Tert-butyl 4-{3-[(3R)-3-{[(1S)-3-tert-butoxy-1-(5-{[4-(2-fluoroethoxy)phenyl]ethynyl}pyridin-3-yl)-3-oxopropyl]carbamoyl}piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate → tert-butyl 4-{3-[(3R)-3-{[(1S)-3-tert-butoxy-1-(5-{2-[4-(2-fluoroethoxy)phenyl]ethyl}pyridin-3-yl)-3-oxopropyl]carbamoyl}piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate

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Tert-butyl 4-{3-[(3R)-3-{[(1S)-3-tert-butoxy-1-(5-{[4-(2-fluoroethoxy)phenyl]ethynyl}pyridin-3-yl)-3-oxopropyl]carbamoyl}piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate (20 mg, 30 μmol) in ethyl acetate (0.8 mL) and methanol (013 mL) was stirred for 4.45 hours at room temperature under a hydrogen atmosphere in the presence of palladium on charcoal (10%, 19 mg). The suspension was filtrated through celite, which were washed thoroughly with methanol. The solution was concentrated under reduced pressure and purified by preparative HPLC to yield 13.9 mg of tert-butyl 4-{3-[(3R)-3-{[(1S)-3-tert-butoxy-1-(5-{2-[4-(2-fluoroethoxy)phenyl]ethyl}pyridin-3-yl)-3-oxopropyl]carbamoyl}piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate.

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