| | 1 | Author
| Z. Einab, A. H. Ozien, *. A., -W Areth, A. O. Sarhan, H. Assan, A. H. El-Sherief, A. Bdalla, M. M. Ahm Oud | Requires cookie* | | | Title
| A Convenient One-Pot Synthesis of Pyrazolo[3,4-d]pyrimidines and s-Triazolo[3,4-b][l,3?5]thiadiazines  | | | | Abstract
| The reaction of 5-am ino-3-aryl-l-phenylpyrazoles (la-d) with formaldehyde and secondary amines in boiling ethanol gave the corresponding 4-alkylaminomethyl derivatives (2a-f) and bis-(4-pyrazolyl)methane (4a,b) as byproduct. Such reaction with primary aliphatic and aro matic amines at room temperature afforded 1,3,5-trisubstituted (5a-h) and 1,3.5,7-tetrasubsti-tuted tetrahydropyrazolo[3,4-d]pyrimidines (8a-k) respectively in good yield. Similarily, the Mannich reaction of 5-m ercapto-3-phenyl-l,2,4-triazole (9) with secondary amines, in boiling ethanol, and primary aromatic amines, at room temperature, gave 2 -substituted aminomethyl derivatives (lOa-c) and (14a-g) respectively,while with primary aliphatic amines, p-toluidine and p-anisidine,at room temperature,and with other primary aromatic amines, in boiling etha nol, afforded the cyclized products l,2,4-triazolo[3,4-b]thiadiazines (13a-e); (15f,g) and (15a-e), respectively. | | | |
Reference
| Z. Naturforsch. 52b, 1401—1412 (1997); received June 19 1997 | | | |
Published
| 1997 | | | |
Keywords
| Pyrazoles, Heterocycles, Triazoles, 'H NM R Spectra | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/52/ZNB-1997-52b-1401.pdf | | | | Identifier
| ZNB-1997-52b-1401 | | | | Volume
| 52 | |
|
