Acid-promoted oxidative methylenation of 1,3-dicarbonyl compounds with DMSO: application to the three-component synthesis of Hantzsch-type pyridines
作者:LuLu Xue、Guolin Cheng、Ruifeng Zhu、Xiuling Cui
DOI:10.1039/c7ra07442e
日期:——
A highly convergent one-pot synthesis of Hantzsch-type pyridines has been developed based on a three-component annulation of 1,3-dicarbonyl compounds, DMSO, and ammonium salt. A transition-metal-free oxidative methylenation reaction/Hantzsch pyridine synthesis cascade reaction was involved in this process. This intermolecular annulation reaction proceeds under mild reaction conditions, wherein DMSO
Oxidative C(Sp3)–H activation and C–N cleavage of N-methyl amines under transition-metal-free condition for synthesis of methylene-bridged bis-1,3-diketones
作者:Xiaohu Wang、Yi Wang、Yu Yuan、Chun-Hui Xing
DOI:10.1016/j.tet.2014.01.033
日期:2014.3
A transition-metal-free oxidative methylenation reaction was developed. Methylene-bridged bis-1,3-dicarbonyl compounds were synthesized by oxidative C(Sp(3))-H activation and C-N cleavage of N-methyl amines. This novel reaction avoids the use of transition metal catalyst. Furthermore, the reaction are very mild and operational convenient. (C) 2014 Elsevier Ltd. All rights reserved.
Highly Selective Aldol Reaction of Dibenzoylmethanes with Formaldehyde Catalyzed by Cobalt Schiff Base Complex under Neutral Conditions