Regioselective and stereoselective sulfonylation of alkynylcarbonyl compounds in water
作者:Wenyi Li、Guoxing Yin、Lei Huang、Yan Xiao、Zhimin Fu、Xiu Xin、Fang Liu、Zhizhang Li、Weimin He
DOI:10.1039/c6gc01196a
日期:——
A simple and efficient route for the synthesis of Z-[small beta]-sulfonyl-[small alpha],[small beta]-unsaturated carbonylcompounds by using water as the solvent and hydrogen source is developed.
Water‐promoted sulfonylation of propargyl esters leading to highly regioselective and stereoselective formation of (Z)‐β‐sulfonyl enoates in excellent yields, by a simple, mild, rapid and environmentally benign reaction procedure is reported.
Regio- and Stereoselective Hydrosulfonylation of Electron-Deficient Alkynes: Access to Both E- and Z-β-Sulfonyl-α,β-Unsaturated Carbonyl Compounds
作者:Wei Zhang、Gabriel M. Johnson、Zhi Guan、Yan-Hong He
DOI:10.1002/adsc.201801032
日期:2018.12.3
sulfinic acids to access both E‐ and Z‐β‐sulfonyl‐α,β‐unsaturated carbonyl compounds has been developed. We propose that this reaction via a hydroxylallene intermediate delivers the thermodynamically stable E isomer, or via a concerted termolecular AdE3 mechanism affords Z isomer. The stereoselectivity of addition (syn or anti) can be controlled by varying the sulfonyl sources and acidic buffer solutions
已经开发出一种电子不足的炔烃,通过亚磺酸钠或亚磺酸进行无金属的氢磺酰化反应,以同时获得E-和Z - β-磺酰基-α,β-不饱和羰基化合物。我们建议该反应通过羟基丙二烯中间体传递热力学稳定的E异构体,或通过一致的分子Ad E 3机理提供Z异构体。加成的立体选择性(合成或反合成)可以通过改变磺酰基来源和酸性缓冲溶液来控制。该协议展示了内部或末端炔烃的广泛底物范围,包括各种取代的炔酮和炔基酯。这种方法温和,高效,操作简单且易于扩展。
One-pot synthesis of (Z)-β-sulfonyl enoates from ethyl propiolate
作者:C. Wade Downey、Smaranda Craciun、Ana M. Neferu、Christina A. Vivelo、Carly J. Mueller、Brian C. Southall、Stephanie Corsi、Eric W. Etchill、Ryan J. Sault
DOI:10.1016/j.tetlet.2012.08.051
日期:2012.10
β-Sulfonyl enoates may be synthesized through a one-pot two-step sequence from ethylpropiolate with good to excellent selectivity for the Z isomer. Trialkylamines catalyze thioconjugate additions of aryl thiols, and alkoxides catalyze the addition of aliphatic thiols. Addition of meta-chloroperbenzoic acid (mCPBA) and LiClO4 to the reaction mixture provides rapid access to the sulfonyl enoates. Yields