An Acid/Base-Regulated Recyclable Strategy for Homogeneous Cinchona Alkaloid-Derived Primary Amine Organocatalysts in Aldol, Vinylogous Michael and Double-Michael Cascade Reactions
作者:Jingwei Wan、Zhiwei Zhao、Falu Wang、Xuebing Ma
DOI:10.1002/ejoc.201500566
日期:2015.9
reusability of the organocatalysts epi-CDNH2, DeMe-QNNH2 and H-CDNH2 over three cycles was investigated in detail. It was found that the organocatalysts were highly effective with respect to catalytic performance, including the yields and stereoselectivities. Furthermore, the recovered organocatalysts in the tenth cycle retained similar excellent enantioselectivities to fresh organocatalysts. However, the
通过调节水相的 pH 值来控制水/有机双相体系中的溶解度,影响伯氨基、叔氨基和吡啶基的质子化和去质子化,开发了一种实用的、可回收的均质金鸡纳生物碱衍生伯胺有机催化剂的策略. 通过模型羟醛、乙烯基迈克尔和双迈克尔级联反应,详细研究了有机催化剂epi-CDNH2、DeMe-QNNH2和H-CDNH2在三个循环中的可重复使用性。发现有机催化剂在催化性能方面非常有效,包括产率和立体选择性。此外,在第十个循环中回收的有机催化剂保留了与新鲜有机催化剂相似的优异对映选择性。然而,