Scheme 2From: Synthesis and antifungal activities of novel nicotinamide derivatives containing 1,3,4-oxadiazoleSynthetic route to intermediates 3a-9c. Reagents and conditions: (i). Cl2SO, reflux, 2 h; (ii). Et3N, CH3Cl, reflux, <70%; (iii). (AcO)2O, reflux, 30 min.Back to article page