[EN] PHOTOCATALYSTS, PREPARATION AND USE THEREOF [FR] PHOTOCATALYSEURS, LEUR PRÉPARATION ET LEUR UTILISATION
摘要:
There is provided a process for alkylating a substrate with a photocatalytic system. The process comprises providing a mixture containing an acid, and a substrate (an organic compound). Then, an organophotoredox catalyst of formula Ia is contact with the mixture. Finally, the organophotoredox catalyst is activated with a light irradiation to alkylate the substrate and form a carbon covalent bond.
Iron-Catalyzed Cyclization of Nitrones with Geminal-Substituted Vinyl Acetates: A Direct [4 + 2] Assembly Strategy Leading to 2,4-Disubstituted Quinolines
作者:Mingbing Zhong、Song Sun、Jiang Cheng、Ying Shao
DOI:10.1021/acs.joc.6b01910
日期:2016.11.18
An iron-catalyzed intermolecular [4 + 2] cyclization of arylnitrones with geminal-substituted vinyl acetates was developed for the synthesis of 2,4-disubstituted quinolines in moderate to good yields with good functional group compatibilities. Preliminary mechanistic studies suggest a plausible iron-catalyzed C–H activation process under external-oxidant-free conditions.
Synthesis of Polysubstituted Quinolines from α-2-Aminoaryl Alcohols Via Nickel-Catalyzed Dehydrogenative Coupling
作者:Sanju Das、Debabrata Maiti、Suman De Sarkar
DOI:10.1021/acs.joc.7b03198
日期:2018.2.16
This study reports a nickel-catalyzed sustainable synthesis of polysubstitutedquinolines from α-2-aminoaryl alcohols by a sequential dehydrogenation and condensation process that offers the advantages of a low catalyst loading and wide substrate scope. In contrast to earlier reported methods, this strategy allows the use of both primary as well as secondary α-2-aminoaryl alcohols in combination with
A Multicomponent Reaction of Acetals for the Preparation of Quinolines
作者:Xue-Lin Zhang、Qin-Pei Wu、Qing-Shan Zhang
DOI:10.3184/174751913x13814036942713
日期:2013.11
A straightforward, mild, one-pot method has been found for the preparation of quinolines via a multi-component reaction using acetals or cyclic acetals, aromatic amines and alkynes catalysed by Bi(OTf)3. It gives good yields under mild conditions. This approach has been successfully applied for the synthesis of a range of quinolines with a variety of functional groups.
PdCl2(dppf)-catalyzed in situ coupling of 2-hydroxypyridines with aryl boronic acids mediated by PyBroP and the one-pot chemo- and regioselective construction of two distinct aryl–aryl bonds
作者:Shui-Ming Li、Jie Huang、Guo-Jun Chen、Fu-She Han
DOI:10.1039/c1cc15753a
日期:——
of 2-arylated pyridine derivatives via the in situ coupling of 2-OH pyridines and boronic acidsmediated by PyBroP. In addition, the highly chemo- and regioselective construction of two different aryl-aryl bonds via a one-pot operation has also been demonstrated by the orthogonal use of this method with the Ni-catalyzed Suzuki-Miyaura coupling of phenols.
Selective Kumada biaryl cross-coupling reaction enabled by an iron(iii) alkoxide–N-heterocyclic carbene catalyst system
作者:Yi-Yuan Chua、Hung A. Duong
DOI:10.1039/c4cc02930e
日期:——
A catalyst system comprising Fe2(OtBu)6 and an N-heterocyclic carbene ligand enables efficient syntheses of (hetero)biaryls from the reactions of aryl Grignard reagents with a diverse spectrum of (hetero)aryl chlorides. Amongst the alkoxide and amide counterions investigated, tert-butoxide was the most effective in inhibiting the homocoupling of arylmagnesiums.