Ethyl 3-amino-2-(((2'-cyano-[1,1'-biphenyl]-4-yl)methyl)amino)benzoate → Ethyl 1-[(2'-cyanobiphenyl-4-yl)methyl]-2-mercaptobenzimidazole-7-carboxylate

Participants

Reaction Steps

A mixture of ethyl 3-amino-2-[(2′-cyanobiphenyl-4-yl)-methyl]aminobenzoate (5.6 g) and sodium O-ethyl dithiocarbonate (7.3 g) in ethanol (50 ml) was heated for 8 hours under reflux. The reaction mixture was concentrated and the residue was dissolved in water. The solution was adjusted to pH 3-4 with hydrochloric acid. Precipitating crystals were collected by filtration, followed by recrystallization from ethanol to afford yellow crystals (5.0 g, 80%), m.p. 225-227° C.

Provenance & Evidence