Reaction mechanism and structure of new heterocycles via 1,4-dipolar cycloaddition of imidazo[2,1-b]thiazolium-betaine

Abstract

New heterocycles, (12RS, 13SR)- and (12SR, 13SR)-12-benzoyl-2,4-dioxo-1,3,9-triphenyl-6,7-dihydro-12H-thiazino[3′,4′; 2,3]imidazo[1,2-a][1,3,5]triazines (4a and 4b), were synthesized via 1,4-dipolar cycloaddition from 5,6-dihydro-3-phenyl-7-[N-phenyl(carbamoyl)]imidazo[2,1-b]thiazolium-betaine (2) by the treatment of phenacyl bromide. ？ 1991.