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Regeneration of the catalytic activity in the intermolecular gold(I)-catalyzed [2+2] cycloaddition between 1a and 2a in the presence of a Brønsted acid[a]
| Entry | [Au] (mol%) | Additive (mol%) | Yield [%][b] |
|---|---|---|---|
| 1 | 16 (3) | – | – |
| 2 | 16 (3) | HSbF6⋅6 H2O (3) | 75 |
| 3 | 9a (1.5) | – | 13 |
| 4 | 9b (1.5) | – | 13 |
| 5 | 9a (1.5) | HSbF6⋅6 H2O (1.5%) | 70 |
[a] 23 °C, 8 h.
[b] Yield determined by 1H NMR using 1,4-diacetylbenzene as internal standard.
