Table 3 Comparison of our results with previously reported methods for the synthesis of indazolophthalazinetriones.

From: Novel L-tryptophan-functionalized zirconium dioxide nanoparticles catalysed one-pot and solvent-free synthesis of 2 H-indazolo [2, 1-b] phthalazine-triones

Catalyst

Reaction conditions

Time (min)

Yield (%)

Ref.

p-TSA

Solvent-free/80°C

10

86

45

([Hnhp][HSO4]) (5 mol%)

solvent-free, 80 °C

7

88

46

Ce(SO4)2·4H2O(10 mol%)

Solvent free, 125 °C

6

78

47

SBA-15 (0.02 g)

TFE, 65 °C

180

92

48

PEG-OSO3H (8 mol%)

Solvent free, 80 °C

13

87

49

CoFe2O4-SC-SO3H (0.5 mol%)

solvent-free, 80 °C

7

90

50

Fe3O4@SiO2-imid-PMAb

Solvent-free/80°C

20

90

39

ZrO2@L-tryptophan (20 mg)

Solvent free, 90 °C

5

96

This work

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