tert-Butyl [(3R)-1-{[(6S)-5-cyano-6-[4-cyano-2-(methylsulfonyl)phenyl]-4-methyl-2-oxo-3-[3-(trifluoromethyl)phenyl]-3,6-dihydropyrimidin-1(2H)-yl]carbonyl}piperidin-3-yl]carbamate → (4S)-3-[(3R)-3-Aminopiperidin-1-yl]carbonyl-4-[4-cyano-2-(methylsulfonyl)phenyl]-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carbonitrile

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tert-Butyl [(3R)-1-{[(6S)-5-cyano-6-[4-cyano-2-(methylsulfonyl)phenyl]-4-methyl-2-oxo-3-[3-(trifluoromethyl)phenyl]-3,6-dihydropyrimidin-1(2H)-yl]carbonyl}piperidin-3-yl]carbamate (Example 12A; 56.0 mg, 0.082 mmol) was dissolved in a 4 N solution of hydrogen chloride in dioxane (2.15 ml) and stirred at RT for 60 min. The contents of the flask was then concentrated under reduced pressure, and the residue was taken up in dichloromethane (15 ml) and 2 N aqueous sodium hydroxide solution (15 ml). After extraction, the organic phase was separated off, dried over sodium sulfate and concentrated under reduced pressure. This gave 47 mg (96% of theory) of the title compound.

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