从乙烯基碳酸乙烯酯和双磺酰甲烷开始,已经完成了一种用于合成高度官能化的环戊烯醇的有效的一锅法。该协议通过顺序钯催化脱羧烯丙基化和氧化环化以操作简单的方式进行。广泛的底物可以很好地适应各种环戊烯醇,以中等至良好的产率和优异的选择性。进一步的对照实验表明,可分离的 ( Z )-烯丙醇(高达Z / E = >19:1)的选择性形成是后续级联氧化环化成功的基础。
Reduction of CO<sub>2</sub> into Methylene Coupled with the Formation of C–S Bonds under NaBH<sub>4</sub>/I<sub>2</sub> System
作者:Zhiqiang Guo、Bo Zhang、Xuehong Wei、Chanjuan Xi
DOI:10.1021/acs.orglett.8b02730
日期:2018.11.2
four-electron reduction of CO2 with thiophenol using NaBH4 as a reductant is described to access dithioacetals. This reaction provides a novel synthetic method for the highly selective conversion of CO2 into methylene, and a new access to molecular structures via formation of C–Sbonds using CO2 as the C1 source.
An efficient, chemoselective homologation of disulfides and diselenides to the corresponding dithio- and diselenoacetals has been developed via the addition of bromomethyllithium. Chemoselectivity is fully preserved in the presence of...
Cs<sub>2</sub>CO<sub>3</sub>-promoted methylene insertion into disulfide bonds using acetone as a methylene source
作者:Qian Chen、Guodian Yu、Xiaofeng Wang、Yulin Huang、Yan Yan、Yanping Huo
DOI:10.1039/c8ob00877a
日期:——
An efficient halogen-free Cs2CO3-promoted methylene insertion into disulfide bonds has been achieved using acetone as a methylene source under mild conditions. This method provides a convenient and practical route to dithioacetals in up to 96% yield with good functional group compatibility.
使用丙酮作为亚甲基源,在温和的条件下,已经实现了有效的无卤素,由Cs 2 CO 3促进的亚甲基插入二硫键的过程。该方法为二硫缩醛的制备提供了便捷实用的途径,产率高达96%,并且具有良好的官能团相容性。