Table 2. Photochemical Oxidative Cyclization To Form (−)-Pseudovincadifformine.
| entry | oxidant | yield (%) |
|---|---|---|
| 1 | air | 0 |
| 2 | BrCCl3 (3 equiv) | 22 |
| 3 | 2 (3 equiv) | 34 |
| 4 | 34 (3 equiv) | 39 |
| 5a | 34 (3 equiv) | 58 |
a
Flow reactor, tR = 5 min.
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