Scheme 1.
a) NaH/allyl bromide/DMF; b) MCPBA/DCM; c) (L)Leu-OCH3 or (L)Cha-OCH3/TFE; d) CDI/THF; e) LiOH/aq.THF; f) EDCI/HOBt/DIEA/DMF; g) 2M LiBH4/THF/CH3OH; h) Dess-Martin periodinane/DCM; h) NaHSO3/EtOAc/CH3CH2OH/H2O
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