反应详情

To a solution of 3-(4-(3-fluoroazetidin-3-yl)phenyl)-5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazole (Preparation 9, 94 mg) in 2 mL CH2Cl2 was added pyridine (0.05 mL) followed by acetyl chloride (31 mg). The reaction was allowed to stir at room temperature for 1 hour. Water (3 mL) was added. The reaction was diluted with 3 mL of CH2Cl2, stirred for 30 minutes and poured through a phase extractor. The CH2Cl2 layer was collected and concentrated. The crude product from the reaction was adsorbed onto silica and chromatographed on a 12 g silica column eluting with a gradient of 50% EtOAc/hexanes to 100% EtOAc/hexanes to yield 90 mg of the desired compound as a white foam. 1H NMR (CDCl3) δ 7.76 (d, 2H). 7.67 (s, 2H), 7.56 (d, 2H), 4.71-4.31 (m, 4H), 4.12 (d, 1H), 3.72 (d, 1H), 2.01 (s, 3H). LC/MS retention time=3.591 minutes; MS calculated for (C21H15Cl3F4N2O2), 509.714; found 511 M+H.

1. stirringstirred for 30 minutes
2. additionpoured through a phase extractor
3. customThe CH2Cl2 layer was collected
4. concentrationconcentrated
5. customchromatographed on a 12 g silica column
6. washeluting with a gradient of 50% EtOAc/hexanes to 100% EtOAc/hexanes