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Conversion of 4‐amino‐1 H ‐1,5‐benzodiazepine‐3‐carbonitrile to pyrazolo[3,4‐ d ]pyrimidines, pyrimido[1,6‐ a ]benzimidazole, and pyrazolo[3′,4′:4,5]pyrimido[1,6‐ a ]benzimidazoles
Author(s) -
Okamoto Yoshihisa,
Togo Isao,
Kurasawa Yoshihisa,
Takagi Kaname
Publication year - 1986
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570230644
Subject(s) - chemistry , benzimidazole , benzodiazepine , stereochemistry , medicinal chemistry , combinatorial chemistry , organic chemistry , biochemistry , receptor
The reactions of multifunctional compounds 2a, b, c, 3a, b and 4a, b which were readily obtained from 4‐amino‐1 H ‐1,5‐benzodiazepine‐3‐carbonitrile 1 with orthoesters are described, and derivatives of pyrazolo‐[3,4‐ d ]pyrimidines 5 , pyrimido[1,6‐ a ]benzimidazole 9 , and pyrazolo[3′,4′:4,5]pyrimido[1,6‐ a ]benzimidazole 10 are synthesized.