Hexachloroethane → 3-(cis-2,6-Dimethyl-piperidin-1-yl)-6-fluoro-[1,2,4]triazolo[4,3-a]pyridine

Participants

Reaction Conditions

Reaction Steps

To an ice cold solution of Intermediate 96a (1.38 g, 5.19 mmol) in THF (50.0 mL) was added sequentially triphenylphosphine (2.72 g, 10.4 mmol), Et3N (2.89 mL, 20.8 mmol) and hexachloroethane (2.46 g, 10.4 mmol). The cooling bath was removed and the reaction was heated to 55° C. overnight. The reaction was cooled and partitioned between EtOAc and water. The aqueous layer was then extracted with EtOAc (3×). The combined organic layers were washed with brine, dried (MgSO4), filtered and evaporated in vacuo. The residue was taken up in MeOH and loaded onto an SCX-2 cartridge, which was washed with MeOH and eluted with 2M NH3 in MeOH. The residue was concentrated in vacuo then resubmitted to the reaction conditions overnight. After analogous workup the residue was concentrated in vacuo to give the title compound (1.03 g, 80%). NMR (300 MHz, CDCl3): 0.68 (6H, d, J 6.2 Hz), 1.36-1.68 (3H m), 1.74-1.90 (3H, m), 3.35 (2H, m), 7.14 (1H, ddd, J 9.8, 7.5, 2.3 Hz), 7.65 (1H, ddd, J 9.9, 4.7, 0.8 Hz), 8.02 (1H, ddd, J 3.2, 2.3, 0.8 Hz).

Provenance & Evidence