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Directed cycloaddition of 1 and alkynyltrifluoroborates.[a]
 | ||||
|---|---|---|---|---|
| Entry | Lewis acid[a] [(equiv)] | T [°C] | t [min] | Yield3[%] |
| 1 | BF3⋅OEt2 (2) | 25 | 16 h | 29 |
| 2 | BF3⋅OEt2 (2) | 40 | 10 | 43 |
| 3 | BF3⋅OEt2 (3) | 40 | 10 | 84 |
| 4 | Me3SiCl (3) | 40 | 10 | 73 |
A 1:1 stoichiometry of Lewis acid and alkyne was used in all cases.
