Transition-metal-free stereoselective synthesis of C(1)–C(6) fragment of epothilones and their structural analogues
作者:Denis G. Shklyaruck、Artsiom N. Fedarkevich、Yurii Yu. Kozyrkov
DOI:10.1016/j.tet.2016.10.038
日期:2016.12
Two efficient and scalable asymmetric syntheses of C(1)–C(6) fragment of epothilones and their structural analogues from commercially available 1,2:5,6-di-O-isopropylidene-d-mannitol have been performed in seven and 12 steps with 35% and 36% overall yields, respectively. Both the approaches include of one-pot, sequential transformations. The key steps are l-histidine-catalyzed aldol reaction, Barton–McCombie
从商购的1,2- C(1)-C(6)埃坡霉素的片段和它们的结构类似物中的两个有效和可伸缩不对称合成:5,6-二- ö异亚丙基d -mannitol在七个和12已经进行了分别获得35%和36%的总收益。两种方法都包括一锅法,顺序变换。关键步骤是l-组氨酸催化的羟醛反应,Barton-McCombie脱氧,锌介导的Vasella片段化和氧化腈合成。