在叔丁醇钾和有机分子作为催化剂存在的情况下,已经开发出一种涉及邻卤代N芳基苄胺的“无过渡金属”分子内联芳基偶合的方法。该反应似乎通过KO t Bu促进的分子内均溶芳族取代(HAS)进行。有趣的是,这种联芳基偶合在叔丁醇钾作为唯一促进剂的情况下也起作用。在进一步扩展我们的方法时,我们发现N-酰基2-溴-N-芳基苄胺经历了一锅N-脱保护/联芳基偶联,然后进行氧化,因此提供了通往菲啶和苯并[ c ]菲啶骨架的快速途径。该策略已被应用于简明的金莲花科生物碱的合成。oxoassoanine(1B),anhydrolycorinone(1D),5,6- dihydrobicolorine(2D),trispheridine(2B),和苯并[ C ^ ]菲啶生物碱dihydronitidine(图3b),dihydrochelerythidine(3D),dihydroavicine(3F),norni
Antileukemic activity of ungeremine and related compounds. Preparation of analogs of ungeremine by a practical photochemical reaction
作者:Robert K. Y. Zee-Cheng、Shou-Jen Yan、C. C. Cheng
DOI:10.1021/jm00200a011
日期:1978.2
A number of alkoxypyrrolophenanthridinium salts and their analogues related to the antileukemic alkaloid ungeremine were prepared by a practical photochemical cyclization. The importance of the quaternary nitrogen atom and of alkoxy groups, the planarity of a molecule, and steric considerations relative to antileukemic activity are discussed.