N-alkylsulfonylimines as dipolarophiles in cycloaddition reactions

Abstract

First described in the late 1960s, N-alkylsulfonylimines are heterocumulenes that participate in reactions with a range of 1,3-dipoles to afford interesting 3-, 4-, 5-, and 6-membered heterocycles. The distribution of adducts obtained suggests that multistage, stepwise mechanistic pathways rather than a concerted process are in operation.