[NH2:1][C:2]1[C:7]([F:8])=[CH:6][N:5]=[C:4](Cl)[N:3]=1.[C:10](=[N:18][OH:19])([C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)[CH3:11].[H-].[Na+].O>CN(C=O)C.C(Cl)Cl>[NH2:1][C:2]1[C:7]([F:8])=[CH:6][N:5]=[C:4]([O:19][N:18]=[C:10]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH3:11])[N:3]=1
To a magnetically stirred mixture of 4-amino-2-chloro-5-fluoropyrimidine (0.10 g, 0.68 mmol) and acetophenone oxime (0.092 g, 0.68 mmol) in dry DMF (3 mL) in a 5 mL Biotage Iniator microwave vessel was added NaH (0.027 g of a 60 wt. % suspension, 0.68 mmol) under a N2 atmosphere. After gas evolution ceased, the resulting mixture was sealed with a Biotage Initiator microwave septa cap and heated to 100° C. in a Biotage Initiator microwave for 60 min. The contents were poured into a vial with water (5 mL) and CH2Cl2 (5 mL), and neutralized with a few drops of 2NHCl. The phases were separated and the organic extract was dried over MgSO4, filtered, and evaporated under a stream of nitrogen. The crude contents were purified on silica (EtOAc/hexanes gradient) and evaporation of the product fractions gave 0.057 g (34%) of 1-Phenyl-ethanone-O-(4-amino-5-fluoro-pyrimidin-2-yl)oxime as an off-white solid: mp 163-165° C.; 1H NMR (300 MHz, CDCl3) δ 8.04 (d, J=2.6 Hz, 1H), 7.75 (m, 2H), 7.42 (m, 3H), 5.25 (bs, 2H), 2.51 (s, 3H); HPLC-MS (ESI) m/z 247 (M+H)+.
Wird geladen…
