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Effect of the Amount of Triflic Acid
 | |||||||
|---|---|---|---|---|---|---|---|
| entry | TfOH loading (mol%) | Temperature(°C) | reaction time (h) | conversiona (%) | 7:8 ratioa | 7 yield(%)b | 7 α:β ratioa |
| 1 | 10 | 25 | 1 | 100 | 3:1 | 73 | 10:1 |
| 2 | 5 | 25 | 3 | 85 | 11:1 | 78 | 10:1 |
| 3 | 1 | 25 | 24 | 35 | >99:1 | 34 | 10:1 |
| 4 | 1 | 35 | 12 | 95 | >99:1 | 78 | 10:1 |
Determined by 1H NMR analysis.
Isolated yield
