4-Nitro-2-phenyloxazole: an electrophilic dienophile for normal Diels–Alder reactions in the oxazole series
Abstract
The title compound 2, obtained by thermal isomerization of the corresponding nitroisoxazole 1, is found to undergo [2 + 4] cycloaddition processes with 2,3-dimethylbuta-1,3-diene and cyclohexa-1,3-diene, respectively.