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Table 3 Comparison of catalytic activity of Nano-SiO2/AEP with other catalysts

From: A green protocol ball milling synthesis of dihydropyrano[2,3-c]pyrazole using nano-silica/aminoethylpiperazine as a metal-free catalyst

Entry

Conditions

Time (min)

Yield (%)

References

Temp. (℃), Solvent, Catalyst

1

Reflux, EtOH, NAPT

30

82

[46]

2

Reflux, EtOH, RuIII@CMC/Fe3O4

30

93

[42]

3

Reflux, EtOH, PS-DABCO

120

84

[43]

4

r. t., H2O, Piperidine

5–10

89

[47]

5

Reflux, EtOH, Et3N

15

72

[48]

6

r. t., no solvent, Nano-SiO2/AEP

5

95

This work