Comparison of the results obtained from the synthesis of 2-amino-4-(4-chlorophenyl)-5-oxo-4H,5H-pyrano[3,2-c]chromene-3-carbonitrile using Zr@IL-Fe₃O₄ MNPs with other reported strategies^a.

Entry	Catalyst	Solvent	Time (min)	Yield (%)	Ref.
1	SDS	20 mol%/H2O/60 °C	150	88	47
2	MNP@AVOPc	20 mg/solvent-free/25 °C	15	94	62
3	[Sipim]HSO4	0.1 mmol/solvent-free/100 °C	30	95	63
4	Nano Al2O3	25 mol%/EtOH/25 °C	300	80	64
5	t-ZrO2 NPs	10 mol%/H2O/80 °C	35	91	65
6	DMAP	20 mol%/EtOH/reflux	300	94	66
7	DTP/SiO2	20 mol%/DMF/60 °C	35	92	67
8	MgO	0.5 mmol%/H2O/reflux	120	84	68
9	Zr@IL-Fe3O4 MNPs	20 mg/solvent-free/100 °C	15	96	This work

^aReaction conditions: 4-hydroxycoumarin (1 mmol), malononitrile (1.2 mmol), 4-chlorobenzaldehyde (1 mmol).