Total Synthesis of the Marine Alkaloid Halichlorine: Development and Use of a General Route to Chiral Piperidines
作者:Dazhan Liu、Hukum P. Acharya、Maolin Yu、Jian Wang、Vince S. C. Yeh、Shunzhen Kang、Chandramouli Chiruta、Santosh M. Jachak、Derrick L. J. Clive
DOI:10.1021/jo901481n
日期:2009.10.2
The total synthesis of the marine alkaloid halichlorine is described, based on an approach that involves constructing the fully substituted asymmetric center at an early stage. The five-membered ring is formed by 5-exo-trig radical cyclization and the unsaturated six-membered ring by a process that formally represents a sequential combination of conjugate addition and SN2′ displacement—a method that
基于涉及在早期构建完全取代的不对称中心的方法,描述了海洋生物碱盐酸盐的总合成。五元环是通过5- exo - trig自由基环化和不饱和六元环形成的,该过程正式代表共轭加成和S N 2'置换的顺序组合,这是制备双环化合物的一般方法氮在环的融合位置 基于制备光学纯的哌啶的通用方法的开发,还报道了(+)-卤代氯的正式合成。该方法的关键步骤(用于制造我们的中间体之一)是4-乙烯基氧基-3,4-二氢-2的克莱森重排H-吡啶-1-羧酸苄酯。这样的O-乙烯基化合物易于从相应的醇原位产生,其本身很容易由丝氨酸和末端乙炔组装而成。