Abstract
Despite the long history of nitrone chemistry, novel transformations of nitrones continue
to be discovered. This article describes some recent breakthroughs in the development
of new transformations of nitrones. These new reactions include formal [3+3] cycloaddition
of nitrones and vinylcarbenes to give 3,6-dihydro-1,2-oxazines, tandem cyclization–[3+3]
cycloaddition of nitrones and enynones to give furo[3,4-d][1,2]oxazines, [2+2+3] cycloaddition of nitrones and 1,6-enynes to give tricyclic
1,2-oxazepanes, reaction of nitrones and 2-azido acrylates to form 1,2,4,5-tetrasubstituted
imidazoles, and reactions of α,β-unsaturated N-aryl ketonitrones and activated alkynes to generate C3-quaternary indolenines.
Key words
nitrone - dipolar cycloaddition - tandem reaction - catalysis - indolenine