Concise syntheses of substituted indolizidine alkaloids via cyclization based on α-sulfinyl carbanions: preparation of (±)-indolizidines 167B and 209D, their epimers, and (±)-tashiromine
作者:Manat Pohmakotr、Saisuree Prateeptongkum、Soontorn Chooprayoon、Patoomratana Tuchinda、Vichai Reutrakul
DOI:10.1016/j.tet.2008.01.008
日期:2008.3
(±)-Indolizidines 167B and 209D, their epimers and (±)-tashiromine have been successfully synthesized, starting from simple γ- or α-lactams. The strategy involves the cyclization of α-sulfinyl carbanion onto the carbonyl group of the lactam ring as the key step, leading to the indolizidines containing the phenylsulfinyl group, which are used as precursors for the preparation of the title compounds
从简单的γ-或α-内酰胺开始,已经成功地合成了(±)-吲哚唑烷167B和209D,它们的差向异构体和(±)-tashiromine。该策略涉及将α-亚磺酰基碳负环到内酰胺环的羰基上的环化作为关键步骤,从而导致含有苯基亚磺酰基的吲哚并咪唑用作制备标题化合物的前体。