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| entry | internal alkyne |
yield | rr (A:B:C) |
major regioisomer |
|---|---|---|---|---|
| 1 |
|
70 | 28:1:1 |
|
| 2 |
|
50 | 15:2:1 |
|
| 3 |
|
52 | 4:0:1 |
|
| 4 |
|
63 | 1.0:1.5:1.0 |
|
| 5 | R=PMB;45 | 82 | 3:1:0 | R=PMB;46 |
| 6 |
|
87 | 5:1:0 |
|
| 7 |
|
70 | 6:1:0 |
|
Note: For entries 5-7, no deprotonation step was necessary.
