The cycloaddition of C-phenyl-N-methylnitrone with 3, 3, 3-trifluoropropene and methyl 4, 4, 4-trifluoro-2-butenoate regio-and stereoselectively gave trans-2-methyl-3-phenyl-5- trifluoromethylisoxazolidine (3a) and methyl 2-methyl-c-3-phenyl-t-5-trifluoromethyl-r-4- isoxazolidinecarboxylate (3b), respectively, as major products. The cycloaddition with 3, 3, 3- trifluoro-1-nitropropene proceeded regiospecifically to give 2-methyl-c-4-nitro-r-3-phenyl-t- ...
