Screening the model reaction in the presence of desired catalyst.
| Entry | Catalyst | Yield (%) |
|---|---|---|
| 1 | Fe3O4 | 40 |
| 2 | Fe3O4@SiO2 | 40 |
| 3 | Fe3O4@SiO2@(CH2)3–urea–quinoline | 65 |
| 4 | Fe 3 O 4 @SiO 2 @(CH 2 ) 3 –urea–quinoline sulfonic acid chloride | 85 |
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