Scheme 2. Derivatization. (a) TFA, Et2O, 0 °C to rt, then SOCl2, MeOH, 0 °C to rt, 78% yield over two steps, 94 : 6 er. (b) m-CPBA, CH2Cl2, 0 °C, 2 h, 96% yield, 94 : 6 er. (c) DIBAL-H, THF, –60 °C, 2 h, 93% yield, 93 : 7 er.
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