作者:Zhaobin Wang、Fu Kit Sheong、Herman H. Y. Sung、Ian D. Williams、Zhenyang Lin、Jianwei Sun
DOI:10.1021/jacs.5b03083
日期:2015.5.13
The first catalytic asymmetric desymmetrization of azetidines is disclosed. Despite the low propensity of azetidine ring opening and challenging stereocontrol, smooth intermolecular reactions were realized with excellent efficiency and enantioselectivity. These were enabled by the suitable combination of catalyst, nucleophile, protective group, and reaction conditions. The highly enantioenriched densely
公开了氮杂环丁烷的第一个催化不对称去对称化。尽管氮杂环丁烷开环倾向低且立体控制具有挑战性,但仍以优异的效率和对映选择性实现了顺利的分子间反应。这些是通过催化剂、亲核试剂、保护基团和反应条件的适当组合来实现的。高度对映体富集的密集功能化产物是其他有用手性分子的通用前体。包括 DFT 计算在内的机理研究表明,尽管两种反应物都可以被激活,但只有一个催化剂分子参与关键过渡态。此外,Curtin-Hammett 原理规定反应通过酰胺氮活化进行。