Dias L R, Alvim M J, Freitas A C, Barreiro E J, Miranda A L
Programa de Pós-Graduação em Química Orgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, Brazil.
Pharm Acta Helv. 1994 Dec;69(3):163-9. doi: 10.1016/0031-6865(94)90019-1.
A series of 5-acyl-arylhydrazone 1-H pyrazolo [3,4-b] pyridine derivatives (1), planned by applying classical ring isosterism, were synthesized in order to evaluate the structure-activity relationship (SAR), especially the participation of the structural acyl-arylhydrazone subunit in the analgesia. The synthetic route used produced the derivatives 1 in approximately 40% overall yield, using 9 as key intermediate. The results obtained from this study showed that in general the compounds of this series present a powerful analgesic activity in the test of abdominal contortions induced by acetic acid i.p. in albino mice, indicating the participation of the acyl-arylhydrazone moiety, as well the relevance of the substituent of the aryl ring, in the activity.
