反应详情

Isopropyl 3-(2-(3-(2,6-dichlorophenyl)isoxazol-5-yl)pyridin-4-ylamino)propanoate (520 mg, 1.23 mmol) was dissolved in anhydrous dichloromethane (25 mL) with triethylamine (270 mg, 2.7 mmol). The mixture was cooled in an ice-bath under nitrogen, then a solution of dichloroacetyl chloride (320 mg, 2.17 mmol) was added dropwise. After the addition was completed the ice-bath was removed and the mixture was stirred at room temperature overnight. The reaction mixture was diluted with dichloromethane and then washed successively with water, 10% hydrochloric acid and saturated sodium bicarbonate solution. The organic solution was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography, on silica gel, eluting with 95:5 hexanes:ethyl acetate to yield isopropyl 3-(2,2-dichloro-N-(2-(3-(2,6-dichlorophenyl)isoxazol-5-yl)pyridin-4-yl)acetamido)propanoate (Cpd. No. 57). 1H NMR (CDCl3): 8.38 (m, 1H), 8.01 (s, 1H), 7.80 (m, 1H), 7.50-7.41 (m, 4H), 7.18 (s, 1H), 6.86 (s, 1H), 6.32 (s, 2H), 5.08 (m, 1H), 1.38 ppm (s, 6H).

1. temperatureThe mixture was cooled in an ice-bath under nitrogen
2. additionAfter the addition
3. customwas removed
4. additionThe reaction mixture was diluted with dichloromethane
5. washwashed successively with water, 10% hydrochloric acid and saturated sodium bicarbonate solution
6. dry with materialThe organic solution was dried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe resulting residue was purified by flash column chromatography, on silica gel
10. washeluting with 95:5 hexanes