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
Diamine-mediated degradative dimerisation of Morita–Baylis–Hillman ketones
作者:Ajit Kumar Jha、Anju Kumari、Srinivasan Easwar
DOI:10.1039/c9cc10068g
日期:——
A degradative dimerisation of Morita-Baylis-Hillmanketones was observed in the presence of a primary diamine. The reaction proceeded swiftly to produce methylene-bridged 1,3-dicarbonyl compounds. A brief mechanisticinvestigation alluded to a retro-Mannich reaction as the key step of the transformation.
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