反应详情

(R/S)-2-Hydroxy-2-(4-(5-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetic acid (Int-IX, 30 mg, 0.070 mmol), ethanamine-HCl (8.51 mg, 0.104 mmol), HATU (34.4 mg, 0.090 mmol), and 4-methylmorpholine (28.1 mg, 0.278 mmol) were added to DMF (1 mL). This was stirred for 1 h and then was purified by prep HPLC (PHENOMENEX® Luna 5u 21.2×100 mm, gradient elution with Method 1—MeOH/water containing 0.1% trifluoroacetic acid as defined above, 0% B to 100% B over 10 min, 20 mL/min, 220 nM, product retention 12.1=min) to provide (R/S)-N-ethyl-2-hydroxy-2-(4-(5-(5-phenyl-4-(trifluoromethyl)isoxazol-3-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (25 mg, 0.049 mmol, 69.8% yield): LCMS=459.1 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.14 (2 H, d, J=8.36 Hz), 7.48-7.85 (7 H, m), 5.10 (1 H, s), 3.28 (2 H, dd, J=7.15, 0.99 Hz), 1.14 (3 H, t, J=7.26 Hz); HPLC peak RT=9.2 min (Method A).

1. customwas purified by prep HPLC (PHENOMENEX® Luna 5u 21.2×100 mm, gradient elution with Method 1—MeOH/water containing 0.1% trifluoroacetic acid as defined above, 0% B to 100% B over 10 min, 20 mL/min, 220 nM, product retention 12.1=min)