Synthesis of new binol based [1+1] macrocyclic chiral manganese(III) Schiff bases as catalysts for asymmetric epoxidation
作者:Paulsamy Suresh、Sankareswaran Srimurugan、Ravindra T. Dere、R. Venkat Ragavan、Vadiraj Suphala Gopinath
DOI:10.1016/j.tetasy.2013.04.017
日期:2013.6
A series of new chiral binol based [1+1] macrocyclic Schiff bases have been synthesized in high yields in short reaction times via cyclo-condensation of dialdehydes with long tethers and chiral diamines. Macrocyclic Mn(salen) complexes containing N2O2 salen units incorporated with spacers of increased tether lengths were synthesized and characterized. The newly synthesized catalyst system was successfully employed for the enantioselective epoxidation of unfunctionalized olefins with high yields and good enantioselectivity. (C) 2013 Elsevier Ltd. All rights reserved.