Transition-Metal-Free Cleavage of C–C Triple Bonds in Aromatic Alkynes with S<sub>8</sub> and Amides Leading to Aryl Thioamides
作者:Kai Xu、Ziyi Li、Fangyuan Cheng、Zhenzhen Zuo、Tao Wang、Mincan Wang、Lantao Liu
DOI:10.1021/acs.orglett.8b00573
日期:2018.4.20
transition-metal-free cleavage reaction of C–C triplebonds in aromatic alkynes with S8 and amides furnishes aryl thioamides in moderate to excellent yields. The remarkable features of this thioamidation include the metal-free cleavage of C–C triple bond, mild reaction conditions, as well as wide substrate scope that is particularly compatible with some internal aromatic alkynes and acetamides.
Aqueous Compatible Protocol to Both Alkyl and Aryl Thioamide Synthesis
作者:Jianpeng Wei、Yiming Li、Xuefeng Jiang
DOI:10.1021/acs.orglett.5b03541
日期:2016.1.15
An efficient aqueous synthesis of thioamides through aldehydes, sodium sulfide, and N-substituted formamides has been developed. Both alkyl and aryl aldehydes are amenable to this protocol. N-Substituted formamides are essential for this transformation. Readily available inorganic salt (sodium sulfide) serves as the sulfur source in water, which makes this method much more practical and efficient.
A general method for one-potsynthesis of thioamides without transition metals or external oxidants is developed through a three-component reaction involving chlorohydrocarbon, amide and elementalsulfur. Both alkyl and aryl thioamides could be obtained in moderate to excellent yields through this protocol. A high tolerance regarding various substituents on chlorohydrocarbon or amide was justified