4-chlorobutane-1-sulfonyl chloride

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: To a solution of methyl 4-amino-1H-indole-6-carboxylate (D201) (1.0 g, 5.3 mmol, 1 equiv) in CH2Cl2 (50 ml) were added pyridine (0.55 g, 6.5 mmol, 1.2 equiv), 4-chloro-1-butanesulfonyl chloride (1.14 g, 6 mmol, 1.1 equiv) and DMAP (300 mg, 2.45 mmol, 0.5 equiv) and the resulting mixture was stirred at room temperature for 5 h. NEt3 (1 ml, 7.2 mmol, 1.3 equiv) was added and the resulting solution stirred for 2 h then diluted with AcOEt, washed with a 2N aqueous solution, a saturated aqueous NaHCO3 solution, dried over MgSO4 and concentrated in vacuo. The residue was dissolved in MeOH (20 ml) and treated with a 2N aqueous NaOH solution (10 ml, 20 mmol, excess). The resulting solution was stirred at room temperature for 15 h then most of the MeOH was removed in vacuo. The residue was partitioned between AcOEt and a 2N aqueous HCl solution. The two layers were separated and the organic phase was dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (CH2Cl2/MeOH: 9/1) gave 4-(1,1-dioxidotetrahydro-2H-1,2-thiazin-2-yl)-1H-indole-6-carboxylic acid (A155) (320 mg, 20%) as a pale pink solid. [M+H]=295.0, RT=1.90 min. the resulting solution stirred for 2 h washed with a 2N aqueous solution a saturated aqueous NaHCO3 solution, dried over MgSO4 concentrated in vacuo The residue was dissolved in MeOH (20 ml) The resulting solution was stirred at room temperature for 15 h most of the MeOH was removed in vacuo The residue was partitioned between AcOEt The two layers were separated the organic phase was dried over MgSO4 concentrated in vacuo Purification of the residue by flash chromatography on silica gel (CH2Cl2/MeOH: 9/1)

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

Procedure: To a solution of methyl 4-amino-1H-indole-6-carboxylate (D201) (1.0 g, 5.3 mmol, 1 equiv) in CH2Cl2 (50 ml) were added pyridine (0.55 g, 6.5 mmol, 1.2 equiv), 4-chloro-1-butanesulfonyl chloride (1.14 g, 6 mmol, 1.1 equiv) and DMAP (300 mg, 2.45 mmol, 0.5 equiv) and the resulting mixture was stirred at room temperature for 5 h. NEt3 (1 ml, 7.2 mmol, 1.3 equiv) was added and the resulting solution stirred for 2 h then diluted with AcOEt, washed with a 2N aqueous solution, a saturated aqueous NaHCO3 solution, dried over MgSO4 and concentrated in vacuo. The residue was dissolved in MeOH (20 ml) and treated with a 2N aqueous NaOH solution (10 ml, 20 mmol, excess). The resulting solution was stirred at room temperature for 15 h then most of the MeOH was removed in vacuo. The residue was partitioned between AcOEt and a 2N aqueous HCl solution. The two layers were separated and the organic phase was dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (CH2Cl2/MeOH: 9/1) gave 4-(1,1-dioxidotetrahydro-2H-1,2-thiazin-2-yl)-1H-indole-6-carboxylic acid (A155) (320 mg, 20%) as a pale pink solid. [M+H]=295.0, RT=1.90 min. the resulting solution stirred for 2 h washed with a 2N aqueous solution a saturated aqueous NaHCO3 solution, dried over MgSO4 concentrated in vacuo The residue was dissolved in MeOH (20 ml) The resulting solution was stirred at room temperature for 15 h most of the MeOH was removed in vacuo The residue was partitioned between AcOEt The two layers were separated the organic phase was dried over MgSO4 concentrated in vacuo Purification of the residue by flash chromatography on silica gel (CH2Cl2/MeOH: 9/1)

