The cycloaddition of N,N-dimethylaminomethylidene-P-phenylphosphine to vinylallenylphosphonates

Abstract

The cycloaddition of N,N-dimethylaminomethylidene-P-phenylphosphine (I) to α-vinylallenylphosphonates (II) proceeds regioselectively with the formation of 2-dimethylamino-5-dialkoxyphosphoryl-6-isopropylidene-1-phenyl-1,2,3-tetrahydro-λ3-phosphorine (III). © 1990 Plenum Publishing Corporation.