Syntheses of α,β-Unsaturated Carbonyl Compounds from the Reactions of Monosubstituted Ozonides with Stable Phosphonium Ylides
作者:Yung-Son Hon、Ling Lu、Rong-Chi Chang、Sheng-Wun Lin、Pei-Pei Sun、Chia-Fu Lee
DOI:10.1016/s0040-4020(00)00903-0
日期:2000.11
Ozonides derived from terminal alkenes reacted with 1.3 mol equiv. of stable phosphonium ylides to give (E)-α,β-unsaturated carbonyl compounds in good to excellent yields. No reducing agent is needed in the reaction. However, alkoxyalkyl-substituted ozonides afforded a mixture of (Z)- and (E)-α,β-unsaturated carbonyl compounds under similar condition. The E/Z isomeric ratio is affected by the position
衍生自末端烯烃的臭氧与1.3摩尔当量反应。稳定的叶立德phospho以良好至极好的收率得到(E)-α,β-不饱和羰基化合物。反应中不需要还原剂。然而,烷氧基烷基取代的臭氧化物在相似条件下得到(Z)-和(E)-α,β-不饱和羰基化合物的混合物。所述ë / ž异构体比率是由杂原子中的臭氧化物的取代基的位置的影响。将讨论该反应的可能机理。