作者:Rubing Wang、Shanshan Zhou、Hudagula Jiang、Xiaogang Zheng、Wen Zhou、Shaoshun Li
DOI:10.1002/ejoc.201101505
日期:2012.3
The concise and efficient total syntheses of alkannin (1) and shikonin (2), based on the resolution of a key acid intermediate, are achieved with excellent enantiomeric excesses and high overall yields (99 % ee, 15.6 % for 1 and 99.8 % ee, 11.9 % for 2). The key steps of the synthetic strategy involve the convenient synthesis and separation of a pair of amide diastereoisomers and the mild hydrolysis
基于对关键酸中间体的拆分,实现了链烷酸 (1) 和紫草素 (2) 简洁高效的全合成,具有优异的对映体过量和高总产率(99 % ee,15.6 % 1 和 99.8 % ee , 11.9 % 为 2)。该合成策略的关键步骤包括一对酰胺非对映异构体的方便合成和分离以及酰胺的温和水解以去除胺手性助剂,以及甲基保护基团的有效脱保护序列。