反应详情

A solution of 4-butyl-1-(methylsulfonyl)-1,2,3,4-tetrahydroquinoxaline-6-carboxylic acid (99 mg), HATU (181 mg), HOBt (64 mg), and diisopropylethylamine (100 μL) was stirred in methylene chloride (1.0 mL) for 15 min. A solution of (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-[(3-ethylbenzyl)amino]butan-2-ol (129 mg) and diisopropylethylamine (100 μL) in methylene chloride (1.0 mL) was added and the mixture was stirred overnight. The mixture was diluted with methylene chloride, washed with 1 N hydrochloric acid (10 mL), saturated sodium bicarbonate (10 mL), and brine. The organic layer was then dried (magnesium sulfate), filtered, and concentrated under reduced pressure. Purification by flash column chromatography (silica, 1:9 methanol/chloroform) provided a clear solid. The solid was dissolved in methanol (1 mL), and treated with hydrochloric acid (0.5 mL, 1.0 M diethyl ether). The resulting precipitate was collected by filtration to provide 90 mg of the title compound: ESI MS m/z 629 [M+H]+.

1. washwashed with 1 N hydrochloric acid (10 mL), saturated sodium bicarbonate (10 mL), and brine
2. dry with materialThe organic layer was then dried (magnesium sulfate)
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customPurification by flash column chromatography (silica, 1:9 methanol/chloroform)
6. customprovided a clear solid
7. filtrationThe resulting precipitate was collected by filtration