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。
2,6-Disubstituted and 2,2,6-Trisubstituted Piperidines from Serine: Asymmetric Synthesis and Further Elaboration
作者:Hukum P. Acharya、Derrick L. J. Clive
DOI:10.1021/jo101010c
日期:2010.8.6
4-Hydroxy-3,4-dihydro-2H-pyridine-1-carboxylic acid benzyl esters, which are readily prepared from serine and terminal acetylenes, undergo Claisenrearrangement to piperidine derivatives when heated with butyl vinyl ether in the presence of Hg(OAc)2 and Et3N. This route to optically pure piperidines having substituents α to nitrogen is general, and the rearrangement products are versatile intermediates for making