Sodium Hydroxide → 4-(5,6-dichloro-1H-benzimidazol-2-yl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 5,6-dichloro-2-(4-methoxycarbonylphenyl)benzimidazole (2.4 g, 7.47 mmol), prepared as described in Preparation 7, 20% NaOH (7.5 ml, 37.5 mmol) in THF (25 ml) was heated at 50° C. for 1 h. After cooling at room temperature, solvent was removed under reduced pressure and pH was adjusted to 5 with acetic acid. The solid that was precipitated was filtered and dried at 50° C. to give 2.1 g of the title compound (yield 91.8%) as a brown solid, mp>250° C.

Provenance & Evidence