A Convoluted Polyvinylpyridine‐Palladium Catalyst for Suzuki‐Miyaura Coupling and C−H Arylation
作者:Aya Ohno、Takuma Sato、Toshiaki Mase、Yasuhiro Uozumi、Yoichi M. A. Yamada
DOI:10.1002/adsc.202000742
日期:2020.11.4
and reusablesupportedcatalysts for Suzuki‐Miyaura coupling and catalytic C−H arylation is important for fundamental and applied chemistry, with these reactions being used to produce medical compounds and functional materials. Herein, we found that a mesoporous composite made of a linear poly(4‐vinylpyridine) and tetrachloropalladate acted as a dual‐mode catalyst for a variety of cross‐coupling reactions
Palladium-Catalyzed Synthesis of 2,3-Disubstituted Benzothiophenes via the Annulation of Aryl Sulfides with Alkynes
作者:Yoshihiro Masuya、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/acs.orglett.6b02055
日期:2016.9.2
A new method has been developed for the synthesis of 2,3-disubstituted benzothiophenes involving the palladium-catalyzed annulation of arylsulfides with alkynes. This convergent approach exhibited good functional group tolerance, providing rapid access to a diverse array of derivatives from simple, readily available starting materials. This protocol can also be used to synthesize 2-silyl-substituted
A potassium hydroxide/dimethyl sulfoxide (KOH/DMSO) superbase‐promoted method for the synthesis of 2‐substituted benzothiophenes has been developed via photoinduced intermolecular annulation of 2‐halothioanisoles with terminal alkynes at ambient temperature. The present protocol uses commercially available 2‐halothioanisoles as substrates and visible light as energy force, which offers a wide range
Nickel-catalyzed and Li-mediated regiospecific C–H arylation of benzothiophenes
作者:Yorck Mohr、Gaëlle Hisler、Léonie Grousset、Yoann Roux、Elsje Alessandra Quadrelli、Florian M. Wisser、Jérôme Canivet
DOI:10.1039/d0gc00917b
日期:——
A nickel-based catalytic system for the regiospecific C2–H arylation of benzothiophene has been established. NiCl2(bpy) is used as a catalyst in combination with LiHMDS as a base in dioxane. The catalytic system is applicable to a variety of functionalized benzothiophenes, as well as other heteroarenes including thiophene, benzodithiophene, benzofuran and selenophene in combination with iodo aryl electrophiles
Novel phenyl migration of 1-phenylbenzo[b]thiophenium triflates in the thermolysis
作者:Tsugio Kitamura、Bian-Xiang Zhang、Yuzo Fujiwara
DOI:10.1016/s0040-4039(02)00216-2
日期:2002.3
Thermolysis of 1-phenylbenzo[b]thiophenium triflates at 180°C causes phenyl migration to give 2-phenylbenzo[b]thiophenes in high yields. Interestingly, the thermolysis of 1-phenylbenzo[b]thiophenium triflates having a substituent at the 2 position affords the corresponding 3-phenylbenzo[b]thiophenes. On the basis of the thermolysis of 2-(4-methylphenyl)-1-phenylbenzo[b]thiophenium triflate, a consecutive
1-苯基苯并[ b ]噻吩三氟甲磺酸盐在180℃下的热分解导致苯基迁移,从而以高收率得到2-苯基苯并[ b ]噻吩。有趣的是,在2位具有取代基的1-苯基苯并[ b ]噻吩三氟甲磺酸酯的热解得到相应的3-苯基苯并[ b ]噻吩。基于2-(4-甲基苯基)-1-苯基苯并[ b ]噻吩鎓三氟甲磺酸酯的热解,提出了连续的[1,5]σ重排用于苯基迁移。