Table 1. Effect of Different Amounts of Catalysts, Temperature, and Solvent (5 mL) in the Synthesis of N-Amino-2-pyridones.

entry	catalysts (mg)	temperature (°C)	solvent	time (min)	yield (%)
1	10	reflux	H2O	40	90
2	10	reflux	EtOH	60	72
3	10	reflux	n-hexane	90	trace
4	10	reflux	CH3CN	45	76
5	10	110	toluene	65	55
6	10	100	solvent-free	60	43
7	7	80	H2O	50	81
8	5	reflux	H2O	60	80
9	15	reflux	H2O	40	90
10	10	75	H2O	55	78
11	10	50	H2O	65	66
12	10	r.t.	H2O	85	35
13		r.t.	H2O	120	trace