期刊
TETRAHEDRON LETTERS
卷 55, 期 1, 页码 279-281出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.11.025
关键词
Benzimidazoles; o-Phenylenediamine; Polyazacycloalkanes; Dihydrobenzimidazoles; DIBAL-H
A facile procedure for the synthesis of benzannelated diazacycloalkanes 3 is elaborated on the basis of reductive cleavage of 1,2-polymethylenebenzimidazoles 2 with DIBAL-H. The reduction of the corresponding salts prepared by treatment of 1,2-polymethylenebenzimidazoles 2 with methyl iodide proceeded differently affording exclusively o-phenylenediamines 10. The limitations and scope of the method were established, and a tentative mechanism proposed. (C) 2013 Elsevier Ltd. All rights reserved.
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