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'Pyrazoles' in keywords Facet   Publication Year 1997  [X]
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1Author    Z. Einab, A. H. Ozien, *. A., -W Areth, A. O. Sarhan, H. Assan, A. H. El-Sherief, A. Bdalla, M. M. Ahm OudRequires 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 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1401.pdf 
 Identifier    ZNB-1997-52b-1401 
 Volume    52