Enantioselective Intramolecular Nitrone Cycloaddition Route to 3-(Trifluoromethyl)-isoxazolidino[4,3-c]-chroman-4-ones and -quinolin-4-ones†
Abstract
Optically active 3-(trifluoromethyl)isoxazolidino[4,3-c]-chroman-4-ones and -quinolin-4-ones are synthesised by the stereoselective intramolecular cycloaddition of homochiral nitrones.