Redox-Neutral Photocatalytic Radical Cascade Cyclization for the Synthesis of CH2CN/CF2COOEt/CF3-Containing Benzo[4,5]imidazo[2,1-a]isoquinolin-6(5H)-One Derivatives
摘要:
A novel method for the synthesis of benzo[4,5]imidazo[2,1-a]isoquinolin derivatives via visible-light-induced radical cascade cyclization is described. By using N-methacryloyl-2-phenylbenzoimidazoles and diverse radical precursors, various benzo[4,5]imidazo[2,1-a]isoquinolin derivatives containing CH2CN/CF2COOEt/CF3 can be formed in good to excellent yields under mild reaction conditions. This method exhibits good functional group tolerance and a wide range of substrate scope.
A novel ternary GO@SiO
<sub>2</sub>
‐HPW nanocomposite as an efficient heterogeneous catalyst for the synthesis of benzazoles in aqueous media
作者:Setareh Habibzadeh、Ghasem Firouzzadeh Pasha、Mahmood Tajbakhsh、Nasim Amiri Andi、Ehsan Alaee
DOI:10.1002/jccs.201800323
日期:2019.8
electron microscopy (SEM), and powder X‐ray diffraction (XRD). The prepared nanocomposite could be dispersed homogeneously in water and further used as a heterogeneous, reusable, and efficient catalyst for the synthesis of benzimidazoles and benzothiazoles by the reaction of 1,2‐phenelynediamine or 2‐aminothiophenol with different aldehydes.
The Direct Synthesis of Imines, Benzimidazoles and Quinoxalines from Nitroarenes and Carbonyl Compounds by Selective Nitroarene Hydrogenation Employing a Reusable Iron Catalyst
作者:Christoph Bäumler、Rhett Kempe
DOI:10.1002/chem.201801525
日期:2018.6.26
robust and reusable iron catalyst, which permits the selective hydrogenation of nitroarenes in the presence of hydrogenation‐sensitive functional groups. Based on the selectivity pattern observed, the directiron‐catalyzed synthesis of imines and benzimidazoles from nitroarenes and aldehydes becomes feasible. In addition, we introduce the directsynthesis of quinoxalines from nitroarenes and diketones
A simple and efficient method is demonstrated for the synthesis of benzimidazoles via cyclocondensation of o-phenylenediamine with aldehydes in the presence of catalytic amount of tert-butyl nitrite. All the reactions were carried out at room temperature while the desired products were obtained in good to excellent yields.
N-Methylthiomethylation of benzimidazoles with DMSO and their chemoselective oxidation to sulfoxides with NaBiO3
作者:Chhanda Mukhopadhyay、Pradip Kumar Tapaswi、Swarbhanu Sarkar、Michael G. B. Drew
DOI:10.3998/ark.5550190.0012.929
日期:——
for the N-methylthiomethylation of benzimidazoles has been developed employing DMSO as a solvent and as a reagent. This methodology has been applied for the synthesis of diverse N-methylthiomethyl derivatives of benzimidazoles. The products can be chemoselectively oxidized to the corresponding sulfoxides with NaBiO3 in acetic acid. Both the N-methylthiomethyl derivatives of benzimidazoles and their
Synthesis and diverse general oxidative cyclization catalysis of high-valent Mo<sup>VI</sup>O<sub>2</sub>(HL) to ubiquitous heterocycles and their chiral analogues with high selectivity
作者:Nabyendu Pramanik、Satinath Sarkar、Dipanwita Roy、Sudipto Debnath、Sukla Ghosh、Saikat Khamarui、Dilip K. Maiti
DOI:10.1039/c5ra21825j
日期:——
The first synthesis and diverse oxidative cyclization catalysis properties of high-valent MoVI–triazole are demonstrated towards highly selective construction of benzimidazoles, benzothiazoles, isoxazolines, isoxazoles and their chiral analogues.