Unprecedented alkylation of silicon enolates with alcohols via carbenium ion formations catalyzed by tin hydroxide-embedded montmorillonite
作者:Michael Andreas Tandiary、Masashi Asano、Taiki Hattori、Satoshi Takehira、Yoichi Masui、Makoto Onaka
DOI:10.1016/j.tetlet.2017.03.073
日期:2017.5
The solid acid, tin hydroxide-embedded montmorillonite, catalyzes the unprecedentedalkylation of various silicon enolates with primary, secondary and tertiary benzylic alcohols as well as secondary allylic alcohols. The acid catalysis of Sn-Mont was not only higher than that of the other ion-exchanged montmorillonites (M-Mont; M = H, Ti, Fe and Al), but also higher than that of the typical homogeneous
固体酸,氢氧化锡包埋的蒙脱石可催化各种烯醇硅与伯,仲和叔苄醇以及仲烯丙基醇的空前烷基化。Sn-Mont的酸催化作用不仅高于其他离子交换的蒙脱土(M-Mont; M = H,Ti,Fe和Al),而且高于典型的均相酸催化剂(如BF)3 ·OEt 2,TMSOTf和TfOH。
Lewis acid promoted ene-like reactions of enol ethers with aldehydes
Use of organoaluminum reagents induces ene-like reactions of enol silyl ethers with aldehydes, and enols having bulky silyl groups selectively afforded syn adducts.
Preparation of -butyldimethylsilyl (tbdms) enol ethers using potassium hydride in the presence of tbdms chloride
作者:John Orban、John V. Turner、Bruce Twitchin
DOI:10.1016/s0040-4039(01)91129-3
日期:1984.1
TBDMS enolethers can be readily prepared regio- and stereoselectively under equilibrating conditions in high yield by adding potassiumhydride to a THF solution of ketone with TBDMS chloride in situ.
The Michael adducts are obtained with good to excellent ul selectivity by treating silyl enol ethers with α,β-unsaturated ketones in the presence of a catalytic amount of tritylperchlorate.
通过在催化量的高氯酸三苯甲基酯存在下用 α,β-不饱和酮处理甲硅烷基烯醇醚,以良好至极好的 ul 选择性获得迈克尔加合物。