Reaction of acetylenic esters and N-functionalized phosphazenes. 1,2- versus 1,4-addition of N-vinylic phosphazenes
作者:Francisco Palacios、Concepción Alonso、Jaione Pagalday、Ana María Ochoa de Retana、Gloria Rubiales
DOI:10.1039/b212693a
日期:2003.3.27
Reaction of phosphazenes derived from aminophosphonates with acetylenicesters leads to conjugated phosphorus ylides. The formation of these stabilized ylides is explained through a [2 + 2] cycloaddition reaction of the P = N linkage of the phosphazene (1,2-addition) and the triple bond of the acetylenicester followed by ring opening of the azaphosphete intermediate. However, in the case of N-vinylic