Rhodium-Catalyzed Annulative Coupling Using Vinylene Carbonate as an Oxidizing Acetylene Surrogate
作者:Koushik Ghosh、Yuji Nishii、Masahiro Miura
DOI:10.1021/acscatal.9b04254
日期:2019.12.6
Transition-metal-catalyzed C–Hactivation and subsequent oxidative cyclization with alkynes has been a powerful tool for the synthesis of polycyclic aromatic compounds. Despite the substantial progress in this field, it is still a significant challenge to establish synthetic methodologies for the construction of nonsubstituted vinylene-fused aromatics. We herein report a Rh(III)-catalyzed C–H/N–H annulation with vinylene
Copper-Catalyzed Construction of Benzo[4,5]imidazo[2,1-<i>a</i>]isoquinolines Using Calcium Carbide as a Solid Alkyne Source
作者:Haiyan Liu、Zheng Li
DOI:10.1021/acs.orglett.1c03133
日期:2021.11.5
cross-coupling/nucleophilic addition tandem reactions usingcalciumcarbide as a solidalkynesource, 2-(2-bromophenyl)benzimidazoles as starting materials, and copper as a catalyst is described. The target products can also be synthesized through one-pot three-component reactions of o-phenylenediamines, o-bromobenzaldehydes, and calciumcarbide. Both reaction routes can also be scaled up to gram scale
一种以碳化钙为固体炔烃源,2-(2-溴苯基)苯并咪唑为原料,通过Sonogashira交叉偶联/亲核加成串联反应合成苯并[4,5]咪唑并[2,1- a ]异喹啉的方法材料,并描述了铜作为催化剂。目标产物还可以通过单罐三组分反应合成ö苯二胺类,ø -bromobenzaldehydes,和电石。两种反应路线也可以放大到克级。
Palladium-Catalyzed Oxidative Intramolecular CC Bond Formation via Double sp2 CH Activation between the 2-Position of Imidazoles and a Benzene Ring
作者:Manman Sun、Huandong Wu、Junnan Zheng、Weiliang Bao
DOI:10.1002/adsc.201100801
日期:2012.3.16
Oxidative intramolecularCCbond formation via double sp2 CHactivation between the 2‐position of imidazoles and a benzene ring catalyzed by palladium(II) has been developed, which provides an atom‐economical, concise and efficient methodology to synthesize imidazole‐ or benzimidazole‐fused isoquinoline polyheteroaromatic compounds.