## Abstract The convenient one pot synthesis of pyrazolo[3,4β__c__]isoquinolines **1** from 5βaminopyrazoles **2** and paraformaldehyde in formic or trifluoroacetic acids is described.
A convenient one pot synthesis of substituted 4-aminobenzopyrano[3,4-c]pyridinones
β Scribed by D. W. Rangnekar; S. V. Dhamnaskar
- Book ID
- 112129121
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1988
- Tongue
- English
- Weight
- 160 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0022-152X
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Condensation of cΒ’-phthaloylaminoacetophenones la.-c with N,N-dimethylformamide dimcthyl acetal afforded the novel enamines 3a-c. Cyclization of 3 with hydrazine, alkylhydrezine or phenylhydrazine salts (4a-d) gave 4-phthaloylamino-3-arylpyrazoles 7-9 in high yields. Deprotection of 7-9 was accompli