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Asymmetric oxidation of 3-substituted cyclopentane-1,2-diones 87a–f with the Ti(O-iPr)4/(+)DET/t-BuOOH system.
 | |||
| γ-Lactone acid | R | Yield, % | ee, % |
| 88a | -CH3 | 75 | 93 |
| 88b | -C2H5 | 72 | 93 |
| 88c | -CH2-OBn | 75 | 96 |
| 88d | -Bn | 83 | 96 |
| 88e | -C6H5 | 38 | 86 |
| 88f | 4-F-C6H4- | 43 | 86 |
