Table 4.
Ring closure of 4a using ammonium acetate.
| |||
|
| |||
| entry | NH4OAc, equiv | time, h | yield, % |
|
| |||
| 1 | 5 | 15 | 28 |
| 2 | 10 | 15 | 55 |
| 3 | 10 | 60 | 92 |
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