Multistep divergent synthesis of benzimidazole linked benzoxazole/benzothiazole via copper catalyzed domino annulation
作者:Jen-Yu Liao、Manikandan Selvaraju、Chih-Hau Chen、Chung-Ming Sun
DOI:10.1039/c3ob27177c
日期:——
An efficient, facile synthesis of structurally diverse benzimidazole integrated benzoxazole and benzothiazoles has been developed. In a multi-step synthetic sequence, 4-fluoro-3-nitrobenzoic acid was converted into benzimidazole bis-heterocycles, via the intermediacy of benzimidazole linked ortho-chloro amines. The amphiphilic reactivity of this intermediate was designed to achieve the title compounds
A Novel Mechanistic Study on Ultrasound-Assisted, One-Pot Synthesis of Functionalized Benzimidazo[2,1-<i>b</i>]quinazolin-1(1<i>H</i>)-ones
作者:Li-Hsun Chen、Tsai-Wen Chung、Bharat D. Narhe、Chung-Ming Sun
DOI:10.1021/acscombsci.5b00186
日期:2016.3.14
Ultrasound-assisted synthesis of benzimidazo[2,1-b]quinazolin-1(1H)-ones was achieved via piperidine-catalyzed three-component reaction of 2-aminobenzimidazoles, an aromatic aldehyde, and 1,3-dione in aqueous isopropanol. This mechanism was first suspected following our identification of unusual reaction intermediates in a one-pot reaction. An unprecedented coupling reaction, it involved a nucleophilic
通过哌啶催化的2-氨基苯并咪唑,芳香族醛和1,3-二酮在异丙醇水溶液中的三组分反应实现苯并咪唑并[2,1 - b ]喹唑啉-1(1 H)-的超声辅助合成。在我们确定了一锅反应中不寻常的反应中间体之后,首先怀疑了这种机制。前所未有的偶联反应,它涉及2-氨基苯并咪唑对原位生成的迈克尔加合物的亲核攻击,然后发生电环形成反应。与普遍接受的机理相反,2-氨基苯并咪唑与Knoevenagel加合物的直接反应不能释放目标化合物。
Microwave-Assisted Synthesis of Benzimidazole-Linked Indoline and Indole Hybrids from C-2 Linked (<i>o</i>
-Aminobenzyl)benzimidazoles
作者:Yun-Ta Lee、Feng-Yu Chiu、Indrajeet J. Barve、Chung-Ming Sun
DOI:10.1002/adsc.201701140
日期:2018.2.1
An efficient and novel synthesis of benzimidazole‐linked indoline hybrids via an unconventional Pictet‐Spengler‐type condensation of C‐2 linked (o‐aminobenzyl)benzimidazoles with aldehydes and ketones under microwave irradiation has been explored. The key condensation step consists of acid‐catalyzed imine generation followed by intramolecular C–C bond formation through unique reactivity of the benzimidazole
A series of 4,5,6,7-tetrahydro-1H-benzimidazole-5-carboxylic acid and 5,6,7,8-tetrahydroimidazo [1,2-a] pyridine-7-carboxylic acid derivatives designed as inhibitors of TAFIa has been prepared via a common hydrogenation-alkylation sequence starting from the appropriate benzimidazole and imidazopyridine system. We present a successful design strategy using a conformational restriction approach resulting in potent and selective inhibitors of TAFIa. The X-ray structure of compound 5 in complex with a H333Y/H335Q double mutant TAFI indicate that the conformational restriction is responsible for the observed potency increase. (c) 2014 Elsevier Ltd. All rights reserved.