反应详情

(R/S)-2-Hydroxy-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetic acid (Int-V, 30 mg, 0.070 mmol) was dissolved in DMF (1 mL) prior to the addition of 4-methylmorpholine (0.046 mL, 0.417 mmol), 4-amino-2-methylbutan-2-ol (12.92 mg, 0.125 mmol), and BOP (55.4 mg, 0.125 mmol). This was stirred overnight and was then purified by preparative HPLC (PHENOMENEX® Luna 5u C18 21×250 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=34.1 min) to give (R/S)-2-hydroxy-N-(3-hydroxy-3-methylbutyl)-2-(4-(5-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-1,2,4-oxadiazol-3-yl)phenyl)acetamide (10.5 mg, 0.019 mmol, 26.9% yield): LCMS=517 [M+H]+; 1H NMR (400 MHz, methanol-d4) δ ppm 8.12-8.23 (2 H, m), 7.65-7.77 (4 H, m), 7.54-7.66 (3 H, m), 5.10 (1 H, s), 3.32-3.42 (2 H, m), 1.62-1.78 (2 H, m), 1.22 (6 H, s). HPLC Peak RT=9.2 min (Analytical Method A).

1. customwas then purified by preparative HPLC (PHENOMENEX® Luna 5u C18 21×250 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=34.1 min)