6-aryl-2,6-hexanediones was achieved with chiral secondary amine catalyzed intramolecular aldolization. The current kinetic resolution protocol enables the synthesis of bothenantiomers of cyclohexenones with moderate to good enantioselectivity.
Highly enantioselective Michael addition of cyclic ketones to chalcones catalyzed by pyrrolidine-based imides
作者:Hong-Yu Xie、Shu-Rong Ban、Ju-Na Liu、Qing-Shan Li
DOI:10.1016/j.tetlet.2012.05.106
日期:2012.7
An efficient procedure for asymmetric Michaeladdition reaction of cyclic ketones with low activated chalcones catalyzed by pyrrolidine-based phthalimide and 1,8-Naphthalimide catalysts was developed. The corresponding products were obtained in high yields with high diastereoselectivities (up to 99:1 dr) and high enantioselectivities (up to 96% ee) under mild conditions.
A chiral benzoylthiourea–pyrrolidine catalyst for the highly enantioselective Michael addition of ketones to chalcones
作者:Shu-rong Ban、Xi-xia Zhu、Zhi-ping Zhang、Qing-shan Li
DOI:10.1016/j.bmcl.2014.04.005
日期:2014.6
A benzoylthiourea–pyrrolidine catalyst was developed for the asymmetric Michaeladdition of ketones to chalcones. The corresponding products were obtained in high yields with high level of diastereoselectivities (up to 99:1 dr) and high level of enantioselectivities (up to 94% ee) under mild conditions.
A polystyrene-supported 9-amino(9-deoxy)epi quinine derivative for continuous flow asymmetric Michael reactions
作者:Javier Izquierdo、Carles Ayats、Andrea H. Henseler、Miquel A. Pericàs
DOI:10.1039/c5ob00325c
日期:——
derivative catalyzes Michael reactions affording excellent levels of conversion and enantioselectivity using different nucleophiles and structurally diverse enones. The highly recyclable, immobilized catalyst has been used to implement a single-pass, continuous flow process (residence time: 40 min) that can be operated for 21 hours without significant decrease in conversion and with improved enantioselectivity