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Evaluating epimerization conditions
 | |||
|---|---|---|---|
| entrya | conditions | % recovered 2a-anti | % yield 2a-syn |
| 1 | Standard conditions | <5 | 85 |
| 2 | No NaOAc | <5 | 74 |
| 3 | No DCB | 67 | 21 |
| 4 | No NaOAc, no DCB | 62 | 15 |
| 5b | No NaOAc, no DCB, [Ir(dtbbpy)(ppy)2]PF6 | <5 | 72 |
Yields determined by 1H NMR spectroscopy with 2,6-dimethoxytoluene as the external standard.
16 h reaction time.
