Hydrogen Peroxide → (+/-)-5-[({1-[3-(1-Methylethyl)-1,2,4-oxadiazol-5-yl]-4-piperidinyl}methyl)oxy]-2-[4-(methylsulfinyl)phenyl]pyridine

Participants

Reaction Conditions

Reaction Steps

A solution of 5-[({1-[3-(1-methylethyl)-1,2,4-oxadiazol-5-yl]-4-piperidinyl}methyl)oxy]-2-[4-(methylthio)phenyl]pyridine (93.7 g, 221 mol) in 1,1,1,3,3,3-hexafluoro-2-propanol (300 mL) at 5° C. was treated with 30% aqueous H2O2 (29 mL, 287 mol) over a 1.5 h period at such a rate to maintain temperature between approximately 6-10° C. The reaction was stirred at 5° C. for 2.5 h. The reaction was diluted with CH2Cl2 (600 mL), quenched by the addition of saturated aqueous Na2SO3 (400 mL), allowed to warm to room temperature and stirred for 30 min. The organic layer was washed with saturated aqueous Na2SO3 (400 mL×2), brine and was dried over MgSO4 and concentrated to give a tan solid. The solid was recrystallized from MeOH to provide the title compound (83.5 g, 86%) as a pale yellow solid. 1H NMR (400 MHz, CDCl3): δ 8.37 (d, 1H, J=2.7 Hz), 8.07 (d, 2H, J=8.4 Hz), 7.74-7.64 (m, 3H), 7.27 (dd, 1H, Ja=8.7 Hz, Jb=2.8 Hz), 4.30-4.15 (m, 2H), 3.92 (d, 2H, J=6.2 Hz), 3.20-3.05 (m, 2H), 2.87 (septet, 1H, J=6.9 Hz), 2.74 (s, 3H), 2.19-2.01 (m, 1H), 2.00-1.90 (m, 2H), 1.55-1.40 (m, 2H), 1.27 (d, 6H, J=7.0 Hz); LRMS (ESI), m/z 441 (M+H).

Provenance & Evidence