通过在温和条件下用 HI 和 DMSO 水溶液直接碘硫甲基化炔烃,开发了一种方便有效的 ( E )-2-iodo-3-(甲硫基)丙烯酸酯方法。这种新颖的协议证明了缺电子炔烃的独特双功能化,具有广泛的底物范围和出色的官能团耐受性。初步机理研究表明,先对炔烃进行二碘化,然后用原位产生的 DMS 进行亲核取代,导致形成 ( E )-2-iodo-3-(methylthio) 丙烯酸酯。
protocol for the synthesis of Z-vinyl thiocyanates through ultrasound-promoted Brønstedacid ionic liquid-catalyzed hydrothiocyanation of activated alkynes under minimal solvent conditions has been developed. This process effectively avoids the use of organic solvents, metal catalysts and harsh reactionconditions. This reaction shows attractive characteristics such as operational simplicity, broad substrate
Sustainable routes for quantitative green selenocyanation of activated alkynes
作者:Ling-Hui Lu、Zheng Wang、Weng Xia、Ping Cheng、Bo Zhang、Zhong Cao、Wei-Min He
DOI:10.1016/j.cclet.2019.04.033
日期:2019.6
Most organic reactions require the usage of volatile organic compounds in the synthesis, work-up and purification processes, thus resulting in major environmental pollution and high manufacturing cost. By using cheap biomass lactic acid as the reaction media and catalyst, a sustainable protocol for the synthesis of Z-3-selenocyanatoacrylates and analogues through green selenocyanation of activated alkynes has been achieved. A principal advantage of this protocol is that the usage of organic volatile compounds can be avoided entirely, as the conversion of substrate is almost quantitative or quantitative with a minimal amount of lactic acid employed as reaction media, and the pure products can be conveniently collected through water precipitation. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.