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1,4-Benzothiazine-2-carboxylic acid 1-oxides as analogues of antibacterial quinolones

✍ Scribed by Violetta Cecchetti; Arnaldo Fravolini; Fausto Schiaffella; Oriana Tabarrini; Weicheng Zhou; Pier Giuseppe Pagella

Book ID: 112130290
Publisher: Journal of Heterocyclic Chemistry
Year: 1992
Tongue: English
Weight: 576 KB
Volume: 29
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570290215

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## Abstract The reaction of the alkylhydrazinoquinoxaline __N__‐oxides **2a‐d** with dimethyl acetylenedicarboxylate gave the dimethyl 1‐alkyl‐1,5‐dihydropyridazino[3,4‐__b__]qumoxaline‐3,4‐dicarboxylates **3a‐d**, whose reaction with nitrous acid effected the C~4~‐oxidation to afford the dimethyl