Catalyst-Controlled Regiodivergent Alkyne Insertion in the Context of C−H Activation and Diels-Alder Reactions: Synthesis of Fused and Bridged Cycles
作者:Xukai Zhou、Yupeng Pan、Xingwei Li
DOI:10.1002/anie.201704036
日期:2017.7.3
Rhodium(III)- and cobalt(III)-catalyzed C−Hactivation of indoles and coupling with 1,6-enynes is discussed. Under rhodium(III) catalysis, the alkyne insertion follows 2,1-regioselectivity with a subsequent type-I intramolecular Diels–Alder reaction (IMDA) to afford [6,5]-fused cycles. When catalyzed by the cobalt(III) congener, 1,2-insertion of the alkyne is preferred, and followed by a rare type-II
Iridium(III)-Catalyzed Regiocontrolled Direct Amidation of Isoquinolones and Pyridones
作者:Debapratim Das、Rajarshi Samanta
DOI:10.1002/adsc.201701244
日期:2018.1.17
Iridium(III)‐catalyzed highly regiocontrolled C3/C8 amidation of isoquinolones and C6 amidation of 2‐pyridones has been successfully accomplished with various azides. The optimized method is operationally simple with a broad substrate scope. The protocol has been found to be scalable.
The C-H indolation of heteroarenes was realized using the benziodoxolone hypervalent iodine reagents indoleBXs. Functionalization of the C-H bond in bipyridinones and quinoline N-oxides catalyzed by a rhodium complex allowed to incorporate indole rings into aza-heteroaromatic compounds. These new transformations displayed complete regioselectivity for the C-6 position of bipyridinones and the C-8 position
Rh(I)‐Catalyzed Direct C6−H Arylation of 2‐Pyridones with Aryl Carboxylic Acids
作者:Haoqiang Zhao、Jianbin Xu、Xin Xu、Yixiao Pan、Zexin Yu、Lijin Xu、Qinghua Fan、Patrick J. Walsh
DOI:10.1002/adsc.202100596
日期:2021.8.13
Rh(I)-catalyzed C6-selective C−H arylation of 2-pyridones with inexpensive, readily available, safe and structurally diverse aryl carboxylic acids with the aid of a pyridine directing group is developed. This decarbonylative arylation protocol features an easy-to-handle catalytic system, and is amenable to diversely substituted 2-pyridones and aryl carboxylic acids. It allows access to a wide range
Access to Structurally Diverse Quinoline-Fused Heterocycles via Rhodium(III)-Catalyzed C–C/C–N Coupling of Bifunctional Substrates
作者:Songjie Yu、Yunyun Li、Xukai Zhou、He Wang、Lingheng Kong、Xingwei Li
DOI:10.1021/acs.orglett.6b01032
日期:2016.6.17
Rhodium(III)-catalyzed C–H activation of heteroarenes and functionalization with bifunctional substrates such as anthranils allows facile construction of quinoline-fused heterocycles under redox-neutral conditions. The couplings feature broad substrate scope and provide step-economical access to two classes of quinoline-fused condensed heterocycles.