Table 3.
Synthesis of 3-alkynyl and allenyl esters via enyne dianions
 | ||||
|---|---|---|---|---|
| entry | R | R’3Si | Product (% yield)a | |
| 1 | Et | TMS | 9c (25) | 18a (55) |
| 2 | Et | TIPS | - | 18b (78) |
| 3 | H | TMS | 19 (87) | - |
a
Isolated yields.
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