反应详情

A solution of 3-[(dipropylamino)carbonyl]-5-(4-methyl-1,3-oxazol-2-yl)benzoic acid (77.5 mg, 0.23 mmol), (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-[(3-ethylbenzyl)amino]butan-2-ol dihydrochloride (96 mg, 0.23 mmol), HOBt (32 mg, 0.23 mmol), and N-methylmorpholine (83 μL, 0.75 mmol) was stirred in dimethylformamide (2 mL) for 15 min. EDC (73 mg, 0.42 mmol) was added and the reaction mixture was stirred overnight. The reaction mixture was diluted with water, and extracted with ethyl acetate (3×25 mL) The organic layer was washed with 1 N hydrochloric acid (25 mL), saturated sodium bicarbonate (25 mL), saturated sodium chloride, dried (sodium sulfate), and concentrated under reduced pressure. Purification by flash column chromatography (silica, 1:9 methanol/chloroform) provided N1-{(1S,2R)-1-(3,5-difluorobenzyl)-3-[(3-ethylbenzyl)amino]-2-hydroxypropyl}-5-(4-methyl-1,3-oxazol-2-yl)-N3,N3-dipropylisophthalamide (40 mg): 1H NMR (300 MHz, CDCl3) δ 8.20 (br s, 1H, —NH), 8.17 (s, 1H), 8.05 (s, 1H), 7.52 (s, 1H), 7.38 (s, 1H), 7.24-7.08 (m, 5H), 7.02 (d, J=8 Hz, 2H), 6.61 (t, J=8 Hz, 1H), 4.27 (br s, 1H), 3.93 (d, J=4 Hz, 1H), 3.85 (s, 2H), 3.54 (br s, 2H), 3.43 (br s, 2H), 2.84 (d, J=5 Hz, 2H), 2.63 (q, J=8 Hz, 2H), 2.18 (s, 3H), 1.74 (t, J=5 Hz, 2H), 1.41 (d, J=7 Hz, 2H), 1.22 (t, J=8 Hz, 3H), 1.03 (t, J=7 Hz, 3H), 0.64 (t, J=7 Hz, 3H); ESI MS m/z 647 [M+H]+

1. extractionextracted with ethyl acetate (3×25 mL) The organic layer
2. washwas washed with 1 N hydrochloric acid (25 mL), saturated sodium bicarbonate (25 mL), saturated sodium chloride
3. dry with materialdried (sodium sulfate)
4. concentrationconcentrated under reduced pressure
5. customPurification by flash column chromatography (silica, 1:9 methanol/chloroform)