Scheme 6.
Reagents and conditions: (a) Dess-Martin periodinane, DCM, r.t., 16 h; (b) TFA, DCM, r.t., 16 h; (c) 3-Cyclohexylpropanoyl chloride or cyclohexanecarbonyl chloride, Et3N, THF, r.t., 15 min.
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