4-Methylmorpholine → (R/S)-N-ethyl-3-(2-hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)propanamide

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Reaction Steps

(R/S)-3-(2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)propanoic acid (Example 22, 22 mg, 0.044 mmol), ethanamine-HCl (5.36 mg, 0.066 mmol), 4-methylmorpholine (17.72 mg, 0.175 mmol), and HATU (21.65 mg, 0.057 mmol) were added to DMF (1 mL). This was stirred for 1 h and then 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 13.4) to provide (R/S)-N-ethyl-3-(2-hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)propanamide (8 mg, 0.015 mmol, 33.5% yield): LCMS=530.3 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.10-8.23 (2 H, m), 7.52-7.74 (7 H, m), 5.11 (1 H, s), 3.43-3.57 (2 H, m), 3.17 (2 H, q, J=7.41 Hz), 2.40 (2 H, t, J=6.71 Hz), 1.09 (3 H, t, J=7.26 Hz); HPLC peak RT=8.6 min (Method A).

Provenance & Evidence