Table 2. Gold(III)-Catalyzed Cyclization of the Internal Alkyne N-Propargylbenzamide (7).
| entry | catalyst | product | yield (%)a |
|---|---|---|---|
| 1 | 1a | 10 | 8 |
| 2 | 2a | 10 | ∼1 |
| 3 | 1b | 8 | 72 |
| 4 | 2b | 8 | 81 |
| 5 | AuCl3 | 8 and 9 | 65:30 |
Yields are reported as isolated yields following purification by flash column chromatography. Where only one product is shown, only trace quantities of the other products (8–10) could be identified in the crude mixture by 1H NMR analysis.
