氨基锡(II和IV)化合物{[((2,6- i -Pr-C 6 H 3)(H)N]-μ-(Sn)-Cl} 2,{2-[((CH 3)2 NCH 2 ] C 6 H 4 } 2 Sn [N(H)(2,6- i -Pr-C 6 H 3)] 2和{2-[(CH 3)2 NCH 2 ] C 6 H 4 } Sn [N (2,6- i -Pr-C 6 H 3)(SiMe 3)]通过从卤化锡和相应的锂络合物中消除卤化锂来制备。[(2,6- i -Pr-C 6 H 3)(H)N] Li(1)与一半摩尔当量的SnCl 2反应,得到{[(2,6- i -Pr-C 6 H 3 3)(H)N]-μ-(Sn)-Cl} 2。相同的氨基酰胺锂(1)具有R 3 SnCl相应的氨基锡烷。这些化合物与正丁基锂的进一步反应得到起始物1和四有机锡烷。{2-[((CH 3)2 NCH 2 ] C 6 H4 } 2 SnBr 2与1-
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。
Trialkylborane-Mediated Propargylation of Aldehydes Using γ-Stannylated Propargyl Acetates
A transition-metal-free three-component process that combines aldehydes, 3-(tributylstannyl)propargyl acetates formed in situ from readily available propargyl acetates, and trialkylboranes provides access to a range of 1,2,4-trisubstituted homopropargylic alcohols. The addition of diisopropylamine plays a crucial role in the selective formation of homopropargylic alcohols. Importantly, this methodology