An Efficient Protocol for the Synthesis of Quinoxaline Derivatives at Room Temperature Using Recyclable Alumina-Supported Heteropolyoxometalates

Table 4

Effect of time of reaction on azlactone yields (%).

Entry	Reaction time (min)	Yield^a (%)
1	15	48
2	30	71
3	60	80
4	120	92
5	180	90

Reaction conditions: o-phenylenediamine, 1 mmol; benzyl, 1 mmol; toluene, 7 mL; supported catalyst: AlCuMoVP, 100 mg; 25°C.