Convergent Highly Stereoselective Preparation of the C12−C24 Fragment of Macrolactin A
作者:Carlo Bonini、Lucia Chiummiento、Maddalena Pullez、Guy Solladié、Françoise Colobert
DOI:10.1021/jo049556l
日期:2004.7.1
introduced by the application of chiral sulfoxides methodology on fragment C19−C24. The preparation of the versatile 1,3-anti diol synthon C12−C16 was achieved via opening of chiral epoxide and subsequent oxidation to a hydroxy ketone. Finally, reductive elimination of the appropriate allylic dibenzoate with Na/Hg introduced directly the C16−C19 (E,E)-diene unit, in a highly efficient stereoselective fashion
描述了大内酰胺A的C12-C24片段(下部)的会聚合成。调整后的策略允许通过有机金属加成通过组装三个关键中间体来构建较低部分。通过在片段C19-C24上应用手性亚砜方法引入了一个羟基立体生成中心。多功能的1,3-抗二醇合成子C12-C16的制备是通过打开手性环氧化物然后氧化为羟基酮来实现的。最后,用Na / Hg还原消除适当的烯丙基二苯甲酸酯,以高效的立体选择性方式直接引入C16-C19(E,E)-二烯单元。