| SI. No. | Isatin a | Indole b | Product c | Yield %[a] |
| 1 | R = H | R1 = H, R2 = H, R3= H | 1c | 31 |
| 2 | R = H | R1 = H, R2 = Me, R3 = H | 2c | 76 |
| 3 | R = H | R1 = H, R2 = H, R3 = OMe | 3c | 64 |
| 4 | R = H | R1 = H, R2 = H, R3 = NO2 | 4c | 00 |
| 5 | R = allyl | R1 = H, R2 = H, R3= H | 5c | 34 |
| 6 | R = allyl | R1 = Me, R2 = H, R3= H | 6c | 56 |
| 7 | R = allyl | R1 =H, R2 = Me, R3 =H | 7c | 90 |
| 8 | R = allyl | R1 = H, R2 = H, R3 = OMe | 8c | 97 |
| 9 | R = benzyl | R1 = H, R2 = H, R3= H | 9c | 40 |
| 10 | R = benzyl | R1 = H, R2 = H, R3= H | 10c | 56 |
| 11 | R = benzyl | R1 =H, R2 = Me, R3 =H | 11c | 92 |
| 12 | R = benzyl | R1 = H, R2 = H, R3 = OMe | 12c | 98 |
| 13 | R = propargyl | R1 = Me, R2 = H, R3= H | 13c | 58 |
| 14 | R = propargyl | R1 = H, R2 = H, R3 = OMe | 14c | 89 |
| 15 | R = propargyl | R1 = H, R2 = H, R3 = OMe | 15c | 96 |