Synthesis of novel simplified sarcodictyin/eleutherobin analogs with potent microtubule-stabilizing activity, using ring closing metathesis as the key-step
作者:Raphael Beumer、Pau Bayón、Piergiuliano Bugada、Sylvie Ducki、Nicola Mongelli、Federico Riccardi Sirtori、Joachim Telser、Cesare Gennari
DOI:10.1016/j.tet.2003.08.057
日期:2003.10
The synthesis of a number of novel simplified eleutheside analogs with potent tubulin-assembling and microtubule-stabilizing properties is described, using ring closing metathesis as the key-step for obtaining the 6–10 fused bicyclic ring system. The RCM precursors were synthesized starting from aldehyde 3 [prepared in 6 steps on a multigram scale from R-(−)-carvone in 30% overall yield] via multiple
描述了许多具有有效的微管蛋白组装和微管稳定特性的新型简化的亮叶黄素类似物的合成,使用闭环易位作为获得6-10稠合双环系统的关键步骤。RCM前体是通过多个立体选择性布朗烯丙基化反应从醛3(从R -(-)-香芹酮以6克多步制法,以30%的总收率从醛3合成)合成的。第二代RCM催化剂13以良好的收率得到了作为单Z立体异构体的所需的闭环的10元碳环。RCM立体化学过程(100%Z)可能反映了热力学控制。讨论了均烯丙基和烯丙基取代基的保护基对于RCM反应效率的关键作用。天然产物的这些简化的类似物(尤其缺少C-4 / C-7醚桥)保留了有效的微管稳定活性。但是,细胞毒性测试与有效的微管蛋白组装和微管稳定特性并不平行:对三种常见的肿瘤细胞系(人卵巢癌和人结肠癌细胞系,IC 50在表2中给出的μM范围内)观察到有限的细胞毒性。),比紫杉醇(IC 50在nM范围内)小三个数量级。