吡咯烷三酸天然产物异牙酸 G 和 H 的统一方法已被开发。完成了两种天然产物的全合成,并通过将 5'-(R) 和 5'-(S) 异构体与真实材料样品进行比较来确定异糖酸 G 的正确立体结构。镍催化的环化构建吡咯烷环,同时建立环外四取代烯烃的 E 或 Z 立体化学。通过改变取代基引入时间以控制烯烃立体化学的可预测策略,使天然产物的 E-和 Z-烯烃的立体选择性组装成为可能。
First Total Synthesis and Stereochemical Definition of Isodomoic Acid G
作者:Yike Ni、Kande K. D. Amarasinghe、Bashar Ksebati、John Montgomery
DOI:10.1021/ol0355783
日期:2003.10.1
text] The first total synthesis and stereochemical definition of isodomoic acid G has been achieved. The key nickel-catalyzed coupling of an alkynyl enone with an alkenylzirconium allows formation of the pyrrolidine ring and most of the stereochemical features in a single step. This report provides the first total synthesis application of this new reaction and illustrates its utility in the stereoselective
Antipicornaviral compounds and compositions, their uses, and materials for their synthesis
申请人:——
公开号:US20030225042A1
公开(公告)日:2003-12-04
Compounds of the formula:
1
where the formula variables are as defined in the disclosure, advantageously inhibit or block the biological activity of the picornaviral 3C protease. These compounds, as well as pharmaceutical compositions containing these compounds, are useful for treating patients or hosts infected with one or more picornaviruses, such as RVP. Intermediates and synthetic methods for preparing such compounds are also described.