反应详情

(R/S)-2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetic acid (Int-V, 20 mg, 0.046 mmol) was dissolved in DMF (1 mL) prior to the addition of 4-methylmorpholine (0.031 mL, 0.278 mmol), 2-(methylsulfonyl)ethanamine (10.28 mg, 0.083 mmol), and BOP (36.9 mg, 0.083 mmol). The reaction mixture was stirred overnight and was then purified via preparative LCMS with the following conditions: Column: Waters XBridge C18, 19×250 mm, 5-μm particles; Guard Column: Waters XBridge C18, 19×10 mm, 5-μm particles; Mobile Phase A: 5:95 methanol:water with 10-mM ammonium acetate; Mobile Phase B: 95:5 methanol:water with 10-mM ammonium acetate; Gradient: 50-100% B over 25 minutes, then a 5-minute hold at 100% B; Flow rate=20 mL/min. Fractions containing the desired product were combined and dried via centrifugal evaporation to give (R/S)-2-hydroxy-N-(2-(methylsulfonyl)ethyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (9.2 mg, 0.017 mmol, 36.2% yield): LCMS=537.1 [M+H]+; 1H NMR (400 MHz, methanol-d4 and CDCl3) δ ppm 8.15 (2 H, d, J=8.28 Hz), 7.66 (4 H, t, J=7.78 Hz), 7.47-7.60 (3H, m), 5.13 (1 H, s), 3.73 (2 H, t, J=6.40 Hz), 3.23-3.31 (2 H, m), 2.94 (3 H, s); Analytical LCMS: column: Mac-mod Halo C18, 4.6×50 mm, 2.7-μm particles; Mobile Phase A: 5:95 acetonitrile:water with 0.05% TFA; Mobile Phase B: 90:10 acetonitrile:water with 0.05% TFA; Temperature: 45° C.; Gradient: 0-100% B over 4 minutes, flow rate=4 mL/min, product retention=2.4 min.

1. customwas then purified via preparative LCMS with the following conditions
2. waitGradient: 50-100% B over 25 minutes
3. customa 5-minute hold
4. additionFractions containing the desired product
5. customdried via centrifugal evaporation