期刊
CATALYSIS LETTERS
卷 122, 期 3-4, 页码 338-343出版社
SPRINGER
DOI: 10.1007/s10562-007-9385-1
关键词
condensation; cyclization; o-phenylenediamines; microwave; montmorillonite K-10
The synthesis of several types of condensed benzo [N,N]-heterocycles such as benzimidazoles, benzodiazepines, quinoxalinones by a microwave-assisted solvent-free solid acid catalyzed method is described. The commercially available, inexpensive K-10 montmorillonite is an excellent catalyst for the synthesis of the target compounds. Our approach is based on the reactions of a wide variety of o-phenylenediamines, with ketones, aldehydes and bifunctional reagents, respectively. The cyclization reactions were initiated by microwave irradiation. The products, in most cases, were obtained in very high yields (up to 98%) and excellent selectivities in very short reaction times. The effective combination of solid acid catalysis, solvent-free conditions and microwave irradiation provides an attractive and highly ecofriendly approach for the synthesis of these important heterocycles.
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