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

Table 5

Catalyst reuse on 4-benzylidene-2-phenyloxazol-5-one yields (%).

Entry	Cycle	Yield^a (%)
1	0	92
2	1	90
3	2	90
4	3	88

Reaction conditions: o-phenylenediamine, 1 mmol; benzyl, 1 mmol; toluene, 10 mL; 100 mg of supported catalyst; 120 min; 25°C.
^aIsolated yield.