Synthesis and biological activity of 1,5-dihydropyridazino-[3,4-b]quinoxalines and a new class of quinolones
✍ Scribed by Yoshihisa Kurasawa; Ho Sik Kim
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1998
- Tongue
- English
- Weight
- 374 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0022-152X
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✦ Synopsis
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‐b]quinoxalines, 1,4‐dihydro‐4‐oxopyridazino[3,4‐b]quinoxaline‐3‐carboxylic acids, and related compounds showed biological activity.
📜 SIMILAR VOLUMES
Quinolone analogues I -VI with pyridazino [3,4-b]quinoxaline ring system were synthesized from the (1-alkylhydrazino)quinoxaline N-oxides 1 via oxidation of pyridazino [3,4-b] quinoxalines 2,3,5,7, quinoxalino[2,3-c]cinnolines 4, and1,2-diazepino[3,4-b]quinoxalines 6. The biological activities of qu
## 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
## 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‐