Total synthesis of (+)-polyoximic acid - cis-3-ethylidene-L-azetidine-2-carboxylic acid
作者:Stephen Hanessian、Jian-Min Fu、José-Luis Chiara、Romano Di Fabio
DOI:10.1016/s0040-4039(00)60516-6
日期:1993.6
The stereocontrolled total synthesis of (natural) cis- and (unnatural) trans-polyoximic acids is described starting with D-serine as a chiral template.
Total synthesis of polyoximic acid
作者:Stephen Hanessian、Jian-min Fu
DOI:10.1139/v01-171
日期:2001.11.1
structure and stereochemistry of polyoximic acid, a degradation product of polyoxins, was originally designated as trans-3-ethylidene-L-azetidine-2-carboxylic acid. However, total synthesis revealed that the correct structure was in fact cis-3-ethylidene-L-azetidine-2-carboxylic acid, which was confirmed by X-ray crystallography. The synthesis of the trans-isomer was also done and its identity was confirmed
聚肟酸是一种多氧化合物的降解产物,其结构和立体化学最初被命名为反式-3-亚乙基-L-氮杂环丁烷-2-羧酸。然而,全合成表明正确的结构实际上是顺-3-亚乙基-L-氮杂环丁烷-2-羧酸,这通过X射线晶体学证实。反式异构体的合成也已完成,其身份也通过 X 射线分析得到证实。构建四元环的关键步骤是铑催化的类卡宾插入到β-氨基酸衍生物的N 2 H 键中。通过进行 Horner-Emmons-Wadsworth 或 Wittig 反应以分别产生反式和顺式异构体来控制外双键的立体选择性。温雷布' s 酰胺用作潜在的甲基,用于分离反式和顺式混合物。通过广泛的 2D NMR 研究也证实母体多肟中多肟酸的双键立体化学是顺式的。 关键词:重氮插入,...