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 functionalized indolizidines 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, functionalized indolizidine intermediate
描述了从对映异构体富集的 γ-硝基酮官能化 indolizidines 的有效途径。硝基酮通过有机催化的对映选择性酮-硝基烯烃迈克尔加成获得。硝基酮的氧化扩环和随后的甲醇分解提供了 8-nitro-4-oxooctanoate。这被立体选择性地转化为关键的、功能化的吲哚里西啶中间体,该中间体很容易转化为 (+)-ipalbidine 和 (+)-antofine。