[2+4]-Cycloaddition reactions of methyl trifluoropyruvate trifluoroacetylimine
摘要:
Methyl trifluoropyruvate trifluoroacetylimine (I) reacts regioselectively with olefins to form dihydrooxazines (II)-(VII). In its reactions with 1,3-dienes, too, compound (I) exhibits properties of a 1,3-heterodiene rather than a dienophile. Acid hydrolysis of the synthesized oxazines results in their conversion to substituted alpha-amino-alpha-trifluoromethyltetrahydrofuran-2-ones (XII)-(XVI).