4-Methylmorpholine → 2-hydroxy-N-((5-methylisoxazol-3-yl)methyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide

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Reaction Steps

2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetic acid (Int-V, 25 mg, 0.058 mmol), (5-methylisoxazol-3-yl)methanamine (9.75 mg, 0.087 mmol), HATU (28.7 mg, 0.075 mmol), and 4-methylmorpholine (23.45 mg, 0.232 mmol) were added to DMF (1 mL). This was stirred for 1 h before it 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 12 min, 20 mL/min, 220 nM, product retention=14.0 min) to provide 2-hydroxy-N-((5-methylisoxazol-3-yl)methyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (15 mg, 0.028 mmol, 48.2% yield) as a single enantiomers. LCMS=526.3 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.11-8.23 (2 H, m), 7.50-7.82 (7 H, m), 5.98 (1 H, s), 5.18 (1 H, s), 4.43 (2 H, s), 2.36 (3 H, s); HPLC peak RT=10.0 min (Method A).

Provenance & Evidence