developed an efficient method for the synthesis of benzimidazoles via cascade reactions of o-haloacetoanilide derivatives with amidine hydrochlorides. The protocol uses 10 mol % CuBr as the catalyst, Cs2CO3 as the base, and DMSO as the solvent, and no ligand is required. The procedure proceeds via the sequential coupling of o-haloacetoanilide derivatives with amidines, hydrolysis of the intermediates (amides)
Assembly of Substituted 1<i>H</i>-Benzimidazoles and 1,3-Dihydrobenzimidazol-2-ones via CuI/<scp>l</scp>-Proline Catalyzed Coupling of Aqueous Ammonia with 2-Iodoacetanilides and 2-Iodophenylcarbamates
作者:Xiaoqiong Diao、Yuji Wang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo9017183
日期:2009.10.16
CuI/l-proline catalyzed coupling of aqueous ammonia with 2-iodoacetanilides and 2-iodophenylcarbamates affords the arylamination products at roomtemperature, which undergo in situ additive cyclization under acidic conditions or heating to give substituted 1H-benzimidazoles and 1,3-dihydrobenzimidazol-2-ones, respectively. A wide range of functional groups including ketone, nitro, iodo, bromo, and
CuI / l-脯氨酸催化氨水与2-碘乙酰苯胺和2-碘苯基氨基甲酸酯的偶联在室温下提供芳基胺化产物,将其在酸性条件下进行原位加成环化或加热以生成取代的1 H-苯并咪唑和1,3-二氢苯并咪唑-2-酮。在这些反应条件下,可以耐受包括酮,硝基,碘,溴和酯在内的各种官能团,从而为这些杂环提供了极大的多样性。
Characterization of new PPARγ agonists: Benzimidazole derivatives—importance of positions 5 and 6, and computational studies on the binding mode
In this and previous studies we investigated the importance of partial structures of Telmisartan on PPAR gamma activation. The biphenyl-4-ylmethyl moiety at N1 and residues at C2 of the central benzimidazole were identified to be essential for receptor activation and potency of receptor binding. Now we focused our attention on positions 5 and 6 of the central benzimidazole and introduced bromine (3b-5/6, 3c), phenylcarbonyl (3d-5/6), hydroxy(phenyl) methyl (3g-5/6), hydroxymethyl (3h-5/6) and formyl (3i) groups. The selection of these moieties was inspired by the structure of Losartan and its metabolite EXP3179. In order to increase the hydrophobicity of the central part of the molecule, the benzimidazole was exchanged by a naphtho[2,3-d] imidazole (5). The compounds 3a-3i and 5 were tested in a differentiation assay using 3T3-L1 preadipocytes and a luciferase assay using COS-7 cells, transiently transfected with pGal4-hPPAR gamma DEF, pGal5-TK-pGL3 and pRL-CMV, as established models for the assessment of cellular PPAR gamma activation. An enhanced effect on PPAR gamma activation could be observed if lipophilic moieties are introduced in these positions. 4 '-[(2-Propyl-1H-naphtho[2,3-d] imidazol-1-yl) methyl] biphenyl-2-carboxylic acid (5) was identified as the most potent compound with an EC50 of 0.26 mu M and the profile of a full agonist.Together with compounds of the former structure-activity relationship study (position 2-substituted benzimidazole derivatives 4a-4j), the binding mode of Telmisartan and its derivatives have been analyzed in 3D pharmacophore-driven docking experiments. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis and Characterization of Telmisartan‐Derived Cell Death Modulators to Circumvent Imatinib Resistance in Chronic Myeloid Leukemia
作者:Anna M. Schoepf、Stefan Salcher、Verena Hohn、Florina Veider、Petra Obexer、Ronald Gust
DOI:10.1002/cmdc.202000092
日期:2020.6.17
New strategies to eradicate cancer stem cells in chronic myeloid leukemia (CML) include a combination of imatinib with peroxisomeproliferator‐activatedreceptorgamma (PPARγ) ligands. Recently, we identified the partial PPARγ agonist telmisartan as effective sensitizer of resistant K562 CML cells to imatinib treatment. Here, the importance of the heterocyclic core on the cell death‐modulating effects