4-Methylmorpholine → 2-hydroxy-N-(oxazol-5-ylmethyl)-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), oxazol-5-ylmethanamine, HCl (19.65 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=11.6 min) to give single enantiomer 2-hydroxy-N-(oxazol-5-ylmethyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (17.2 mg, 0.032 mmol, 38.8% yield): LCMS=512.3 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.13-8.25 (2 H, m), 7.66-7.78 (4 H, m), 7.54-7.66 (4 H, m), 6.04 (1 H, s), 5.19 (1 H, s), 4.51 (2 H, s). HPLC Peak RT=10.1 min (Analytical Method D).

Provenance & Evidence