| Conditions | Reaction time/min | Yield/% | |||
| Indol | Benzofuran | Benzotiophene | Indene | ||
| Microwave | 5 | 0 | 0 | 10.0 | 29.8 |
| 10 | 0 | 0 | - | - | |
| Conventional | 120 | 0 | 0 | 9.6 | 31.5 |