| entry | catalyst | solvent | Temp/time | React medium/yielda |
| 1 2 3 | Bi(OTf)3, 10 mol% Bi(OTf)3, 20 mol % Bi(OTf)3, 30 mol % | EtOH EtOH EtOH | 80˚C/6 h 80˚C/6 h 80˚C/6 h | One-pot, reflux/86% One-pot, reflux/84% One-pot, reflux/85% |