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
Synthesis and cytotoxic evaluation of novel paraconic acid analogs
作者:Camille Le Floch、Erwan Le Gall、Eric Léonel、Thierry Martens、Thierry Cresteil
DOI:10.1016/j.bmcl.2011.09.092
日期:2011.12
A novel class of 2,3-tri- and tetrasubstituted gamma-butyrolactones analogous to paraconic acids has been synthesized in one step using a straightforward three-component reaction among aryl bromides, dimethyl itaconate and carbonyl compounds. The in vitro cytotoxic activity of representative compounds has been evaluated against a panel of human cancer cell lines (KB, HCT116, MCF7, HL60). While most molecules exhibit a low to moderate background activity on both KB and HL60 cancer cell lines, one compound shows increased antiproliferative activities against both cell lines with IC50 values in the 10(-7)-10(-6) mol/L range. An extended evaluation indicated that this compound also inhibits PC3, SK-OV3, MCF7R and HL60R cell growth in the same fashion. (C) 2011 Elsevier Ltd. All rights reserved.
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.
Real-time monitoring of a cobalt-mediated one-pot transition metal-catalyzed multicomponent reaction
作者:Antônio E.M. Crotti、Daniel Previdi、Paulo M. Donate、J. Scott McIndoe
DOI:10.1016/j.ica.2020.119654
日期:2020.8
ionization massspectrometry (PSI-ESI-MS) and FTIR spectroscopy were used to investigate the mechanism of a like-Barbier cobalt-mediated one-pot transition metal-catalyzed multicomponentreaction (MCR). The use of charge-tagged aryl halides allowed for the detection of cobalt(II)-promoted hydrodehalogenation products. Although these products were also detected in the off-line ESI-MS monitoring, the ability