The Homocoupling of Arylsulfonylhydrazides by Palladium-Catalysed Desulfonation in Air
摘要:
A simple and efficient preparation of biaryl derivatives from arylsulfonyl hydrazides has been developed using Pd(OAc)(2) as the catalyst in a mixed solvent of DMA and THF and without the use of any ligand and base.
A highly efficient sulfonylation of thiols has been achieved through the metal-free NaI/TBHP-mediated cross-coupling of sulfonyl hydrazides and thiols at roomtemperature. This method provides a convenient and practical route to thiosulfonates in 84–99% yields (39 examples) with wide functional group compatibility.
Photo‐Mediated Decarboxylative Ketonization of Atropic Acids with Sulfonyl Hydrazides: Direct Access to
<i>β</i>
‐Ketosulfones
作者:Jie Chen、Zoe G. Allyson、Jing‐Rui Xin、Zhi Guan、Yan‐Hong He
DOI:10.1002/adsc.201901525
日期:2020.5.12
synthetically and biologically relevant β‐ketosulfones via a photo‐mediated decarboxylative ketonization of atropic acids was disclosed. The approach features metal‐free conditions, good functional group compatibility, readily available starting materials and the use of ubiquitous dioxygen as both oxygen source and oxidant. Furthermore, mechanistic studies reveal that the decarboxylative ketonization
Iodine-catalyzed sulfonylation of sulfonyl hydrazides with <i>tert</i>-amines: a green and efficient protocol for the synthesis of sulfonamides
作者:Jinyang Chen、Xiaoran Han、Lan Mei、Jinchuan Liu、Kui Du、Tuanwu Cao、Qiang Li
DOI:10.1039/c9ra07361b
日期:——
This study provides a direct, sustainable and eco-friendly method for the synthesis of various sulfonamides via the sulfonylation of sulfonyl hydrazides with tert-amines. The method utilizes sulfonyl hydrazides to oxidize and couple with tertiary amines through selective cleavage of C–N bonds. In this reaction, molecular iodine was used as the catalyst and t-butyl hydroperoxide was used as the oxidant