4-Methylmorpholine → 2-hydroxy-N-((5-methyl-1,3,4-oxadiazol-2-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-Va, 35 mg, 0.081 mmol) was dissolved in DMF (1 mL) prior to the addition of 4-methylmorpholine (0.054 mL, 0.487 mmol), (5-methyl-1,3,4-oxadiazol-2-yl)methanamine (16.52 mg, 0.146 mmol), and BOP (64.6 mg, 0.146 mmol). This was stirred overnight and was then purified by preparative HPLC (PHENOMENEX® Luna 5u C18 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 time=11.5 min) to give single enantiomer 2-hydroxy-N-((5-methyl-1,3,4-oxadiazol-2-yl)methyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (15.1 mg, 0.027 mmol, 33.7% yield): LCMS=527.3 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.13-8.24 (2 H, m), 7.66-7.78 (4 H, m), 7.54-7.66 (3 H, m), 5.21 (1 H, s), 4.63 (2 H, d, J=3.30 Hz), 2.49 (3 H, s). HPLC Peak RT=9.2 min (Analytical Method C).

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