Reversible P(III)/P(V) Redox: Catalytic Aza-Wittig Reaction for the Synthesis of 4(3<i>H</i>)-Quinazolinones and the Natural Product Vasicinone
作者:Long Wang、Ying Wang、Min Chen、Ming-Wu Ding
DOI:10.1002/adsc.201300950
日期:2014.3.24
The catalytic aza‐Wittig reaction based on a phosphine/phosphine oxide catalytic cycle is reported. The by‐product triphenylphosphine oxide (Ph3PO) was reduced in situ to triphenylphosphine (Ph3P) with good chemselectivity so that the aza‐Wittig reaction can be accomplished by using merely a catalytic amount of triphenylphosphine. The reaction has been demonstrated in an efficient synthesis of 4(3H)‐quinazolinones