Aqueous microwave assisted novel synthesis of isothiocyanates by amine catalyzed thionation of isocyanides with Lawesson's reagent
作者:Sodeeq Aderotimi Salami、Vincent J. Smith、Rui W. M. Krause
DOI:10.1080/17415993.2022.2164196
日期:——
A green and sustainable chemistry approach for organic synthesis is described here, which involves microwave exposure of reactants in the presence of water. A general, practical, and highly efficient protocol for the preparation of a broad range of functionalized isothiocyanates has been developed from their corresponding isocyanides using Lawesson's reagent and catalytic amount of amine bases, particularly
这里描述了一种用于有机合成的绿色和可持续化学方法,它涉及反应物在水存在下的微波暴露。使用 Lawesson 试剂和催化量的胺碱,特别是微波辐射条件下的三乙胺,从相应的异氰酸酯开发了一种通用、实用且高效的方案,用于制备各种功能化异硫氰酸酯。与使用有毒或挥发性亲电子液体(硫光气、其衍生物或 CS 2). 此外,为了比较,这些化合物也通过常规加热程序合成。通过比较总反应时间和产率百分比,对常规合成和微波辅助合成进行了比较。结果表明,微波辅助合成可在非常短的反应时间内实现更高的产率。 在三乙胺存在下,在常规和微波加热条件下,使用 Lawesson 试剂从异氰化物到异硫氰酸酯。