p-(Trifluoromethoxy)phenyl isocyanate → Ethyl 1-methyl-4-[({[4-(trifluoromethoxy)phenyl]amino}carbonyl)amino]-1H-imidazole-2-carboxylate

Participants

Reaction Steps

1.22 g (3.61 mmol) of 4-amino-1-methyl-1H-imidazole-2-carboxylic acid ethyl ester (synthesis analogous to Example 1A, Stage 3, or else according to Tetrahedron Lett. 2003, 44, 1607 and literature cited there) is mixed in 50 ml of THF under argon with 1.46 g (7.21 mmol) of 4-(trifluoromethoxy)phenylisocyanate and stirred overnight at room temperature. The reaction mixture is filtered, the filtrate is concentrated by evaporation in a vacuum, and it is purified chromatographically.

Provenance & Evidence