Titania-supported iridium catalysts for dehydrogenative synthesis of benzimidazoles

被引：23

作者：

Wada, Kenji ^{[1
]}

Yu, Han ^{[2
]}

Feng, Qi ^{[2
]}

机构：

[1] Kagawa Univ, Dept Med Chem, Miki, Kagawa 7610793, Japan

[2] Kagawa Univ, Dept Adv Mat Sci, Takamatsu, Kagawa 7610396, Japan

来源：

CHINESE CHEMICAL LETTERS | 2020年 / 31卷 / 03期

基金：

日本学术振兴会;

关键词：

Benzimidazole; Iridium; Titania; Heterogeneous catalysts; Dehydrogenation; ONE-POT SYNTHESIS; 2-SUBSTITUTED BENZIMIDAZOLES; RUTHENIUM CATALYSTS; COUPLING REACTIONS; AROMATIC DIAMINES; ALCOHOLS; NANOPARTICLES; QUINOXALINES; NITROARENES; DERIVATIVES;

D O I：

10.1016/j.cclet.2019.05.054

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this review, development of supported catalysts for the dehydrogenative synthesis of benzimidazoles from primary alcohols and 1,2-phenylenediamine derivatives is briefly summarized. Among them, titania-supported iridium catalysts showed excellent activities under mild reaction conditions. Remarkably, the low-temperature activity of iridium catalyst was significantly affected by titania supports, and the reaction of 1,2-phenylenediamine and benzyl alcohol in the presence of rutile-supported catalysts proceeded smoothly at 100 degrees C to give 2-phenylbenzimidazole in high yields of up to 88%. On the other hand, catalysts supported on anatase generally showed poor activity at 100 degrees C. A significant relationship between CO uptake and the activity of titania-supported catalysts has been reported, indicating that well-reduced iridium species on rutile would be responsible for the predominant catalytic activity. The present results suggest the importance of the selection of suitable titania supports for the iridium catalysts. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

引用

页码：605 / 608

页数：4

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