Visible-light promoted dithioacetalization of aldehydes with thiols under aerobic and photocatalyst-free conditions
作者:Zhimin Xing、Mingyang Yang、Haiyu Sun、Zemin Wang、Peng Chen、Lin Liu、Xiaolei Wang、Xingang Xie、Xuegong She
DOI:10.1039/c8gc02237b
日期:——
A novel photocatalyst-free visible-light-mediated dithioacetalization of aldehydes and thiols has been developed.
一种新型的无光催化剂可见光介导的醛和硫醇的二硫缩合反应已经被开发。
A Facile Mild Deprotection Protocol for 1,3-Dithianes and 1,3-Dithiolanes with 30% Hydrogen Peroxide and Iodine Catalyst in Aqueous Micellar System
作者:Nemai Ganguly、Sujoy Barik
DOI:10.1055/s-0028-1088023
日期:2009.4
A simple clean expeditious protocol for the deprotection of 1,3-dithianes and 1,3-dithiolanes has been developed using 30% aqueous hydrogen peroxide activated by iodine catalyst (5 mol%) in water in the presence of sodium dodecyl sulfate (SDS) under essentially neutral conditions. The method showed tolerance for a number of phenol protecting groups such as allyl, benzyl, TBDMS, TBDPS ethers, phenolic
Efficient Copper‐Catalyzed Highly Stereoselective Synthesis of Unprotected
<i>C</i>
‐Acyl Manno‐, Rhamno‐ and Lyxopyranosides
作者:Gordon Jacob Boehlich、Hannes Sterzel、Julia Rehbein、Nina Schützenmeister
DOI:10.1002/chem.202202619
日期:2022.12.20
Just a pinch of copper iodide promotes the reaction of manno-type glycosyl iodides with lithiated dithianes. Herein, we report an efficient and highly α-selective four-step one-pot method for the synthesis of unprotected manno-type C-acyl pyranosides. The crucial role of the catalyst was proven by mechanistic studies and DFT calculations, suggesting a copper-radical mechanism over a SN-type mechanism
只需一小撮碘化铜即可促进甘露型糖基碘化物与锂化二噻烷的反应。在此,我们报告了一种高效且高 α 选择性的四步一锅法,用于合成无保护的甘露型C-酰基吡喃糖苷。催化剂的关键作用已通过机理研究和 DFT 计算得到证明,表明铜自由基机理优于 S N型机理。
Jin, Yong-Sheng; Zhang, Wei; Zhang, Da-Zhi, Asian Journal of Chemistry, 2011, vol. 23, # 3, p. 1117 - 1119