Hydrochloric Acid → N-{3-Ethoxy-3-[3-(4-methyl-benzo[b]thiophen-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-propionyl}-benzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

3-Ethoxy-3-[3-(4-methyl-benzo[b]thiophen-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-propionic acid (45 mg, 0.11 mmol) is dissolved in dry THF (1.0 mL) and 1,1′-carbonyl diimidazole (40 mg, 0.25 mmol) is added into it at room temperature. The mixture is stirred for 30 min and then it is heated at 55° C. for 1 hr. After the mixture is cooled down to room temperature, benzenesulfonamide (34 mg, 0.22 mmol) is added and after 10 min, 1,8-diazabicyclo[5,4,0]undec-7-ene (0.033 mL, 0.22 mmol) is added. The mixture is stirred for 4 hr at room temperature and 1.0 M HCl solution (3 mL) is added followed by water (30 mL). The mixture is extracted with EtOAc (3×50 mL) and the organic layers are combined, dried and concentrated to give crude product. Purification by preparative TLC using 6% MeOH in CH2Cl2 with 1.0% concentrated aqueous NH4OH solution (28%) affords 22 mg (36%) of N-{3-Ethoxy-3-[3-(4-methyl-benzo[b]thiophen-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-propionyl}-benzenesulfonamide. LCMS (ESMS): m/z 550.15 (M+H+).

Provenance & Evidence