α-aminoazoles in synthesis of heterocycles: III. 4- trifluoromethylpyrazolo[3,4-b]pyridines: Synthesis and structure
Cyclocondensation of N-substituted 5-aminopyrazoles with fluorinated 1,3-diketones yielded 4-trifluoromethyl-substituted pyrazolo[3,4-b]pyridines as the only reaction products. The regiostructure of compounds obtained was proved by 1H and 13C NMR homo- and heteronuclear correlation spectroscopy. Characteristic chemical shifts in the 13C NMR spectra of regioisomeric pyrazolo[3,4-b]pyridines were established.
Emelina,Petrov,Selivanov,Filyukov
p. 251 - 256
(2008/12/20)
SYNTHESIS OF AROMATIC PYRAZOLOPYRIDINE DERIVATIVES
Cyclocondensation of chalcones with 5-amino-3-methyl-1-phenylpyrazole leads to the formation of 2,4-diaryl-5-methyl-7-phenyl-3,4-dihydropyrazolo-pyridines, which undergo aromatization upon treatment with N-bromosuccinimide.
Orlov, V. D.,Kiroga, Kh.,Kolos, N. N.
p. 997 - 1001
(2007/10/02)
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