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Optimization of ligands.
| Entry | Ligand/ precursor | Yield [%][a] | Entry | Ligand/ precursor | Yield [%][a] |
|---|---|---|---|---|---|
| 1 | none | 0 | 8 |
|
50 |
| 2 | PPh3 | 2 | 9 |
|
24 |
| 3 |
|
6 | 10 |
|
92 |
| 4 |
|
0 | 11 |
|
71 |
| 5 |
|
8 | 12 |
|
99 |
| 6 |
|
0 | 13 |
|
99 |
| 7 |
|
0 | 14 |
|
99 |
[a] Yield of 2 a, determined by 1H NMR spectroscopy (1,3,5‐trimethoxybenzene as an internal standard).
