| Entry | R | Product | Yield(%)b |
| 1 | C6H5 | 3a | 91 |
| 2 | 4-Cl-C6H4 | 3b | 98 |
| 3 | 4-CH3-C6H4 | 3c | 88 |
| 4 | 4-(CH3)2CH-C6H4 | 3d | 73 |
| 5 | 4-PhCH2O-C6H4 | 3e | 15 |
| 6 | 2-Naphthyl | 3f | 6 |