Asymmetric Hydrogenation of α-Primary and Secondary Amino Ketones: Efficient Asymmetric Syntheses of (−)-Arbutamine and (−)-Denopamine
作者:Gao Shang、Duan Liu、Scott E. Allen、Qin Yang、Xumu Zhang
DOI:10.1002/chem.200700594
日期:2007.9.17
Two beta-receptor agonists (-)-denopamine and (-)-arbutamine were prepared in good yields and enantioselectivities by asymmetrichydrogenation of unprotected aminoketones for the first time by using Rh catalysts bearing electron-donating phosphine ligands. A series of alpha-primary and secondaryaminoketones were synthesized and hydrogenated to produce various 1,2-amino alcohols in good yields and
Pd(II)-catalyzed annulation of N-benzyl-N-aroylmethyl-2-alkynamides with arylboronic acids: an efficient synthesis of highly substituted α-alkylidene-β-hydroxy-γ-lactams
作者:Huan Wang、Xiuling Han、Xiyan Lu
DOI:10.1016/j.tet.2010.09.090
日期:2010.11
A simple palladium(II)-catalyzed intramolecular addition of vinylpalladium species to ketones initiated by the carbopalladation of alkynamides under mild conditions without a Pd(II)/Pd(0) redoxsystem was developed. This cascade reaction provides a new approach for the synthesis of highly substituted α-alkylidene-β-hydroxy-γ-lactams.