Synthesis of 1 (11) H-2, 3, 4, 5-tetrahydro [1, 3] diazepino [1, 2-a] benzimidazole starting from benzimidazole-2-sulfonic acid. Intramolecular cyclization of 2-(δ- …

VA Anisimova, VV Kuz'Menko, TA Kuz'Menko…

Index: Anisimova; Kuz'Menko; Morkovnik Russian Chemical Bulletin, 2007 , vol. 56, # 11 p. 2315 - 2322

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Abstract

Abstract The intramolecular cyclization of 2-(δ-chlorobutylamino) benzimidazole (3c) follows the unusual pathway involving the predominant attack on the exocyclic amino group rather than on the much more nucleophilic endocyclic nitrogen atom. This reaction affords 2-

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