Cinchona-modified Ru catalysts for enantioselective heterogeneous hydrogenation of aromatic ketones
作者:He-yan Jiang、Hua Chen、Rui-xiang Li
DOI:10.1016/j.catcom.2009.12.024
日期:2010.3
In this communication, we describe the highly enantioselectiveheterogeneoushydrogenation of aromatic ketones catalyzed by Ph3P stabilized Ru/γ-Al2O3, and modified by chiral diamines derived from cinchona alkaloids. A broad range of aromatic ketones over this catalyst can be hydrogenated to the corresponding alcohols with impressive enantioselectivity.
Stereoselective synthesis of highly substituted 1-isomorphans (1-azabicyclo[3.3.1]nonanes)
作者:Diego A. Cruz-Aguilar、Marcos Hernández-Rodríguez
DOI:10.1039/d3cc00621b
日期:——
We describe the first enantioselective synthesis of highly functionalized 1-azabicyclo[3.3.1]nonanes (1-IM). The 1-IM scaffold is present in natural products and drugs and is an isomer of the morphan moiety. The proposed methodology is based on an organocatalytic Michael addition of N-protected piperidine ketoesters to nitroalkenes and an intramolecular nitro-Mannich reaction as key transformations