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)propanoic acid (Int-XV, 30 mg, 0.067 mmol), BOP (29.8 mg, 0.067 mmol), 4-methylmorpholine (27.3 mg, 0.269 mmol), and 2-aminoethanol (6.17 mg, 0.101 mmol) were added to DMF (1 mL). The reaction mixture was stirred for 1 h and then purified by prep HPLC (PHENOMENEX® 21×250 mm, gradient elution with Method 1—MeOH/water containing 0.1% trifluoroacetic acid as defined above, 0% B to 100% B over 30 min, 25 mL/min, 220 nM, product retention=30.0 min) to provide (R/S)-2-hydroxy-N-(2-hydroxyethyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)propanamide (6 mg, 9.83 μmol, 14.59% yield): LCMS=489.0 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.10-8.21 (2 H, m), 7.53-7.92 (7 H, m), 3.60 (2 H, td, J=5.61, 3.74 Hz), 3.33-3.43 (2 H, m), 1.80 (3 H, s); HPLC peak RT=9.0 min (Method A).

1. custompurified by prep HPLC (PHENOMENEX® 21×250 mm, gradient elution with Method 1—MeOH/water containing 0.1% trifluoroacetic acid as defined above, 0% B to 100% B over 30 min, 25 mL/min, 220 nM, product retention=30.0 min)