Enantioselective Palladium(II)-Catalyzed Formal [3,3]-Sigmatropic Rearrangement of 2-Allyloxypyridines and Related Heterocycles
作者:Alessandro Rodrigues、Ernest E. Lee、Robert A. Batey
DOI:10.1021/ol9025759
日期:2010.1.15
Enantioselectivepalladium(II)-catalyzed formal [3,3]-sigmatropic rearrangement of (E)- and (Z)-allyloxy substituted N-heterocycles generates N-allyl N-heterocyclic amides in good yields and high enantioselectivities (up to 96% ee). The chiral palladacycle COP-Cl (5 mol %) is used as a catalyst with silver(I) trifluoroacetate (10 mol %) at 35−45 °C. Examples of heterocycles synthesized include 2-pyridones
Iridium-catalyzed asymmetric cascade dearomative allylation/acyl transfer rearrangement: access to chiral N-substituted 2-pyridones
作者:Wei-Yi Wang、Zhi-Yuan Yi、Zuo-Fei Wang、Xiu-Qin Dong、Chun-Jiang Wang
DOI:10.1039/d4cc00944d
日期:——
Iridium-catalyzed dearomative allylation/acyl transfer rearrangement has been developed using easily available 2-pyridinyl benzoates and vinyl ethylene carbonate. This protocol enabled the expedient synthesis of a variety of chiral N-substituted 2-pyridones in good to high yields with excellent enantioselectivity. It has the advantages of high atom economy, wide substrate scope, gram-scale synthesis