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The influence of MgBr2, MgI2 and Ti(OiPr)4 on the regioand stereoselective outcome of 1,3dipolar cycloaddition of mesitonitriloxide 1 to both E and Z isomers of (5S)-5,6-(Oisopropylidenedioxa)hex-3-en-2-one (2a) or (4S)-1-(2-furyl)-4,5-(O isopropylidenedioxa) pent3-en-1-one (2b) was studied. Addition of Lewis acids in some cases has a dramatic effect on the regiochemistry as well as on the diastereomeric ratio of cycloadducts.

1,3-Dipolar cycloaddition of mesitonitrile oxide to chirala,ß-unsaturated enones catalyzed by Lewis acids