3-CHLORO-N-(2-FLUOROPHENYL)PROPANAMIDE synthesis

Yield:349097-66-1 97%

Reaction Conditions:

with pyridine in acetone at 20; for 0.5 h;

Steps:

41

Example 41 3-Chloro-N-(2-fluorophenyl)propanamide (3) 2-Fluoroaniline (2 g, 17.99 mmol) was stirred in acetone (30 mL) and pyridine (2.91 mL, 35.99 mmol) and allowed to dissolve. To this solution was added 3-chloropropanoyl chloride (3.42 g, 26.99 mmol), slowly. The reaction mixture began to reflux, and when the mixture had cooled to room temperature (~30 min) TLC analysis showed that the reaction was complete. The reaction mixture was then diluted with water and HCl_(aq) (1N) and extracted with dichloromethane (3*). The combined organic extracts were dried over sodium sulfate, filtered and concentrated, then chromatographed on silica gel in 30% EtOAc in hexanes. Yield: 3.5 g, 97%. ¹H NMR (CDCl₃) δ 2.87 (t, 2H, J=6.7 Hz), 3.89 (t, 2H, J=6.7 Hz), 7.10 (m, 3H), 7.52 (brs, 1H), 8.30 (t, 1H, J=7.5 Hz). EI-MS (m/z, %): 201.1 (M+, 22), 111.1 (100).

References:

US2008/234237,2008,A1 Location in patent:Page/Page column 74