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
Benzannulation and
<i>N</i>
‐Annulation of β‐Ketoenamines for Synthesizing Aniline and Pyridine Derivatives Using DMSO as a Methine Source
作者:Pallaba Ganjan Dalai、Niranjan Panda
DOI:10.1002/adsc.202200886
日期:2022.11.8
N-annulation of β-ketoenamines by the in-situ generated methyl(methylene)sulfonium ion from the reaction of dimethylsulfoxide (DMSO) and 1,2-dibromoethane (DBE) was achieved. The β-ketoenamines underwent N-annulation to pyridine derivatives, while the N-alkylated enamines were benzannulated to afford substituted anilines. The utility of the intermediate methyl(methylene)sulfonium ion was further extended 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