1,3-Dipolar cycloaddition reactions of nitrile oxides with 4,5-dihydrooxazole and 4,5-dihydrothiazole derivatives

Article abstract of DOI:10.1016/S0040-4020(01)90381-3

4,5-Dihydro-2-methyloxazole 1a and 4,5-dihydro-2,4,4-trimethyloxazole 1b, which are examples of cyclic imidate esters, undergo 1,3-dipolar cycloaddition reactions with benzonitrile N-oxide, to give the appropriate 5,6-dihydro-7a-methyl-3-phenyl-7aH-oxazol