4-Methylmorpholine → 3-(2-hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)-N,N-dimethylpropanamide

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Reaction Steps

3-(2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)propanoic acid (Example 4, 35 mg, 0.070 mmol) was dissolved in DMF (1 mL) prior to the addition of dimethylamine-HCl (11.36 mg, 0.139 mmol), 4-methylmorpholine (0.046 mL, 0.418 mmol), and BOP (61.6 mg, 0.139 mmol). This was stirred for 1 h and was then purified by preparative HPLC (PHENOMENEX® Luna 5u C18 21.2×250 mm, gradient elution with Method 1—MeOH/water containing 0.1% trifluoroacetic acid as defined above, 0% B to 100% B over 30 min, 15 mL/min, 220 nM, product retention time=33.5 min) to give 3-(2-hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamido)-N,N-dimethylpropanamide (16.1 mg, 0.030 mmol, 42.8% yield) as a single enantiomer. LCMS=530.3 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.17 (2 H, d, J=8.36 Hz), 7.69 (4 H, d, J=8.14 Hz), 7.49-7.65 (3 H, m), 5.11 (1 H, s), 3.51 (2 H, t, J=6.49 Hz), 2.98 (3 H, s), 2.92 (3 H, s), 2.60 (2 H, t, J=6.60 Hz). HPLC Peak RT=9.6 min (Analytical Method D).

Provenance & Evidence