 2-amino-4-fluorobenzenethiol (417 mg, 2.92 mmol) and methyl 3-(bromomethyl)benzoate (666 mg, 2.92 mmol), K2CO3 (1.21 g, 8.75 mmol) in DMF (10 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (750 mg, 88%) was prepared from 2-amino-4-fluorobenzenethiol (417 mg, 2.92 mmol) and methyl 3-(bromomethyl)benzoate (666 mg, 2.92 mmol), K2CO3 (1.21 g, 8.75 mmol) in DMF (10 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (1.8 g, 60%) was prepared from 2-amino-4-fluorobenzenethiol (1.4 g, 9.79 mmol) and methyl 2-(bromomethyl)benzoate (2.2 g, 9.79 mmol), K2CO3 (4.0 g, 29.4 mmol) in DMF (50 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (1.8 g, 60%) was prepared from 2-amino-4-fluorobenzenethiol (1.4 g, 9.79 mmol) and methyl 2-(bromomethyl)benzoate (2.2 g, 9.79 mmol), K2CO3 (4.0 g, 29.4 mmol) in DMF (50 ml).

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Following General Procedure A, the title compound (460 mg, 97%) was prepared from 2-amino-4-fluorobenzenethiol (562 g, 3.93 mmol), 1-(bromomethyl)-3-nitrobenzene (566 mg, 2.62 mmol), K2CO3 (1.8 g, 13.10 mmol) in DMF (10 ml).

Conditions: temp:129.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 5-fluoro-2-methylbenzo[d]thiazole (1.2 g, 7.18 mmol) in ethylene glycol and NaOH (5N, 2 ml) was degassed under N2 for 10 min, then refluxed at 129° C. for 3 hours. The solution was cooled to 0° C. and then acidified to pH 3˜4 using c. HCl. The mixture was extracted with EtOAc (2×50 ml). The organic layer was washed with brine and dried with Na2SO4 and concentrated in vacuo. The crude residue (1.01 g, 98%) was used directly in the next step without purification. The solution was cooled to 0° C. The mixture was extracted with EtOAc (2×50 ml) The organic layer was washed with brine dried with Na2SO4 concentrated in vacuo The crude residue (1.01 g, 98%) was used directly in the next step without purification

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-chloro-5-fluoronitrobenzene (1.81 g, 10.31 mmol) dissolved in 30 mL of deionized water at room temperature was added sodium sulfide nonahydrate (9.90 g, 41.24 mmol) in a single portion. The resulting solution was heated to reflux and stirred under nitrogen for 32 hours. The resulting light yellow solution was then cooled to room temperature and was washed with 5×50 mL of ethyl acetate. The organic phase was dried over anhydrous magnesium sulfate, filtered, and evaporated to yield a yellow oil. The crude material was purified by flash chromatography eluting with CH2Cl2:MeOH=10:1 to yield 0.36 g (25%) of the title compound. MS (m/z, ES+): 144.0 (M+1, 100%); IR (KBr): 3430, 3340, 1615, 1573, 1482, 1281, 1248, 1172, 1124, 1044, 975, 840, 792 cm−1; 1H NMR (300 MHz, ppm, DMSO-d6) δ: 6.89 (dt, 1H), 6.50 (dd, 1H), 6.21 (dt, 1H), 5.80 (br s, 2H). The resulting solution was heated to reflux was washed with 5×50 mL of ethyl acetate The organic phase was dried over anhydrous magnesium sulfate filtered evaporated to yield a yellow oil The crude material was purified by flash chromatography eluting with CH2Cl2