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

Procedure: To a solution of methyl 4-amino-1H-benzimidazole-6-carboxylate (D251) (1.1 g, 5.76 mmol, 1 equiv) in CH2Cl2 (80 ml) at room temperature were added pyridine (1.02 ml, 12.67 mmol, 2.2 equiv), 4-chloro-1-butanesulfonyl chloride (D20) (2.31 g, 12.1 mmol, 2.1 equiv) and DMAP (704 mg, 5.76 mmol, 1 equiv) and the resulting mixture was stirred for 1 h then concentrated in vacuo. The residue was diluted with AcOEt and the organic phase was washed with a 2N aqueous HCl solution and brine, then dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 2/3) gave methyl 4-{[(4-chlorobutyl)sulfonyl]amino}-1H-benzimidazole-6-carboxylate (D252) (1 g, 50%) as a colorless oil. [M+H]+=346.1, RT=2.97 min. then concentrated in vacuo The residue was diluted with AcOEt the organic phase was washed with a 2N aqueous HCl solution and brine dried over MgSO4 concentrated in vacuo Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 2/3)

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

Procedure: To a solution of methyl 4-amino-1H-benzimidazole-6-carboxylate (D251) (1.1 g, 5.76 mmol, 1 equiv) in CH2Cl2 (80 ml) at room temperature were added pyridine (1.02 ml, 12.67 mmol, 2.2 equiv), 4-chloro-1-butanesulfonyl chloride (D20) (2.31 g, 12.1 mmol, 2.1 equiv) and DMAP (704 mg, 5.76 mmol, 1 equiv) and the resulting mixture was stirred for 1 h then concentrated in vacuo. The residue was diluted with AcOEt and the organic phase was washed with a 2N aqueous HCl solution and brine, then dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 2/3) gave methyl 4-{[(4-chlorobutyl)sulfonyl]amino}-1H-benzimidazole-6-carboxylate (D252) (1 g, 50%) as a colorless oil. [M+H]+=346.1, RT=2.97 min. then concentrated in vacuo The residue was diluted with AcOEt the organic phase was washed with a 2N aqueous HCl solution and brine dried over MgSO4 concentrated in vacuo Purification of the residue by flash chromatography on silica gel (AcOEt/iso-hexane: 2/3)

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

Procedure: To a solution of ethyl 7-amino-3-ethyl-1H-indole-5-carboxylate (D222) (150 mg, 0.65 mmol, 1 equiv) in CH2Cl2 (10 ml) at room temperature were added pyridine (115 μl, 1.42 mmol, 2.2 equiv), 4-chloro-1-butanesulfonyl chloride (D20) (259 mg, 1.36 mmol, 2.1 equiv) and DMAP (8 mg, 0.065 mmol, 0.1 equiv) and the resulting mixture was stirred for 1 h then diluted with AcOEt and washed with a 2N aqueous HCl solution and brine, then dried over MgSO4 and concentrated in vacuo to give ethyl 7-{[(4-chlorobutyl)sulfonyl]amino}-3-ethyl-1H-indole-5-carboxylate (D242) (230 mg, 92%) as a purple oil which was used in the next step without further purification. [M+H]+=387.3, RT=3.35 min. washed with a 2N aqueous HCl solution and brine dried over MgSO4 concentrated in vacuo

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

Procedure: Description 92 was prepared in an analogous manner to Description 91 from 5-amino-N,N-dipropyl-isophthalamic acid methyl ester (D88) and 4-chloro-butane-1-sulfonyl chloride.

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

Procedure: To an ice-cooled solution of 4-chloro-1-butanesulfonyl chloride (D20) (43 g, 225 mmol, 1 equiv) in CH2Cl2 (350 ml) was slowly added aqueous ammonia solution (25%, 140 ml). The resulting mixture was stirred at room temperature for 16 h then concentrated in vacuo. The residue was diluted with AcOEt and washed with brine. The organic phase was dried over MgSO4 and concentrated in vacuo to give crude 3-chloro-1-butanesulfonamide (D21b) (31 g, 88%). then concentrated in vacuo The residue was diluted with AcOEt washed with brine The organic phase was dried over MgSO4 concentrated in vacuo