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。
Metal-free thioesterification of amides generating acyl thioesters
A base-initiated thioesterification of amides with various thiols is reported. This reaction can take place efficiently under metal-free and air-atmospheric conditions, and provides a facile and practically useful approach to the synthesis of valuable acyl thioesters.
Samarium trifluoromethanesulfonate catalyzed the acylation of phenols, alcohols, thiols, free reducing sugars, and glycosides in excellent yields at ambient temperature undersolvent‐freecondition using stoichiometric amounts of various anhydrides.
Thioesters as Bifunctional Reagents for 2‐Naphthylamine Sulfuracylation
作者:Fuhong Xiao、Shanshan Yuan、Dahan Wang、Saiwen Liu、Huawen Huang、Guo‐Jun Deng
DOI:10.1002/adsc.201900301
日期:2019.7.11
An efficient and convenient strategy for the preparation of diaryl sulfides via a Fe‐promoted direct sulfuracylation of 2‐naphthylamine using thioesters as bifunctional reagents is described. This synthetic strategy features high chemoselectivity, good substrate scope and functional group tolerance.