Methyl acetoacetate → Methyl 2-(thien-2-yl)-4-(2-chloro-4-fluorophenyl)-6-methyl-1,4-dihyropyrimidin-5-carboxylate

Participants

Reaction Steps

2.164 mmol of 2-thienylformamidine hydrochloride (Schaefer F. C., Peters G. A., et al, J. Org. Chem.; 1961, 26(2): 412-418), 2.164 mmol of 2-chloro-4-fluorobenzaldehyde, 2.164 mmol of methyl acetoacetate and 2.2 mmol of sodium acetate in 10 ml of anhydrous ethanol was reacted under reflux for 20 hours and concentrated. Ethyl acetate and water were added to the reaction, and the phases were separated. The ethyl acetate layer was dried over anhydrous sodium sulfate and separated by a column chromatography to give 0.22 g of a yellow crystal (yield: 30%); 1H-NMR (400 MHz, CDCl3) δ 2.55 (3H, s, CH3); 3.62 (3H, s, CH3); 6.00 (1H, s, CH); 6.89-6.94 (1H, m, ArH); 7.03-7.05 (1H, dd, J1=4.80 Hz, J2=3.60 Hz, ArH); 7.11-7.14 (1H, m, ArH); 7.26-7.30 (1H, m, ArH); 7.33-7.34 (1H, d, J2=3.60 Hz, ArH); 7.44-7.45 (1H, d, J1=4.80 Hz ArH); MS (HREI) 344.0448 (M+).

Provenance & Evidence