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Reagents and conditions; Method 6: (i) (a) NIS, 4 Å MS, anhyd. CH2Cl2, −10 °C, 10 min; (b) 7, TfOH, −10 °C, 3 h, 70%. (ii) 2.5 M NaOMe, MeOH, rt, o/n, 96%; (iii) Dess–Martin periodinane, anhyd. CH2Cl2, rt, 16 h; (iv) L-selectride, anhyd. THF, −78 °C, 10 min, 44% over two steps.
