Scheme 3.
aReagents and conditions: (a) (S)-α-methylbenzylamine; (b) 11, hydroquinone, 60 °C; (c) 10% aq AcOH; (d) NaOMe, MeOH, reflux; (e) isopropenyl acetate; (f) Oxone, acetone; (g) PCC, CH2Cl2.
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