100375-14-2Relevant articles and documents
Ruthenium carbonyl-catalyzed deoxygenation by carbon monoxide of o-substituted nitrobenzenes. Synthesis of benzimidazoles
Crotti, Corrado,Cenini, Sergio,Ragaini, Fabio,Porta, Francesca,Tollari, Stefano
, p. 283 - 298 (1992)
Ru3(CO)12 is a very efficient catalyst for the deoxygenation of 2-nitro-N-(phenylmethylene) benzeneamine derivatives to give the corresponding 2-substituted benzimidazoles, at 220°C and 50 bar of carbon monoxide. Main byproducts are the corresponding amines. The same benzimidazoles are also obtained starting from o-nitroaniline and the corresponding aldehyde. When N-(2-nitrophenyl)methylene benzencamine derivatives are used as substrates, the reaction changes dramatically and only traces of the corresponding heterocyclic compounds are obtained, although complete conversion of the starting nitro compounds is achieved.
Thiophene-embedded conjugated microporous polymers for photocatalysis
An, Wan-Kai,Cao, Zhan-Qi,Ding, San-Yuan,Du, Ya-Nan,Jiang, Song,Li, Zhi-Jun,Liu, Xiaobiao,Pan, Zhenliang,Qin, Yuchen,Song, Meirong,Wei, Pi-Feng,Zheng, Shi-Jia
, p. 5171 - 5180 (2020)
Various photoactive building blocks can be incorporated into porous organic polymers (POPs). The intrinsic properties, such as various synthetic methods, outstanding inherent porosity, easy tunability, rigid conjugated skeletons and high stability, endow the polymeric organic networks with wonderful potential to act as heterogeneous photocatalytic platforms. However, exploitation of efficient synthetic strategies for metal-free and nontoxic heterogenous photocatalysts, and further insights into the photocatalytic process in organic transformations are still necessary. In this context, we report the concise synthesis of two polymeric frameworks (BTP-CMP and TBTP-CMP) incorporated into bithiophene and thiophthene units via a "bottom-up"strategy. BTP-CMP and TBTP-CMP were employed as heterogeneous photocatalysts in the synthesis of benzimidazoles, and exhibited excellent catalytic activity (up to 98% yield, at least 15 iterative runs). Therefore, the thiophene-embedded networks can serve as stable efficient and recyclable heterogeneous photocatalysts. Additionally, based on the catalytic results of control experiments and the energy band structures of the materials and intermediates, a possible photocatalytic reaction mechanism has been proposed.
Three-Way Chemoselectivity Switching through Coupled Equilibria
Puangsamlee, Thamon,Miljani?, Ognjen ?.
supporting information, p. 5900 - 5904 (2020/08/05)
Controlling the chemoselectivity of reactions operating on complex mixtures, including those found in biological and petrochemical feedstocks or in the primordial soup from which life emerged, is generally challenging. The selectivity of imine oxidation c
Synthesis of 2-aminoquinoxalines via one-pot cyanide-based sequential reaction under aerobic oxidation conditions
Cho, Yeon-Ho,Kim, Kyung-Hee,Cheon, Cheol-Hong
, p. 901 - 907 (2014/03/21)
A highly efficient synthesis of 2-aminoquinoxalines has been developed via the one-pot two-step cyanide-mediated sequential reactions of ortho-phenylenediamines with aldehydes under aerobic oxidation conditions. A variety of substrates, including aliphati
An efficient and environmental benign synthesis of 2-benzimidazoles and 2-benzothiazoles using CeCl3-NaI as catalyst
Zhu, Xun,Wei, Yunyang
, p. 119 - 121 (2013/04/23)
A one-pot condensation of an aldehyde with 1,2-phenylenediamine or 2-aminothiophenol in dimethyl carbonate at 100°C under O2 in the presence of catalytic amounts of CeCl3-NaI gave an imine intermediate, which cyclised and dehydrogenated to give 2-arylbenzimidazoles or 2-arylbenzothiazoles in good yields.
Water-mediated synthesis of 2-substituted benzimidazoles by boric acid and glycerol
Mukhopadhyay, Chhanda,Tapaswi, Pradip Kumar,Butcher, Ray J.
experimental part, p. 140 - 144 (2009/08/15)
A very simple, mild, and highly efficient green catalyst has been developed for the synthesis of 2-substituted benzimidazoles by treatment of substituted ortho-phenylenediamines and aldehydes in water at 80C in the presence of boric acid (5 mol-%) and glycerol (0.05 mL). This methodology has been standardized on 55 substrates, and nine new compounds have been synthesized.
