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Table 3 Comparison of the efficiency of Fe3O4@PVA-SO3H with that of other reported catalysts in the synthesis of model 4a

From: Design and preparation of Fe3O4@PVA polymeric magnetic nanocomposite film and surface coating by sulfonic acid via in situ methods and evaluation of its catalytic performance in the synthesis of dihydropyrimidines

Entry

Catalyst

Conditions

Time

Yield (%)

Ref

1

SnCl2/nano SiO2

EtOH/reflux

40 min

94

[31]

2

Silica-bonded N-propyl sulfamic acid (SBNPSA)

EtOH/reflux

3–4 h

90–95

[32]

3

nanoZnO (5 mol %)

Solvent free/60 °C

10 h

95

[33]

4

NH4H2PO4 (5 mol %) or NH4H2PO4/SiO2

Solvent free/100 °C

2 h

85

[34]

5

Fe3O4@mesoporous SBA-15

EtOH/65 °C

6 h

85

[35]

6

Fe3O4@PVA-SO3H (50 mg)

EtOH/reflux

10 min

99

This work

  1. aIsolated yield