Epoxide 23. Compound 22 (150 mg, 0.55 mmol) was dissolved in dichloromethane (5 mL) and cooled (ice bath). m-Chloroperbenzoic acid (150 mg, 0.65 mmol, 70%) was added and the mixture was left (ice bath) for 12 h and then chromatographed (A1203, CH2C12/EtOAc 1:l) to give 23 [oil, 68 mg, 43%; ala^ + 6 4 O
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