Selective synthesis of aryl thioamides and aryl-alpha-ketoamides from alpha-oxocarboxylic acids and tetraalkylthiuram disulfides: an unexpected chemoselectivity from aryl sulfonyl chlorides

摘要

Aryl sulfonyl chloride-controlled generation of aryl thioamides and aromatic alpha-ketoamides through basepromoted decarboxylative functionalization of alpha-oxocarboxylic acids with tetraalkylthiuram disulfides has been established. The diverse formation of these two products could be controlled by the addition of tosyl chloride in different solvents. This protocol is compatible with a variety of electron-donating and electron-withdrawing functional groups and provides an attractive means to produce aryl thioamides and aromatic alpha-ketoamides with moderate to excellent yields.