The formal total synthesis of the marine metabolite (+)-calyculin A is reported. The key steps involve (i) the use of Brown allylboration chemistry to control the relative and absolute stereochemistry of homoallylic alcohol arrays, thus setting eight of the desired stereocenters; (ii) Stille coupling methodology in the construction of the cyano tetraene unit of the natural product; and (iii) a modified CornforthMeyers approach to the synthesis of the oxazole fragment.Key words: calyculin, marine natural product, phosphatase inhibitor, total synthesis, palladium catalyzed coupling reactions, allylboration reactions, aldol reactions, spiroketal, CornforthMeyers oxazole reaction.
报道了海洋代谢产物(+)-卡伊库林A的正式全合成。关键步骤包括(i)使用布朗烯丙基
硼化
化学来控制同型烯醇阵列的相对和绝对立体
化学,从而设置所需的八个立体中心;(ii)在构建
天然产物的
氰基四烯单元中使用斯蒂尔偶联方法;以及(iii)一种改良的Cornforth-Meyers方法来合成
噁唑片段。关键词:卡伊库林,海洋
天然产物,
磷酸酶
抑制剂,全合成,
钯催化偶联反应,烯丙基
硼化反应,醛缩反应,螺
环醚,Cornforth-Meyers
噁唑反应。