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A cooled (0° C.), stirred suspension of tert-butyl (1-(5′-chloro-3,5-dimethyl-[2,4′-bipyridin]-2′-yl)piperidin-4-yl)carbamate (550 mg, 1.32 mmol) in acetonitrile (13 mL) was treated with Selectfluor® (827 mg, 2.24 mmol) portionwise. A light yellow solution was obtained and stirring was continued for 2 h. LC-MS showed the reaction was ˜70% complete. The reaction was quenched with water at this point to avoid more by-product formation. EtOAc was added and layers were separated. The aqueous layer was extracted with EtOAc (2×). The organic extract was dried over sodium sulfate and concentrated to give the crude product, which was purified on ISCO separation system with a 12-gram column using 0-40% EtOAc in heptane to afford 164 mg (29%) of white foam: LRMS (M+H)+: 435.1; 1H NMR (400 MHz, CDCl3) δ 1.43-1.50 (m, 11 H), 2.03 (d, J=12.13 Hz, 2 H), 2.14 (s, 3 H), 2.39 (s, 3 H), 2.90-3.12 (m, 2 H), 3.69 (br. s., 1 H), 3.87-4.08 (m, 2 H), 4.48 (br. s., 1 H), 7.46 (s, 1 H), 8.09 (s, 1 H), 8.40 (s, 1 H).

1. customA light yellow solution was obtained
2. stirringstirring
3. customThe reaction was quenched with water at this point
4. additionEtOAc was added
5. customlayers were separated
6. extractionThe aqueous layer was extracted with EtOAc (2×)
7. extractionThe organic extract
8. dry with materialwas dried over sodium sulfate
9. concentrationconcentrated
10. customto give the crude product, which
11. customwas purified on ISCO separation system with a 12-gram column