Electrochemical Oxidative C—H Sulfenylation of Imidazopyridines with Hydrogen Evolution
作者:Yong Yuan、Yangmin Cao、Jin Qiao、Yueping Lin、Xiaomei Jiang、Yaqing Weng、Shan Tang、Aiwen Lei
DOI:10.1002/cjoc.201800405
日期:2019.1
Selective oxidativeC—H sulfenylation of imidazopyridine heterocycles is achieved using an undivided electrolytic cell. The reaction avoids the use of stoichiometric amount of external chemical oxidant and produces hydrogen gas as the only byproduct. Both aryl and aliphatic thiols demonstrate good reactivity for C—S bond formation.
Aerobic Multicomponent Tandem Synthesis of 3-Sulfenylimidazo[1,2-<i>a</i>]pyridines from Ketones, 2-Aminopyridines, and Disulfides
作者:Wenlei Ge、Xun Zhu、Yunyang Wei
DOI:10.1002/ejoc.201300905
日期:2013.9
reaction was developed for the synthesis of 3-sulfenylimidazo[1,2-a]pyridinesfrom easily available ketones, 2-aminopyridines, and disulfides without DMSO or peroxide as an oxidant. This three-component tandem reaction process involves the formation of imidazo[1,2-a]pyridines followed by Friedel–Crafts sulfenylation in one pot under mild conditions. Both aryl and alkyl ketones afforded the desired products
Iodine-Mediated Multicomponent Synthesis of 3-Sulfenylimidazo[1,2-a]pyridines from 2-Aminopyridines, Ketones, and Sulfonyl Hydrazides
作者:Hongjun Ren、Zhengkai Chen、Sipei Hu、Shiying Du、Yunjie Yao、Zuguang Yang
DOI:10.1055/s-0037-1612082
日期:2019.3
A one-pot multicomponent reaction for the synthesis of 3-sulfenylimidazo[1,2-a]pyridines from readily available 2-aminopyridines, ketones, and sulfonyl hydrazides, mediated by molecular iodine, has been developed. The transformations proceed smoothly with high efficiency and a broad substrate scope, affording the desired heterocyclic products in moderate to excellent yields.
Copper-catalyzed three-component reaction of imidazo[1,2-a]pyridine with elemental sulfur and arylboronic acid to produce sulfenylimidazo[1,2-a]pyridines
Abstract In this work, an efficient copper-catalyzedthree-componentreaction for the synthesis of sulfenylimidazo[1,2-a]pyridines using elemental sulfur as the sulfenylating agents has been developed. The reaction could proceed smoothly with a high degree of functional group tolerance and provide the desired products in moderate to good yield.
TBAI–HBr system mediated generation of various thioethers with benzenesulfonyl chlorides in PEG<sub>400</sub>
作者:Dingyi Wang、Shengmei Guo、Rongxing Zhang、Sen Lin、Zhaohua Yan
DOI:10.1039/c6ra02302a
日期:——
An efficient procedure for the formation of C–S bonds via C–H functionalization was developed for the synthesis of aryl sulfides in good to excellent yields using TBAI–HBr system promoted direct sulfenylation of various compounds, such as phenols, pyrazolones, indoles and related heteroarenes. Low cost and widely available arylsulfonyl chlorides were used as the sulfur source to provide various sulfur-containing