在可能的金氧化还原催化下,炔烃的立体选择性硫代烯丙基化反应效率高(催化剂负载量低至0.1%,产率高达99%),底物范围广(各种炔烃,分子间和分子内方式)。金(I)催化剂既充当炔烃活化的π-酸,又充当Au I / III偶联的氧化还原催化剂,而原位生成的sulf阳离子则起弱氧化剂的作用。这种新颖的方法为金的氧化还原催化提供了令人兴奋的系统,而无需强氧化剂。
Recyclable Gold Catalyst for the Stereoselective Thioallylation of Alkynes
作者:Wenli Hu、Bingbo Niu、Xiaoqiang Xiao、Mingzhong Cai
DOI:10.1021/acs.joc.1c01641
日期:2021.10.1
The heterogeneous gold(I)-catalyzed stereoselective thioallylation of electron-deficient alkynes with allyl sulfides has been achieved by using an MCM-41-immobilized sterically demanding NHC-gold(I) complex [MCM-41-IPrAuNTf2] as the catalyst under mild conditions, delivering a wide variety of stereodefined tri- and tetrasubstituted functionalized vinyl sulfides in good to excellent yields. The new
Aluminum-chloride catalyzed reaction of allylic sulfides with methyl propiolate: A novel addition reaction via an ionic [3.3] sigmatropic rearrangement
The aluminum-chloride catalyzed reaction of allylic sulfides with methyl propiolate resulted in the clean formation of novel 1:1 adducts via ionic [3.3] sigmatropic rearrangements.