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Reagents and conditions: (a) TBAF in THF; then reagent 173, CH2Cl2, 1H-tetrazole, then MCPBA; (b) ceric ammonium nitrate, MeCN, H2O; then (MeO)(BnO)PNiPr2, CH2Cl2, 1H-tetrazole; then MCPBA; (c) palladium black, H2, tert-butanol, H2O, NaHCO3.
