A new synthesis of 1,5-dihydropyridazino[3,4-b]quinoxalines and 2-(pyrazol-4-yl)quinoxalines
✍ Scribed by Yoshihisa Kurasawa; Akiko Takano; Kyoko Kato; Atsushi Takada; Ho Sik Kim; Yoshihisa Okamoto
- Book ID
- 112131536
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1996
- Tongue
- English
- Weight
- 344 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0022-152X
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📜 SIMILAR VOLUMES
## Abstract A new class of quinolones, 1,4‐dihydro‐4‐oxopyridazino[3,4‐__b__]quinoxaline‐3‐carboxylic acids and related compounds, were synthesized __via__ oxidation of 1,5‐dihydropyridazino[3,4‐__b__]quinoxalines obtained from 2‐hydrazinoquinoxaline 4‐oxides. Some of the 1,5‐dihydropyridazino[3,4‐
## Abstract The reaction of 6‐chloro‐2‐hydrazinoquinoxaline 4‐oxide **1b** with acetylacetone or benzoylacetone gave 6‐chloro‐2‐(3,5‐dimethylpyrazol‐i‐yl)quinoxaline 4‐oxide **5a** or 6‐chloro‐2‐(3‐methyl‐5‐phenylpyrazol‐1‐yl)quinoxaline 4‐oxide **5b**, respXectively. Compound **5a** or **5b** was
## Abstract The reaction of the 2‐(1‐alkylhydrazino)‐6‐chloroquinoxaline 4‐oxides **1a,b** with diethyl acetone‐dicarboxylate or 1,3‐cyclohexanedione gave ethyl 1‐alkyl‐7‐chloro‐3‐ethoxycarbonylmethylene‐1,5‐dihydropyridazino[3,4‐__b__]quinoxaline‐3‐carboxylates **5a,b** or 6‐alkyl‐10‐chloro‐1‐oxo‐