Traceless heterocycle synthesis based on transition-metal-catalyzed C-H functionalization is synthetically appealing but has been realized only in monodentate directing systems. Bidentate directing systems allow for the achievement of high catalytic reactivity without the need for a high-cost privileged ligand. The first bidentate directing-enabled, traceless heterocycle synthesis is demonstrated in the
Palladium-Catalyzed CH Oxidation of Isoquinoline N-Oxides: Selective Alkylation with Dialkyl Sulfoxides and Halogenation with Dihalo sulfoxides
作者:Bo Yao、Ren-Jie Song、Yan Liu、Ye-Xiang Xie、Jin-Heng Li、Meng-Ke Wang、Ri-Yuan Tang、Xing-Guo Zhang、Chen-Liang Deng
DOI:10.1002/adsc.201101009
日期:2012.7.9
palladium‐catalyzed CHoxidation of isoquinoline N‐oxides has been developed for regioselectively synthesizing substituted isoquinolines. The method represents the first example of using dialkylsulfoxides as the alkyl sources for the construction of 1‐alkylated isoquinolines. Moreover, the regioselective halogenation of isoquinoline N‐oxides is also successful using dihalosulfoxides as the halide sources
Copper-Catalyzed Domino Three-Component Benzannulation: Access to Isoquinolines
作者:Peng Ma、Yuhang Wang、Jianhui Wang
DOI:10.1021/acs.organomet.2c00195
日期:2022.8.22
We report herein the synthesis of isoquinolines through a copper(I)-catalyzed domino reaction. During this transformation, three molecules of terminal alkynes, 2-bromoaryl aldehydes (ketones), and acetamide react together, in a sequence including Sonogashira coupling, condensation, 6-endo-dig cyclization, elimination of acetic acid, and hydrolysis. In this reaction, isoquinolines with broad functional
Free Amine-Directed Ru(II)-Catalyzed Redox-Neutral [4 + 2] C–H Activation/Annulation of Benzylamines with Sulfoxonium Ylides
作者:Yogesh N. Aher、Amit B. Pawar
DOI:10.1021/acs.joc.2c00931
日期:2022.10.7
An externaloxidantfree Ru(II)-catalyzed C–Hfunctionalization/annulation of primary benzylamines with sulfoxonium ylides has been developed for the synthesis of isoquinolines. The reaction utilizes free amine as a directing group, which is generally considered to be a poor directing group. This work presents the first example of Ru-catalyzed C–Hfunctionalization of benzylamines under redox-neutral