Catalytic C−H Bond Functionalization with Palladium(II): Aerobic Oxidative Annulations of Indoles
摘要:
A palladium-catalyzed aerobic oxidative annulation of indoles is described. We have demonstrated that a variety of factors influence these cyclizations, and in particular the electronic nature of the pyridine ligand is crucial. It is also remarkable that these oxidative cyclizations can proceed in good yield despite background oxidative decomposition pathways, testament to the facile nature with which molecular oxygen can serve as the direct oxidant for Pd(0). We have also shown that the mechanism most likely involves initial indole palladation (formal C-H bond activation) followed by migratory insertion and beta-hydrogen elimination.
Catalytic C−H Bond Functionalization with Palladium(II): Aerobic Oxidative Annulations of Indoles
摘要:
A palladium-catalyzed aerobic oxidative annulation of indoles is described. We have demonstrated that a variety of factors influence these cyclizations, and in particular the electronic nature of the pyridine ligand is crucial. It is also remarkable that these oxidative cyclizations can proceed in good yield despite background oxidative decomposition pathways, testament to the facile nature with which molecular oxygen can serve as the direct oxidant for Pd(0). We have also shown that the mechanism most likely involves initial indole palladation (formal C-H bond activation) followed by migratory insertion and beta-hydrogen elimination.
Enantioselective Fujiwara-Moritani Indole and Pyrrole Annulations Catalyzed by Chiral Palladium(II)-NicOx Complexes
作者:Julia A. Schiffner、Thorsten H. Wöste、Martin Oestreich
DOI:10.1002/ejoc.200901129
日期:2010.1
catalytic asymmetric Fujiwara-Moritani ring closures of several indole- and pyrrole-based cyclization precursors are reported. These unprecedented oxidative palladium(II)-catalyzed annulations allow for the formation of a stereogenic quaternary carbon atom, and decent levels of enantiocontrol are seen in 5-exo-trig cyclizations (54 % ee for an indole and 76 % ee for a pyrrole) while 6-exo-trig ring
Certain 1-indolylalkyl-4-(alkoxypyrimidinyl) piperazines are useful antidepressant compounds.
某些 1-吲哚烷基-4-(烷氧基嘧啶基)哌嗪是有用的抗抑郁化合物。
US5077293A
申请人:——
公开号:US5077293A
公开(公告)日:1991-12-31
Catalytic C−H Bond Functionalization with Palladium(II): Aerobic Oxidative Annulations of Indoles
作者:Eric M. Ferreira、Brian M. Stoltz
DOI:10.1021/ja035054y
日期:2003.8.1
A palladium-catalyzed aerobic oxidative annulation of indoles is described. We have demonstrated that a variety of factors influence these cyclizations, and in particular the electronic nature of the pyridine ligand is crucial. It is also remarkable that these oxidative cyclizations can proceed in good yield despite background oxidative decomposition pathways, testament to the facile nature with which molecular oxygen can serve as the direct oxidant for Pd(0). We have also shown that the mechanism most likely involves initial indole palladation (formal C-H bond activation) followed by migratory insertion and beta-hydrogen elimination.