Chiral Primary Amine-Polyoxometalate Acid Hybrids as Asymmetric Recoverable Iminium-Based Catalysts
作者:Jiuyuan Li、Xin Li、Pengxin Zhou、Long Zhang、Sanzhong Luo、Jin-Pei Cheng
DOI:10.1002/ejoc.200900594
日期:2009.9
acid–base assembly of multidentate chiral primary amines and solid polyacids is presented. A suitable structurally distinctive C2-symmetric chiral primary amine (CPA) was identified in this study and the optimal CPA–POM hybrid obtained catalyzed the Diels–Alder cycloaddition of α-substituted acroleins in high yields and fair-to-high selectivity under aqueous conditions. The primary amine in the metal–organic-framework
提出了一种通过多齿手性伯胺和固体多元酸的酸碱组装固定亚胺有机催化剂的新策略。在本研究中确定了一种合适的结构独特的 C2 对称手性伯胺 (CPA),获得的最佳 CPA-POM 杂化物在水性条件下以高产率和公平到高的选择性催化 α-取代丙烯醛的 Diels-Alder 环加成反应. 类金属有机骨架 (MOF) 催化剂中的伯胺充当催化中心和多齿碱性中心,而磷钨酸则充当催化剂锚和活性和立体选择性调节剂的双重作用。此外,类 MOF 催化剂表现出高反应性和物理稳定性,因此可以回收和重复使用 6 次,而活性和选择性损失很小。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)