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