Gold/copper-catalyzed activation of the aci-form of nitromethane in the synthesis of methylene-bridged bis-1,3-dicarbonyl compounds
作者:Rengarajan Balamurugan、Seetharaman Manojveer
DOI:10.1039/c1cc14926a
日期:——
Activation of the aci-form of nitromethane using Lewis acids for the attack of carbon nucleophiles was studied. 1,3-Dicarbonyl compounds in the presence of catalytic amounts of AuCl3 or Cu(OTf)2 in nitromethane solvent could be converted into methylene-bridged bis-1,3-dicarbonyl compounds.
Metal-free synthesis of methylene-bridged bis-1,3-dicarbonyl compounds via oxidative C–C bond cleavage of tertiary aliphatic amines
作者:Li-Juan Xing、Xi-Mei Wang、Hong-Ying Li、Wen Zhou、Ning Kang、Peng Wang、Bin Wang
DOI:10.1039/c4ra04419c
日期:——
A metal-free Bu4NI mediated oxidative reaction utilizing tertiaryaliphaticamines and 1,3-dicarbonyl compounds for the synthesis of methylene-bridgedbis-1,3-dicarbonyl compounds has been developed. This reaction involved an unexpected C–C bond cleavage of tertiaryaliphaticamines. With this approach, the completely regioselective functionalization of β-carbon on tertiaryamines was realized.
A novel, green and efficient method is developed for the synthesis of methylene bridged bis(indolyl)methanes in good to excellent yields. The reaction employs methyl tert-butyl ether (MTBE) as the methylene source and selectfluor as an oxidizing agent. The scope and versatility of the methods have been successfully demonstrated with 48 examples. The metal-free transformation process is suitable for
efficient and simple synthetic approach has been developed for the synthesis of bis-1,3-dicarbonyl compounds via visible light-mediated oxidation of tertiary amines in the presence of CsPbBr3 perovskite. This heterogeneous photocatalyst exhibits highly catalytic activity and broad applicability to a variety of substrates. It can be recycled by simple centrifugal filtration and reused several times without