Fig. 7.
Synthetic scheme I: Reagents and conditions: (a) AcOH/ EtOH, Reflux 2-3 h, -H2O (b) NH2NH2.H2O, Pd/C, EtOH, reflux 2h.
Synthetic scheme I: Reagents and conditions: (a) AcOH/ EtOH, Reflux 2-3 h, -H2O (b) NH2NH2.H2O, Pd/C, EtOH, reflux 2h.