From Berbines to Protopines: Regiocontrolled Hofmann Elimination/Hydroboration/Oxidation ofN-Substituted Berbinium Salts
作者:María Valpuesta、Amelia Díaz、Rafael Suau、Gregorio Torres
DOI:10.1002/ejoc.200500573
日期:2006.2
An improved synthetic approach to protopines based on the sequential Hofmann elimination, hydroboration and oxidation of N-(arylmethyl)berbinium salts has been designed. By using berberine chloride as the starting material, this sequence of reactions has provided two new nonnatural proto
基于 N-(芳甲基)铼盐的顺序 Hofmann 消除、硼氢化和氧化反应,设计了一种改进的 protopines 合成方法。通过使用氯化小檗碱作为起始原料,这一系列反应提供了两种新的非天然原