A novel heterogeneous acid–base nano-catalyst designed based on graphene oxide for synthesis of spiro-indoline-pyranochromene derivatives

Table 3 Comparison of the nano-GO/3-aminopyridine with other catalysts in the synthesis of spiro-indoline-pyranochromene derivatives

Entry	Catalyst/Temp/Time/Solvent	Yield (%)	Refs.
1	[Dabco-H]Cl /50^OC /2 h /CH₃CN	95	[28]
2	BN@Fe₃O₄ /80 °C/45 min/Water	88	[29]
3	Et₃N/75^OC /45 min /EtOH	90	[19]
4	Nano-GO/3-aminopyridine/r.t/20 min/solvent-free	95	This work

ISSN: 2661-801X