simple and efficient protocol for the construction of substituted piperazines, piperidines, thiomorpholines, decahydroquinolines, perhydrocyclopenta[b]pyridine, and pyrrolidines bearing N-hydroxy substituents through intramolecularreductivecyclization of diketoximes using sodium cyanoborohydride is described.
Direct Asymmetric Michael Additions of Ketones to Nitroolefins and Chalcones Catalyzed by a Chiral C2-Symmetric Pyrrolidine-based Tetraamine
作者:Shijun Ma、Lulu Wu、Ming Liu、Yongmei Wang
DOI:10.1002/cjoc.201200214
日期:2012.8.14
C2‐Symmetric pyrrolidine‐based tetraamine, available from commercially starting materials, showed good catalytic activity for asymmetricMichaeladditions of ketones to nitroalkenes especially to chalcones. The reactions proceeded to give the corresponding products in good yields and in a highly selective manner.
C 2对称的基于吡咯烷的四胺(可从商业原料获得)显示出良好的催化活性,可将酮不对称地迈克尔加成至硝基烯烃,特别是对查耳酮。反应进行以高收率和高度选择性的方式得到相应的产物。
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.
Direct asymmetric Michael addition of ketones to chalcones catalyzed by a hydroxyphthalimide derived triazole–pyrrolidine
作者:Togapur Pavan Kumar、Mohammad Abdul Sattar、Vanka Uma Maheshwara Sarma
DOI:10.1016/j.tetasy.2013.11.002
日期:2013.12
An efficient protocol for the enantioselective Michael additions of ketones to chalcones catalyzed by a hydroxyphthalimide linked triazole-pyrrolidine derivative has been developed. The corresponding products, 1,5-dicarbonyl compounds, were obtained in good yields with high levels of stereoselectivities under mild reaction conditions employing benzoic acid as an additive. (C) 2013 Elsevier Ltd. All rights reserved.