First total synthesis of the 7,6′-coupled antifungal naphthylisoquinoline alkaloid dioncophylline B 1
作者:Gerhard Bringmann、Christian Günther、Eva-Maria Peters、Karl Peters
DOI:10.1016/s0040-4020(00)01110-8
日期:2001.2
The first total synthesis of the antimalarial alkaloid dioncophylline B (2) from Triphyophyllum peltatum (Dioncophyllaceae), and thus the first preparation of a 7,6′-coupled naphthylisoquinoline, is described. Key steps within this synthesis are the ortho-functionalization of the MOM-protected naphthalene and isoquinoline moieties 14 and 7 by directed ortho-metalation, with subsequent stannylation
描述了从象牙白粉菌(Dioncophyllaceae)首次合成抗疟疾生物碱二茶碱B(2),从而首次制备了7,6'偶联的萘基异喹啉。该合成中的关键步骤是在邻位的MOM保护的萘和异喹啉部分的-functionalization 14和7通过定向邻位-metalation,与萘部分和溴化异喹啉部分的后续甲锡烷基化,和区域选择性的分子间Stille偶联反应这些构件。提出的合成方法为进一步制备此类生物碱的7偶联化合物开辟了道路。