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Reaction of 1,4-di-(3-aminofurazan-4-oyl)piperazine 4 with dibromoisocyanurate (DBI) affords azofurazan-annulated macrocyclic lactam 7; the X-ray structure of the macrocycle 7 is reported. The synthesis was started with 3-aminofurazan-4-carboxylic acid 1. A one-pot method for preparation of the amino acid was elaborated from commercially available cyanoacetic ester. Amides of the acid have been prepared via the esterification and subsequent animation.
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Шереметев et al. (2005) studied this question.
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