Highly selective multifunctional nanohybrid catalysts for the one-pot synthesis of α,β-epoxy-chalcones
作者:Dana-Georgiana Crivoi、Anna M. Segarra、Francesc Medina
DOI:10.1016/j.jcat.2015.11.020
日期:2016.2
An efficient one-pot heterogeneous process for producing chiral alpha,beta-epoxy-chalcones from the corresponding aldehydes and ketones, has been described. The nanohybrid materials based on poly-L-leucine immobilised into rehydrated hydrotalcites did not require any pre-activation and were easily recovered and recycled for four consecutive runs without losing their catalytic efficiency in terms of conversion, total selectivity towards the corresponding epoxy-chalcones and excellent enantioselectivity. (C) 2015 Elsevier Inc. All rights reserved.
Synthesis of optically active 2,3-substituted-1,2,3,4-tetrahydro-4-quinolones using polyleucine
作者:Wei-ping Chen、Ann L. Egar、Michael B. Hursthouse、K.M. Abdul Malik、Judo E. Mathews、Stanley M. Roberts
DOI:10.1016/s0040-4039(98)01249-0
日期:1998.11
Polyleucine catalyzes the asymmetric epoxidation of enone (1) in a non-aqueous medium to provide epoxy-ketones (2) and (3) (81 and 84% yields respectively; >98% ee). The epoxy-ketones (2) and (3) are subsequently cyclized to give 1,2,3,4-tetrahydro-4-quinolones (4) and (5) respectively, (C) 1998 Elsevier Science Ltd. All rights reserved.