Stereoselective Synthesis of Highly Functionalized Nitrocyclopropanes via Organocatalyic Conjugate Addition to Nitroalkenes
作者:Séamus H. McCooey、Thomas McCabe、Stephen J. Connon
DOI:10.1021/jo0613838
日期:2006.9.1
A convenient and novel one-pot organocatalytic methodology for the stereoselectivesynthesis of highly functionalized nitrocyclopropanes is reported. The addition of dimethyl chloromalonate to a variety of nitroolefins catalyzed by tertiary amines leads to a Michaeladduct which cyclizes to form the cyclopropane in the presence of DBU under carefully controlled reaction conditions with outstanding
Highly Enantioselective Synthesis of Nitrocyclopropanes via Organocatalytic Conjugate Addition of Bromomalonate to α,β-Unsaturated Nitroalkenes
作者:Yi-ning Xuan、Shao-zhen Nie、Li-ting Dong、Jun-min Zhang、Ming Yan
DOI:10.1021/ol900227j
日期:2009.4.2
Highly enantioselectivesynthesis of nitrocyclopropanes was achieved via the organocatalytic conjugate addition of dimethyl bromomalonate to nitroalkenes and the consequent intramolecular cyclopropanation. 6′-Demethyl quinine was found to be the efficient catalyst. Excellent enantioselectivities, diastereoselectivities, and good yields were obtained for a variety of aryl or heteroaryl nitroethylenes
Stereoselective synthesis of functionalised cyclopropanes from nitroalkenes via an organocatalysed Michael-initiated ring-closure approach
作者:Alessio Russo、Alessandra Lattanzi
DOI:10.1016/j.tetasy.2010.04.005
日期:2010.5
Synthetically useful nitrocyclopropanes are easily obtained via Michael addition of dimethyl bromomalonate to nitrostyrenes promoted by commercially available (S)-alpha,alpha-di-beta-naphthlyl-2-pyrrolidinemethanol as the catalyst, followed by DABCO-mediated intramolecular nucleophilic substitution. The functionalised nitrocyclopropanes are obtained in good yield, excellent diastereoselectivity and up to 49% ee. (C) 2010 Elsevier Ltd. All rights reserved.