1,3-Dipolar cycloadditions: Part VII 1 -Cycloaddition of C,N-diarylnitrones to ethyl crotonate

Cycloaddition of C, N-diarylnitrones to ethyl crotonate occurrs with high regio- and stereo-selectivity to furnish 3,4-trans-4,5-trans-22,3-diaryl-4-carbethoxy-5-methylisoxazolidine derivatives as the major cycloadducts. The 3,4-cis-4,5-trans stereoisomers are obtained as minor products.