Table 3. Reactions of 1A with Other Acids.

| entry | HX | product | yield (%) | |
|---|---|---|---|---|
| 1 | HBr | 2b | 5Ab | 70 |
| 2a | HI | 2c | 5Ac | 97 |
| 3 | HF | 2d | 5Ad | 0 |
| 4 | MeSO3H | 2e | 5Ae | 0 |
| 5 | PhSO3H | 2f | 5Af | 0 |
| 6 | CF3COOH | 2g | 5Ag | 0 |
| 7 | t-BuCOOH | 2h | 5Ah | 0 |
| 8 | AcOH | 2i | 5Ai | 0 |
At 60 °C.

| entry | HX | product | yield (%) | |
|---|---|---|---|---|
| 1 | HBr | 2b | 5Ab | 70 |
| 2a | HI | 2c | 5Ac | 97 |
| 3 | HF | 2d | 5Ad | 0 |
| 4 | MeSO3H | 2e | 5Ae | 0 |
| 5 | PhSO3H | 2f | 5Af | 0 |
| 6 | CF3COOH | 2g | 5Ag | 0 |
| 7 | t-BuCOOH | 2h | 5Ah | 0 |
| 8 | AcOH | 2i | 5Ai | 0 |
At 60 °C.