Table 9.
Influence of the Ligand on the Regioselectivity
 | ||||
|---|---|---|---|---|
| entry | SM | R | yield 40 | yield 41 |
| 1 | 38 | TBDMS | 93 | 0 |
| 2 | 39 | TBDMS | 86 | 0 |
| 3 | 38 | Benzoyl | 93 | 0 |
| 4 | 39 | Benzoyl | 11 | 75 (dppe) |
| 5 | 38 | Acetyl | 40 | 60 |
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