Total Synthesis of the Microtubule Stabilizing Antitumor Agent Laulimalide and Some Nonnatural Analogues: The Power of Sharpless' Asymmetric Epoxidation
作者:Anjum Ahmed、E. Kate Hoegenauer、Valentin S. Enev、Martin Hanbauer、Hanspeter Kaehlig、Elisabeth Öhler、Johann Mulzer
DOI:10.1021/jo026743f
日期:2003.4.1
With (R,R)-tartrate the 16,17-epoxide laulimalide (1) is formed selectively, whereas (S,S)-tartrate generates the 21,22-epoxide 142. This demonstrates the high reagent control involved in the SAE process, which in this case is used to achieve high stereo- and regioselectivity. Laulimalide and some derivatives thereof have been tested with respect to antitumor activity and compared to standard compounds
描述了三种合成脱氧月桂酰亚胺(3)的途径,这是海洋海绵代谢产物laulimalide(1)的直接前体。这些路线的主要区别在于其闭环步骤。因此,路线1使用Still-Gennari烯化,路线2使用山口内酯化,路线3使用分子内的烯丙基硅烷-醛加成以建立大环结构。将未保护的脱氧衍生物3进行Sharpless′不对称环氧化(SAE)。酒石酸(R,R)选择性地形成16,17-环氧十二烷基苯磺酸(1),而酒石酸(S,S)-酒石酸生成21,22-环氧142。这表明SAE过程涉及较高的试剂控制,在这种情况下,可用于实现较高的立体选择性和区域选择性。