This work describes the first Pd-catalyzed allylic alkylation of thioamides. Various thioamides were efficiently alpha-allylated in high yields and with excellent selectivity for monoallylation under mild reaction conditions. The process not only provides a facile method for the synthesis of functionalized thioamides, but also presents a useful transformation for synthetically important thioamides. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of Substituted Thioamides from <i>gem</i>
-Dibromoalkenes and Sodiumsulfide
作者:Ashok K. Morri、Yadagiri Thummala、Ramesh Adepu、Gangavaram V. M. Sharma、Subhash Ghosh、Venkata Ramana Doddi
DOI:10.1002/ejoc.201901411
日期:2019.11.14
Synthesis of thioamides from geminal dibromoalkenes, sodium sulfide and formamide have been reported under catalyst or additive free conditions. Control experiment and mechanistic studies revealed that necessary role of sodium sulfide in this overall transformation.
An efficient decarboxylative thioamidation of arylacetic and cinnamic acids has been developed employing formamides as amine surrogate and sulfur as promoter. Thioamides with variant structural features are obtained under mild reaction conditions without the use of transition metal catalysts and oxidants.