Table 1.
Completion of Oxindole Core
 | ||
|---|---|---|
| reagents | compound | yield |
| TFA | 32 & 33 | not determined |
| BF3 · OEt3 | 34 & 35 | 18% & 34% |
| Burgess Reagent | 34 | 48% |
| Yb(OTf)3 | 35 | 50% |
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