New silicon-phosphorus reagents in organic synthesis. Carbonyl and conjugate addition reactions of silicon phosphite esters and related systems
作者:David A. Evans、Kenneth M. Hurst、James M. Takacs
DOI:10.1021/ja00479a031
日期:1978.5
1,4-addition reactions of organosilicon tervalent phosphorus esters, XlPOSiR3(X = OMe, NMe2, Ph), with saturated and a,@-unsaturated aldehydes and ketones have been studied. These addition reactions have been compared with the complementary reactions of alkyl phosphorus esters, X2POCH3, and R3SiCI with carbonyl substrates. With a,@-un- saturated aldehydes, a judicious choice of reagent and conditions
已经研究了有机硅三价磷酯 XlPOSiR3(X = OMe, NMe2, Ph) 与饱和和 a, 不饱和醛和酮的 1,2- 和 1,4- 加成反应。这些加成反应与烷基磷酯、X2POCH3 和 R3SiCI 与羰基底物的互补反应进行了比较。对于α,@-不饱和醛,明智地选择试剂和条件会导致区域选择性1,2-或1,4-加成模式。已经阐明了这些加成反应的一些机理细节。