作者:Unmesh Shah、Samuel Chackalamannil、Ashit K. Ganguly、Mariappan Chelliah、Sergei Kolotuchin、Alexei Buevich、Andrew McPhail
DOI:10.1021/ja065198n
日期:2006.10.1
synthesis of its congener (-)-GB 13 are described. Decarboxylative aza-Michael reaction of the hexacyclic lactone precursor under acidic conditions, followed by basic workup, yielded (-)-GB 13 in 80% yield. Cyclization of (-)-GB 13 to oxohimgaline under acidic conditions, followed by internally coordinated sodium triacetoxyborohydride reduction, gave (-)-himgaline as the exclusive product.
描述了 (-)-himgaline 的首次全合成及其同源物 (-)-GB 13 的高度对映选择性合成。在酸性条件下六环内酯前体的脱羧氮杂-迈克尔反应,然后进行碱性处理,以 80% 的产率产生 (-)-GB 13。在酸性条件下将 (-)-GB 13 环化为 oxohimgaline,然后进行内部配位的三乙酰氧基硼氢化钠还原,得到 (-)-himgaline 作为唯一产物。