A Simple Enantioselective Route to Functionalized Indolizidines: Synthesis of (+)-Ipalbidine and (+)-Antofine
作者:Sunil V. Pansare、Rajinikanth Lingampally、Rajendar Dyapa
DOI:10.1002/ejoc.201100125
日期:2011.4
efficient route to functionalizedindolizidines from an enantiomerically enriched γ-nitro ketone is described. The nitro ketone is obtained by an organocatalytic, enantioselective ketone-nitro alkene Michael addition. Oxidative ring expansion of the nitro ketone and subsequent methanolysis provides a 8-nitro-4-oxooctanoate. This is stereoselectively transformed to the key, functionalizedindolizidine intermediate
Enantioselective approach to functionalized quinolizidines: synthesis of (+)-julandine and (+)-cryptopleurine
作者:Sunil V. Pansare、Rajendar Dyapa
DOI:10.1039/c2ob25689d
日期:——
An efficient synthesis of functionalized quinolizidines was developed from an enantiomerically enriched γ-nitroketone, which is easily prepared by an organocatalytic ketone–nitroalkene Michael addition. Oxidative ring expansion of the nitroketone followed by reductive ring-opening leads to a suitably functionalized nitrodiol which is an intermediate to the title compounds.