[Cl:1][C:2]1[N:7]=[C:6]([CH3:8])[C:5]([NH:9][C:10](=[O:12])[CH3:11])=[CH:4][N:3]=1.C([O-])(=O)C.[K+].C(OC(=O)C)(=O)C.[N:25](OCCC(C)C)=O>C(Cl)(Cl)Cl>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[N:9]([C:10](=[O:12])[CH3:11])[N:25]=[CH:8][C:6]=2[N:7]=1
A solution of N-(2-chloro-4-methylpyrimidin-5-yl)acetamide (9 g, 46.06 mmol, 1.00 equiv, 95%), potassium acetate (3.3 g, 32.95 mmol, 0.72 equiv, 98%), acetic anhydride (17.27 g, 165.78 mmol, 3.60 equiv) and isoamyl nitrite (13.6 g, 116.24 mmol, 2.52 equiv, 98%) in chloroform (180 mL) was reflux overnight. The resulting mixture was washed with water, dried over anhydrous sodium sulfate and concentrated under vacuum to give 7 g (73%) of 1-[5-chloro-1H-pyrazolo[4,3-d]pyrimidin-1-yl]ethan-1-one as a white solid.
Wird geladen…
