Air-Tolerant Direct Thiol Esterification with Carboxylic Acids Using Hydrosilane via Simple Inorganic Base Catalysis
作者:Maojie Xuan、Chunlei Lu、Meina Liu、Bo-Lin Lin
DOI:10.1021/acs.joc.9b00500
日期:2019.6.21
thioesterification of carboxylicacids with thiolsusing nontoxic activation agents is highly desirable. Herein, an efficient and practical protocol using safe and inexpensive industrial waste polymethylhydrosiloxane as the activation agent and K3PO4 with 18-crown-6 as a catalyst is described. Various functional groups on carboxylicacid and thiol substituents can be tolerated by the present system to afford thioesters
非常需要使用无毒的活化剂将羧酸与硫醇直接硫酯化。在此,描述了一种有效且实用的方案,该方案使用安全且廉价的工业废聚甲基氢硅氧烷作为活化剂,并以18-crown-6作为催化剂的K 3 PO 4。本系统可以耐受羧酸和硫醇取代基上的各种官能团,从而以19-100%的收率提供硫酯。
Thioimides: New Reagents for Effective Synthesis of Thiolesters from Carboxylic Acids
作者:Adam Henke、Jiri Srogl
DOI:10.1021/jo801319x
日期:2008.10.3
carboxylic acids are used as the precursors for the convenient synthesis of thiolesters in the phosphine mediated process. Cyclic and acyclic thioimides show equal efficiency, furnishing the desired thiolesters in good to excellent yields. The general, highly efficient transformation tolerates various functional groups and the resulting thiolesters are obtained in high purity after a simple separation. The
Intermolecular CO-retained carbothiolation of alkynes using thioesters took place to afford beta-SR substituted enone derivatives; the choice of catalyst (Pd(dba)(2)-dppe) and the introduction of a CF(3) group into the thioesters are the key to achieving the transformation.