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Poly condensed nitrogen heterocycles. V. Two novel ring systems: Pyrazolo[5,1‐ c ]‐1,2,4‐thiadiazine and pyrazolo[3,4‐ c ]‐1,2‐thiazine
Author(s) -
Aiello Enrico,
Plescia Salvatore,
Dattolo Gaetano
Publication year - 1976
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.5570130341
Subject(s) - chemistry , thiazine , ring (chemistry) , electrophile , medicinal chemistry , chloride , pyrazole , nitrogen , nucleus , stereochemistry , organic chemistry , catalysis , biology , microbiology and biotechnology
The title compounds were obtained by reaction of aminopyrazoles IV and VII with ω‐acetophenonesulfonyl chloride (II, R = C 6 H 5 ). In agreement with the general pattern of the distribution of electron density in the pyrazole nucleus, this work confirms that the position 4 of ring is the favoured site of electrophilic attacks.