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To a solution of (S)-2-((1-(3-methylbutanoyl)piperidin-3-yl)methoxy)-6-nitrobenzonitrile (Example 5c, 43.26 g, ˜18.0 mmol) in glacial acetic acid (35 mL) cooled to 0° C. in an ice bath was added iron powder (2.02 g, 36.1 mmol). The solution was stirred under a N2 balloon at 0° C. for 10 minutes then at room temperature overnight and filtered through a bed of Celite, rinsing well with EtOAc. The EtOAc solution was then washed successively with 2N Na2CO3, water, and brine, dried over Na2SO4, filtered and concentrated to give the crude product as an orange oil. The residue was purified by silica gel chromatography using a 0-60% EtOAc/Hexanes gradient followed by crystalization from EOAc/Hexane to afford the title compound a pale yellow solid (27.01 g, 85.63 mmol, 71% over two steps). 1H NMR (400 MHz, DMSO-d6) 20° C.) δ 0.79-0.92 (3×d, J=6.4 Hz, 6H), 1.19-1.46 (m, 2H), 1.51-2.01 (m, 4H), 2.03-2.25 (m, 2H), 2.57 (dd, J=10.4, 12.8 Hz, 0.3H), 2.75-2.88 (m, 0.6H), 2.92-3.10 (m, 1H), 3.65-4.08 (m, 3.6H), 4.27-4.40 (dm, 0.3H), 5.98 & 6.00 (s & s, 2H), 6.18 (pseudo t, J=8.4 & 9.2 Hz, 1H), 6.32 (pseudo d, J=8.4 Hz, 1H), 7.11-7.21 (m, 1H). MS 316 (MH+).

1. filtrationat room temperature overnight and filtered through a bed of Celite
2. washrinsing well with EtOAc
3. washThe EtOAc solution was then washed successively with 2N Na2CO3, water, and brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto give the crude product as an orange oil
8. customThe residue was purified by silica gel chromatography
9. customfollowed by crystalization from EOAc/Hexane