(4+2)-CYCLOADDITION OF NITROALKENES WITH YNAMINES; FORMATION OF A 4H-1,2-OXAZINE 2-OXIDE DERIVATIVE

Article abstract of DOI:10.1016/S0040-4039(00)77837-3

The formation of a thermally unstable (4+2)-cycloadduct, a 4H-1,2-oxazine 2-oxide derivative (1), from the reaction of 1-nitrocyclopentene with 1-phenyl-2-(1-pyrrolidinyl)acetylene has been proven by the structure elucidation of isoxazole derivative 3 whi