Palladium-Catalyzed Decarboxylative Couplings of 2-(2-Azaaryl)acetates with Aryl Halides and Triflates
作者:Rui Shang、Zhi-Wei Yang、Yan Wang、Song-Lin Zhang、Lei Liu
DOI:10.1021/ja107103b
日期:2010.10.20
Pd-catalyzed decarboxylative cross-couplings of 2-(2-azaaryl)acetates with arylhalides and triflates have been discovered. This reaction is potentially useful for the synthesis of some functionalized pyridines, quinolines, pyrazines, benzoxazoles, and benzothiazoles. Theoretical analysis shows that the nitrogen atom at the 2-position of the heteroaromatics directly coordinates to Pd(II) in the decarboxylation
Rh(I)-catalyzed asymmetric approach for the intermolecular functionalization of C(sp3)–H bonds is reported. For the first time, unsymmetrical N-heterocyclic carbenes (NHCs) were used for asymmetric catalysis that is capable of achieving not only high site-selectivity but also enantioselectivity. The Rh(I)/NHC* catalytic systems were applied to asymmetric directC(sp3)–Harylation, which provides a synthetic