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. 2024 Apr 3;14(16):10842–10857. doi: 10.1039/d4ra00629a

Comparative study of Fe3O4@SiO2-NH-GA-[(CH2)4-SO3H]3 for the one-pot, three-component synthesis of 4a.

Entry Catalyst Condition Yield (%) Recovered run Ref.
1 Fe3O4–TiO2–SO3H Solvent-free/110 °C, 50 min 95 5 44
2 Fe3O4@TiO2@O2PO2(CH2)2NHSO3H Solvent-free/90 °C, 20 min 90 5 45
3 Nano-ZrO2-SO3H Solvent-free/100 °C, 50 min 89 5 46
4 Fe3O4@SiO2-NH-GA-[(CH2)4-SO3H]3 H2O/60 °C, 60 min 92 8 This work