Selective transformations of 2-(p-toluenesulfonyl)-N-tosylhydrazones to substituted 1,2,3-thiadiazoles
作者:Yijiao Feng、Jing He、Weiwei Li、Zhen Yang、Yueting Wei、Ping Liu、Jixing Zhao、Chengzhi Gu、Wenli Wang
DOI:10.1016/j.tet.2020.131803
日期:2021.1
Selectivetransformations of 2-(p-toluenesulfonyl)-N-tosylhydrazones with different sulfur sources have been established. A series of 4-aryl-1,2,3-thiadiazoles and novel 4-aryl-5-tosyl-1,2,3-thiadiazoles were selectively constructed by the adjustment of reaction conditions. These protocols feature short reaction time, good compatibility of functional group, easily available materials, and good selectivity
A three-component cascade cyclization catalyzed by copper was employed to synthesize quinoline-4-thiols using easily available diaryliodonium salts, alkynyl sulfides, and nitriles as starting materials. Sulfur atoms play an important role in controlling the regioselectivity, by stabilizing the high-valent vinyl copper intermediate. Meanwhile, the sulfide group at position 4 of quinoline could be further
The efficient synthesis of γ-thiapyrones by a base-mediated Diels–Alder/retro-Diels–Alder reaction of α-pyrones with 5-H-1,2,3-thiadiazoles is reported herein. Thioketenes in situ generated from thiadiazoles as electron-poor dienophile and electron-rich 4-hydroxy-2-pyrones as dienes are conjunctively transformed into a series of γ-thiapyrones with broad functional group compatibility in good to excellent