Sodium Tetramethoxyborate: An Efficient Catalyst for Michael Additions of Stabilized Carbon Nucleophiles
作者:Araceli G. Campaña、Noelia Fuentes、Enrique Gómez-Bengoa、Cristina Mateo、J. Enrique Oltra、Antonio M. Echavarren、Juan M. Cuerva
DOI:10.1021/jo701354c
日期:2007.10.1
[GRAPHICS]Sodium tetramethoxyborate, easily prepared by reaction of inexpensive sodium borohydride with methanol, possesses a suitable combination of a Lewis base and a Lewis acid to catalyze Michael reactions at room temperature under practically neutral conditions. This reaction provides good to excellent yields of Michael addition products from a broad scope of Michael donor and Michael acceptor reagents.
Dang, Hai-Shan; Roberts, Brian P., Journal of the Chemical Society. Perkin transactions I, 1993, # 8, p. 891 - 898
作者:Dang, Hai-Shan、Roberts, Brian P.
DOI:——
日期:——
Lithium Chloride-Mediated Stereoselective Synthesis of Cyclopropanecarboxamides from γ,δ-Epoxy Malonates through a Domino Cyclopropanation/Lactonization/Aminolysis Process
作者:Marcelo V. Marques、Marcus M. Sá
DOI:10.1021/jo500712t
日期:2014.5.16
synthesis of novel multifunctionalized cyclopropanes from γ,δ-epoxy malonates and amines mediated by LiCl under mild conditions was carried out. This domino reaction involves the initial cyclopropanationvia intramolecular ring-opening of γ,δ-epoxy malonates through the cooperative catalysis of LiCl (acting as a Lewis acid) and a Brønsted base (a primary or, in selected cases, a secondary amine). The sequential