4-(Trifluoromethyl)dihydro-2H-pyran-2,6(3H)-dione → N-[4-chloro-2-fluoro-5-(1-methoxycarbonyl-cyclobutylthio)-phenyl]-3-trifluoromethylglutaric acid monoamide

Participants

Reaction Steps

A mixture of 3.6 g of 3-trifluoromethylglutaric anhydride and 5.8 g of 1-(5-amino-2-chloro-4-fluoro-phenylthio)-cyclobutanecarboxylic acid methyl ester in 65 ml of benzene is heated under reflux for 3 hours while stirring. The resulting precipitate is then separated off, washed with diisopropyl ether and dried, yielding 7.9 g of N-[4-chloro-2-fluoro-5-(1-methoxycarbonyl-cyclobutylthio)-phenyl]-3-trifluoromethylglutaric acid monoamide having a melting point of from +165° to +167° C.

Provenance & Evidence