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Effects of reaction variables on cyclization of 5a to 6a.
| Catalysta | 25 °C | 70 °C | ||
|---|---|---|---|---|
| Time (h) |
Yield (%) |
Time (h) |
Yield (%) |
|
| Hf(OTf)4 | 12 | 52 | 1.5 | 84 |
| Cu(OTf)2 | 12 | <10 | 3.0 | 31 |
| In(OTf)3 | 12 | <10 | 3.0 | 46 |
| Ce(OTf)4 | 12 | 13 | 1.5 | 51 |
| InCl3 | 12 | <10 | 3.0 | 94 |
| BiOClO4 | 12 | <10 | 6.0 | <10 |
| ZnCl4 | 12 | <10 | 6.0 | <10 |
| MSA | 12 | <10 | 3.0 | 80 |
The molar ratio of the catalyst used was 5% of 5a. MSA = methanesulfonic acid.
