Ammonia → 6-Carbamoyl-1-(2,4-dichlorobenzyl)-2-methylbenzimidazole

Participants

Reaction Steps

Oxylyl chloride (0.437 g) is added to a methylene chloride (8 ml) solution of 6-carboxy-1-(2,4-dichlorobenzyl)-2-methylbenzimidazole (0.490 g) and N,N-dimethylformamide (1 drop) under ice-chilled conditions, and the solution is stirred for 1.5 hours at room temperature. Then, 28% aqueous ammonia (4 ml) is added and the solution is stirred for 12 hours at room temperature. Water and methylene chloride are added to the reaction solution for extraction. After the organic layer is concentrated, precipitated crystals are collected, dried and 6-carbamoyl-1-(2,4-dichlorobenzyl)-2-methylbenzimidazole (0.240 g) is obtained. 1H-NMR (DMSO-d6, δ): 2.48 (3H, s), 5.54 (2H, s), 6.41 (1H, d, J=8.4 Hz), 7.21-8.02 (3H, m), 7.31 (1H, dd, J=2.2 and 8.4 Hz), 7.60 (1H, d, J=8.4 Hz), 7.75 (1H, m), 7.93 (1H, s).

Provenance & Evidence