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

Table 2

Effect of catalyst silica on quinoxaline yields (%).

Entry	Catalyst	Yield^a (%)
1	None	—
2	Al	—
3	AlCuMoVP	92
4	AlFeMoVP	80

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