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0 °C

To a solution of (R)-2-((2-cyano-3-nitrophenoxy)methyl)piperidin-1-ium 2,2,2-trifluoroacetate (Example 16c, 2.26 g, 6.03 mmol) in anhydrous DCM (50 mL) was added triethylamine (4.2 mL, 30.1 mmol) at room temperature. The reaction mixture was cooled down to 0° C. and butyryl chloride (0.95 mL, 9.05 mmol) was added and the solution stirred at room temperature overnight. The solvent was then removed under reduced pressure and the residue was diluted with EtOAc (150 mL), the organic layer was washed successively with water, brine and dried over Na2SO4, filtered and evaporated. The residue was purified by Biotage SP-1 (40s column) eluting with EtOAc/Hexane (10%-70%) to give the desired product (1.5 g, 75%). MS 332 (MH+).

1. customThe solvent was then removed under reduced pressure
2. additionthe residue was diluted with EtOAc (150 mL)
3. washthe organic layer was washed successively with water, brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by Biotage SP-1 (40s column)
8. washeluting with EtOAc/Hexane (10%-70%)