S.No | Catalyst | Solvent used | Time | Yield (%) | Ref. No |
1 | KF-Al2O3 | C2H5OH | 3 - 5 h (reflux) | 92 | [19] |
2 | Piperdine | C2H5OH | 1 h (reflux) | 75 | [23] |
3 | Na2CO3 | C2H5OH | 3 h (stirrring at RT) | 81 | [27] |
4 | InCl3 | C2H5OH | 7 min (microwave) | 90 | [31] |
5 | BF3-SiO2 | Solvent free | 12 min (reflux) | 95 | [32] |
6 | C2H5OH:H2O | C2H5OH | 9 h (reflux) | 95 | [33] |
7 | p-TsOH | C2H5OH | 30 min (ultrasonication) | 95 | [34] |
8 | L-Proline | C2H5OH | 1 h (reflux) | 91 | [35] |
9 | Nano CoFe2O4 | C2H5OH | 20 min (microwave) | 92 |
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