An Approach to the Synthesis of the Manzamine Alkaloids Via the Vinylogous Amide<u>PH</u>otocyclo<u>A</u>ddition/<u>R</u>etro-Mannich Fragmentation/<u>M</u>annich Closure Cascade (pharM)
作者:Jeffrey D. Winkler、John E. Stelmach、Miles G. Siegel、Nizar Haddad、Jeffrey Axten、William P. Dailey
DOI:10.1002/ijch.199700008
日期:——
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 alkaloidmanzamine 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