Triethylamine → N-[(4aR,6R,8aS)-8a-(2,4-difluoro-5-{[(2,2,2-trifluoroethyl)amino]methyl}phenyl)-6-(fluoromethyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]benzamide

Participants

Reaction Conditions

Reaction Steps

A solution of N-[(4aR,6R,8aS)-8a-[5-(aminomethyl)-2,4-difluorophenyl]-6-(fluoromethyl)-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]benzamide (C26) (0.598 g, 1.33 mmol) in acetonitrile (13 mL) was treated with triethylamine (0.277 mL, 2.00 mmol) and 2,2,2-trifluoroethyl trifluoromethanesulfonate (0.288 mL, 2.00 mmol). The reaction vial was sealed and the resulting solution was stirred at 70° C. for 16 hours. The reaction mixture was cooled to room temperature and concentrated under reduced pressure to yield a brown solid. The solid was partitioned between water (100 mL) and ethyl acetate (100 mL). The organics were isolated and the aqueous layer was extracted further with ethyl acetate (2×50 mL). The combined organics were then washed with brine (100 mL), dried over sodium sulfate, filtered and concentrated under reduced pressure. Purification via silica gel chromatography (Gradient: 0% to 60% ethyl acetate in heptane) afforded the product as a white solid. Yield: 0.4064 g, 57%. LCMS m/z 532.0 [M+H+]. 1H NMR (400 MHz, CD3OD) δ 8.12 (br d, J=8 Hz, 2H), 7.45-7.59 (m, 3H), 7.08 (dd, J=12.3, 9.6 Hz, 1H), 4.50-4.52 (m, 1H), 4.38-4.40 (m, 1H), 4.15 (dd, J=12.1, 2 Hz, 1H), 3.90-3.94 (m, 3H), 3.00 (dd, J=13.4, 4.0 Hz, 1H), 2.77 (dd, J=13.1, 2.9 Hz, 1H), 1.87-1.96 (m, 1H), 1.69-1.72 (m, 1H).

Provenance & Evidence