作者:Mahender Khatravath、Naveen Kumar Mallurwar、Saidulu Konda、Jagan Gaddam、Pallavi Rao、Javed Iqbal、Prabhat Arya
DOI:10.1016/j.tetlet.2019.07.006
日期:2019.9
A practical stereoselective synthesis of the central C1–C10 fragment of eribulin and its two diastereomeric analogues is developed. Our approach relied on the use of l-ascorbic acid as the starting material which allowed accessing a key intermediate with a syn diol moiety (C9 and C10 of eribulin) and a carboxylic ester group. A functionalized six membered lactone having several required hydroxyl groups
开发了实用的立体选择性合成eribulin的中央C1-C10片段及其两个非对映异构体。我们的方法依赖于使用1-抗坏血酸作为起始原料,该原料允许获得具有合成二醇部分(eribulin的C9和C10)和羧酸酯基团的关键中间体。然后获得具有几个所需羟基的官能化六元内酯。在许多步骤中,内酯被转化为我们关键的oxa- Michael反应的中间体。区域控制和立体控制的分子内氧杂-迈克尔反应完成了具有反式融合的四氢吡喃的C1-11片段的合成,该片段具有各种羟基的精确立体化学,如eribulin一样。