Dichloromethane → Methyl {4-[({6-[2-fluoro-4-(methylsulfonyl)phenyl]-3-pyridinyl}oxy)methyl]-1-piperidinyl}(oxo)acetate

Participants

Reaction Steps

A solution of 1,1-dimethylethyl 4-[({6-[2-fluoro-4-(methylsulfonyl)phenyl]-3-pyridinyl}oxy)methyl]-1-piperidinecarboxylate (0.15 g, 0.32 mmol) in CH2Cl2 (10 mL) was treated with TFA (0.3 mL). The mixture was stirred at ambient temperature overnight. CH2Cl2 and excess of TFA were removed under reduced pressure. The residue was redissolved in CH2Cl2 (5 mL) and cooled in an ice bath. Diisopropylethylamine (1.5 mL) was added, followed by addition of methyl oxalyl chloride (34 μL, 0.36 mmol). The reaction mixture was allowed to warm up to ambient temperature and stirred overnight, quenched with aqueous NaHCO3 and extracted with EtOAc (50 mL×2). The combined organic extract was washed with brine and dried over Na2SO4, filtered, and the filtrate was concentrated to a viscous brown oil. The crude material was purified by chromatography on a silica gel column eluted with 1:5 acetone/CH2Cl2 to give 0.112 g (77%) of the title compound as a white solid. 1H NMR (400 MHz, CDCl3): δ 8.42 (d, 1H, J=2.9 Hz), 8.23 (t, 1H, J=7.8 Hz), 7.85-7.80 (m, 2H), 7.73 (dd, 1H, Ja=10.3 Hz, Jb=1.5 Hz), 7.27 (dd, 1H, Ja=10.8 Hz, Jb=2.9 Hz), 4.65-4.55 (m, 1H), 4.00-3.90 (m, 2H), 3.88 (s, 3H), 3.80-3.70 (m, 1H), 3.25-3.10 (m, 1H), 3.09 (s, 3H), 2.80-2.70 (m, 1H), 2.25-2.10 (m, 1H), 200-1.90 (m, 2H), 1.50-1.35 (m, 2H); LRMS (APCI), m/z 451 (M+H).

Provenance & Evidence