Development of a Flexible Approach to <i>Nuphar</i> Alkaloids via Two Enantiospecific Piperidine-Forming Reactions
作者:Katharine M. Goodenough、Wesley J. Moran、Piotr Raubo、Joseph P. A. Harrity
DOI:10.1021/jo048455k
日期:2005.1.1
In this paper we describe the stereoselective synthesis of functionalized lactam 7 via two enantiospecific piperidine-forming techniques and its employment in a general synthetic approach to Nuphar alkaloids. Specifically, the formation of piperidine 18 by formal [3 + 3] cycloaddition and stepwise annelation processes is described; the latter technique was found to be significantly more efficient than
在本文中,我们描述了通过两种对映体特异性哌啶形成技术的立体选择性合成功能化内酰胺7的方法,以及其在Nuphar生物碱的一般合成方法中的应用。具体而言,描述了通过正式的[3 + 3]环加成和逐步成核过程形成哌啶18的过程;发现后一种技术比Pd催化的TMM添加过程明显更有效。最后,在18到(-)-脱氧nupharidine((-)- 2),(-)-castoramine((-)- 3)和(-)的转化中,利用哌啶形成反应中安装的环外烯烃-nupharolutine((-)- 4经由中间体内酰胺7)被描绘出来。