ENZYMATIC PROCESSES FOR THE PREPARATION OF (±)-2-(DIFLUOROMETHYL)-1-(ALKOXYCARBONYL)-CYCLOPROPANECARBOXYLIC ACID AND (±)-2-(VINYL)-1-(ALKOXYCARBONYL)-CYCLOPROPANECARBOXYLIC ACID

摘要

Disclosed are methods of synthesizing racemic 2-(difluoromethyl)-1-(alkoxycarbonyl)-cyclopropanecarboxylic acids and 2-(vinyl)-1-(alkoxycarbonyl)-cyclopropanecarboxylic acids and their salts, such as the dicyclohexylamine salt. Also disclosed are methods for preparing enantioenriched (1R,2R)-1-((tert-butoxycarbonyl)amino)-2-(difluoromethyl)cyclopropane-1-carboxylic acid and esters of the same. These compounds are useful intermediates in the synthesis of viral protease inhibitors.