Three-component synthesis of functionalized five-membered ring lactones under Barbier-like conditions
作者:Camille Le Floch、Carine Bughin、Erwan Le Gall、Eric Léonel、Thierry Martens
DOI:10.1016/j.tetlet.2009.07.038
日期:2009.9
Five-membered ring lactones have been synthesized using a straightforward three-component reaction among in situ-generated arylzinc reagents, dimethyl itaconate and aromatic aldehydes. This Barbier-like procedure. which is characterized by its simplicity, allows the concise synthesis of a range of highly functionalized 4,5-substituted gamma-butyrolactones. (C) 2009 Elsevier Ltd. All rights reserved.
A Cobalt-Catalyzed Multicomponent Approach to Novel 2,3-Di- and 2,2,3-Trisubstituted 3-Methoxycarbonyl-γ-butyrolactones
作者:Camille Le Floch、Erwan Le Gall、Eric Léonel、Jihen Koubaa、Thierry Martens、Pascal Retailleau
DOI:10.1002/ejoc.201000698
日期:2010.9
one-pot, three-component synthesis of the title butyrolactones starting from aryl bromides, dimethyl itaconate, and either aldehydes or ketones is described. The cobalt-catalyzed domino process formally involves the in situ metalation of an aromaticbromide, conjugate addition onto dimethyl itaconate, an aldolization reaction with a carbonyl compound and a final cyclization into a five-membered lactone