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| Entry | Catalyst/condition | Time (min) | Yieldab (%) | Ref. |
|---|---|---|---|---|
| 1 | TiCl4/Zn, THF, reflux | 240 min | 83 | Previous work37 |
| 2 | N2H4/H2O, reflux | 210 min | 80 | Previous work38 |
| 3 | KMnO4/AcOH, reflux | 360 min | 65 | Previous work39 |
| 4 | γ-Fe2O3@CPTMS–guanidine@SO3H/solvent free, MW (180 W, max. 70 °C) | 15 min | 92 | Present work |
Isolated yields.
The reaction was carried out under microwave irradiation (MW) conditions.
