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Reagents and conditions: (a)614i-PrMgCl·LiCl (1.1 equiv), THF, −40 °C, then 329.1 (0.4 equiv), −40 °C to rt, 2 h; (b) (1) 25% H2SO4, 1,2-dichloroethane, 60 °C, 11 h, (2) DDQ (10 equiv), DCM, rt, 15 min, (3) ascorbic acid (10 equiv), DCM/MeOH.
