Diisopropylethylamine → Methyl 2-(4-fluorophenyl)-4,5-dihydrooxazole-4-carboxylate

Participants

Reaction Steps

N,N-diisopropylethylamine (11 mL, 63.3 mmol) was added dropwise to a solution of methyl 4-fluorobenzimidate hydrochloride (10 g, 52.74 mmol) and DL-serine methyl ester HCl salt (9.9 g, 63.63 mmol) in dry CH2Cl2 (200 mL) at 0° C. The reaction mixture was stirred at room temperature for 24 h and then concentrated under reduced pressure. The reaction mixture was diluted with CH2Cl2 and the organic layer was washed with H2O and brine, dried over anhydrous Na2SO4, and concentrated under reduced pressure to get methyl 2-(4-fluorophenyl)-4,5-dihydrooxazole-4-carboxylate (9.5 g, yield 81%) as an orange liquid. 1H NMR (300 MHz, CDCl3) δ 8.02-7.97 (m, 2H), 7.13-7.07 (t, J=8.7 Hz, 2H), 4.98-4.92 (m, 1H), 4.73-4.57 (m, 2H), 3.83 (s, 3H). MS (ESI) m/z: Calculated for C11H10FNO3: 223.06. found: 223.8 (M+H)+

Provenance & Evidence