vinylogous amide [2+2] photocycloaddition/retro-Mannich fragmentation/Mannich closure cascade (pharM) to the synthesis of the pentacyclic ring system of the anti-leukemic marine alkaloid manzamine A is presented. Two approaches to the synthesis of the requisite pentacycle are described: (a) the transannular photocycloaddition of an 18-membered vinylogous amide; and (b) photocycloaddition of an acyclic
插烯酰胺的应用[2 + 2]光环/复古曼尼希分段/中号annich闭合级联(PHARM)与抗白血病海洋
生物碱manzamine A的五环的环系统的合成被呈现。描述了两种合成必要的五环的方法:(a)18元
乙烯基酰胺的跨环光环加成;(b)无环
乙烯基酰胺酰胺的光环加成,然后对衍生的pharM封闭产物进行大内酰胺化,以生成五环体系。