Transition-Metal-Free Method for the Synthesis of Benzo[b]thiophenes from o-Halovinylbenzenes and K2S via Direct SNAr-Type Reaction, Cyclization, and Dehydrogenation Process
摘要:
A new, highly efficient procedure for the synthesis of benzothiophenes from easily available o-halovinylbenzenes and potassium sulfide has been developed. The reaction tolerated a wide range of functionalities, and various 2-substituted benzo[b]thiophenes are provided in the high yields in the absence of a transition-metal catalyst.
Three-component 2-aryl substituted benzothiophene formation under transition-metal free conditions
作者:Pengcheng Jiang、Xingzong Che、Yunfeng Liao、Huawen Huang、Guo-Jun Deng
DOI:10.1039/c6ra07730g
日期:——
A base-mediated 2-aryl substituted benzothiopheneformation from 2-bromobenzene aldehydes, benzylic esters and elemental sulfur under transition-metal-free conditions is described. Various 2-aryl substituted benzothiophene were efficiently obtained under mild conditions.
Copper-Catalyzed Synthesis of Benzo[<i>b</i>]thiophenes and Benzothiazoles Using Thiocarboxylic Acids as a Coupling Partner
作者:Hui Yu、Meishu Zhang、Yuzhe Li
DOI:10.1021/jo401353w
日期:2013.9.6
copper-catalyzed approach to benzo[b]thiophene and benzothiazole derivatives using thiocarboxylic acids as a sulfur source has been developed. In the presence of CuI and 1,10-phen, and n-Pr3N as the base, (2-iodobenzyl)triphenylphosphonium bromide and (2-iodophenylimino)triphenylphosphorane reacted smoothly with thiocarboxylic acids to give benzo[b]thiophene and benzothiazole derivatives in good yields via
已经开发出一种有效的铜催化方法,以硫代羧酸作为硫源,用于苯并[ b ]噻吩和苯并噻唑衍生物。在CuI和1,10-phen和n -Pr 3 N为碱的情况下,(2-碘苄基)三苯基溴化and和(2-碘苯基亚氨基)三苯基phosph与硫代羧酸平稳反应,生成苯并[ b ]噻吩和苯并噻唑通过顺序的Ullmann型C–S键耦合和Wittig缩合,可以得到高收率的衍生物。
Reaction pathways for the cyclization of ortho-thioalkyl and ortho-thioaryl substituted phenyl radicals with alkynes. Reaction of o-methylthioarenediazonium tetrafluoroborates with alkynes to give 2-substituted benzo[b]thiophenes
An easily effected aromatic annelation is described involving reaction of O-thioalkyl and O-thioaryl substitutedPhenylradicals with alkynes to give2-substitutedbenzo[b]thiophenes; the mechanism is discussed.
描述了一种易于实现的芳族芳构化反应,该过程涉及O-硫代烷基和O-硫代芳基取代的苯基与炔烃的反应,生成2-取代的苯并[ b ]噻吩;讨论了该机制。
LEARDINI, R.;PEDULLI, G. F.;TUNDO, A.;ZANARDI, G., J. CHEM. SOC. CHEM. COMMUN., 1985, N 20, 1390-1391
作者:LEARDINI, R.、PEDULLI, G. F.、TUNDO, A.、ZANARDI, G.