The diastereoselectivesynthesis of anti-homoallylic alcohols bearing conjugated (Z)-enynes through a palladium-catalyzed three-component reaction is described. This reaction features a broad substrate scope, good functional group compatibility, and high levels of (Z)-alkene stereocontrol. In this reaction, Pd(0) functions as a catalyst in two fundamental steps of the tandem sequence: 1) the generation
描述了通过钯催化的三组分反应非对映选择性合成带有共轭 ( Z )-烯炔的抗高烯丙醇。该反应具有底物范围广、官能团相容性好、( Z )-烯烃立体控制水平高的特点。在该反应中,Pd(0) 在串联序列的两个基本步骤中充当催化剂:1) 从双功能连接试剂生成硼化 π-烯丙基钯物种,诱导醛的 umpolung 烯丙基化,以及 2) C( sp 2 )−C( sp ) 交叉耦合。所得产物的进一步转化突出了它们的合成效用。
Asymmetric Synthesis of α-Substituted Allyl Boranes and Their Application in the Synthesis of Iso-agatharesinol
作者:Guang Yu Fang、Varinder K. Aggarwal
DOI:10.1002/anie.200603659
日期:2007.1.8
A New Preparative Method for Allylic Indium(III) Reagents by Reductive Transmetalation of π-Allylpalladium(II) with Indium(I) Salts
transmetalation of the pi-allylpalladium(II) complexes, generated in situ from a catalytic amount of a palladium(0) complex and a variety of allylic substrates, with indium(I) salts proceeded smoothly in various solvents, providing a new route for allylindium(III) reagents.