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| Entry | Reaction condition | Solvent | Catalyst (g) | Time | Yield (%) |
|---|---|---|---|---|---|
| 1 | (1a, 2a, 3a) | Distilled water | SiO2–H2SO4 (0.01) | 10 min | 93 |
| 2 | (1a, 2a, 3a) | Distilled water | SiO2–H2SO4 (0.02) | 10 min | 95 |
| 3 | (1a, 2a, 3a) | Distilled water | SiO2–H2SO4 (0.03) | 10 min | 95 |
| 4 | (1a, 2a, 3a) | Dichloromethane | SiO2–H2SO4 (0.01) | 6 h | 72 |
| 5 | (1a, 2a, 3a) | Dichloromethane | SiO2–H2SO4 (0.02) | 6 h | 78 |
| 6 | (1a, 2a, 3a) | Dichloromethane | SiO2–H2SO4 (0.03) | 6 h | 78 |
