2,6-Difluorobenzoyl isocyanate → N-[[[4-[2-chloro-4-(trifluoromethyl)phenoxy]-2-fluorophenyl][[(2,6-difluorobenzoyl)amino]carbonyl]amino]thio]-L-proline, methyl ester

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Reaction Steps

A solution of 2,6-difluorobenzoylisocyanate (2.8 g) in a 1:1 mixture of toluene and petroleum ether (10 ml) was added at room temperature over 30 minutes to a stirred solution of the compound of Example 4 (6.5 g) in the same solvent (20 ml). After stirring at room temperature for 3 hours, the solvent was stripped and the residue purified by chromatography over silica using dichloromethane as eluant, to give 5.5 g of the desired product, melting point 65°-68° C.

Provenance & Evidence