Solvent-Free Conversion of Thioamides to Thioesters
摘要:
[image omitted] Diverse thioesters were efficiently prepared via the solvent-free reaction of thioamide derivatives with alkyl halides in the presence of catalytic amounts of 1,4-diazabicyclo[2.2.2]octane (DABCO) in small quantities of water and in good to excellent yields.
One-pot synthesis of thioesters with sodium thiosulfate as a sulfur surrogate under transition metal-free conditions
作者:Yen-Sen Liao、Chien-Fu Liang
DOI:10.1039/c8ob00178b
日期:——
In this paper, we report an efficient synthetic method for thioester formation fromsodium thiosulfate pentahydrate, organic halides, and aryl anhydrides. In the one-pot two-step reactions developed in this study, sodium thiosulfate was used as the sulfur surrogate for acylation with anhydrides, followed by substitution with organic halides through the in situ generation of thioaroylate. Furthermore
An Odorless, One-Pot Synthesis of Thioesters from Organic Halides, Thiourea and Benzoyl Chlorides in Water
作者:Guo-ping Lu、Chun Cai
DOI:10.1002/adsc.201201059
日期:2013.5.3
Thioesterification can be realized via an odorless, one‐pot reaction through the in situ generation of S‐alkylisothiouronium salts from organic halides and thiourea in aqueous Triton X‐100 (TX100) micelles. The protocol is free of foul‐smell thiols and organic solvents, and operates under mild conditions, thereby offering considerable potential for applications in organic synthesis.
A one-stepconversion of alcohols into thioesters under solvent-free conditions is reported. The alcohols were reacted with primary thioamides in the presence of p-toluenesulfonic acid under solvent-free conditions to produce the corresponding thioesters in good to excellent yields.
Thioesters were efficiently prepared via the direct reaction of tertiary thioamides and alkyl halides in water, and in the presence of catalytic amounts of NaI, hexadecyltrimethylammonium bromide (HTAB), and 1,4-diazabicyclo[2.2.2]octane (DABCO). Hence, thioamides smoothly undergo an S-alkylation with alkyl halides in aqueous media following by hydrolysis to afford the corresponding thioesters in very good to excellent yields.