A new dinuclear chiral salen complexes for asymmetric ring opening and closing reactions: Synthesis of valuable chiral intermediates
作者:Santosh Singh Thakur、Shu-Wei Chen、Wenji Li、Chang-Kyo Shin、Seong-Jin Kim、Yoon-Mo Koo、Geon-Joong Kim
DOI:10.1016/j.jorganchem.2005.12.044
日期:2006.4
A new dinuclear chiral Co(salen) complexes bearing group 13 metals have been synthesized and characterized. The easily prepared complexes exhibited very high catalytic reactivity and enantioselectivity for the asymmetric ring opening of epoxides with H2O, chloride ions and carboxylic acids and consequently provide enantiomerically enriched terminal epoxides (>99% ee). It also catalyzes the asymmetric
合成和表征了一种新型的带有第13族金属的双核手性Co(salen)配合物。易于制备的配合物对于环氧化物与H 2 O,氯离子和羧酸的不对称开环表现出非常高的催化反应活性和对映选择性,因此提供了对映体富集的末端环氧化物(> 99%ee)。它也催化开环产物的不对称环化,一步就可以制备出光学纯的末端环氧化物。均相双核手性Co(salen)已共价固定在MCM-41上。异质化的潜在好处包括需要非常简单的技术来促进催化剂的分离和可回收性。所描述的系统非常有效。