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Updated: Aug 24, 2026

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
Published on: June 23, 2019
Combinatorial synthesis of biheterocyclic benzimidazoles by microwave irradiation
Wen-Bing Yeh1, Mei-Jung Lin, Chung-Ming Sun
1Laboratory of Combinatorial Drug Design, National Tong Hwa University, Shou-Feng, Hualien 974, Taiwan.
Abstract:
Liquid phasel synthesis of biheterocyclic benzimidazoles by controlled microwave irradiation was investigated. Polymer immobilized o-phenylenediamines was synthesized under microwave irradiation. The resulting PEG bound diamines was N-acylated with 4-fluoro-3-nitrobenzoic acid selectively in primary aromatic amino moiety. Nucleophilic aromatic substitution of amide was performed with various amines then cyclized to form the first benzimidazole scaffold in acidic condition. Successive reduction, cyclization with isothiocyanates yielded 5-(benzimidazol-2-yl)benzimidazoles. The desired products were released from the polymer support to afford the tri-substituted bis-benzimidazoles in good yields and purity.
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