反应详情

To a solution of (1R,3S)-ethyl 3-aminocyclohexanecarboxylate, 18, (5.1 g, 24.1 mmol) and 2,4-dichloro-5-fluoropyrimidine (6.0 g, 36.0 mmol) in THF (60 mL) was added diisopropylethylamine (9.6 mL, 55.4 mmol). The mixture was heated to reflux overnight. The reaction was cooled to room temperature and concentrated in vacuo. The residue was diluted with water and extracted twice with ethyl acetate. The combined organic phases were dried (MgSO4), filtered and concentrated in vacuo. The residue was purified by silica gel chromatography (0-40% EtOAc/hexanes gradient) to provide 6.7 g of (1R,3S)-ethyl 3-(2-chloro-5-fluoropyrimidin-4-ylamino)cyclohexane-carboxylate as a white solid: LCMS RT=3.1 (M+H) 302.2.

1. temperatureThe mixture was heated
2. temperatureto reflux overnight
3. concentrationconcentrated in vacuo
4. additionThe residue was diluted with water
5. extractionextracted twice with ethyl acetate
6. dry with materialThe combined organic phases were dried (MgSO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by silica gel chromatography (0-40% EtOAc/hexanes gradient)