4-Chlorobenzoyl chloride → 4-chloro-N-(thiophen-2-ylmethyl)benzamide

Participants

Reaction Steps

A solution of 4-chlorobenzoyl chloride (0.114 mol) in 50 mL dry CH2Cl2 was added over 30 min to a stirred solution of 2-aminomethyl-thiophene (0.137 mol) and iPr2NEt (0.25 mol) in CH2Cl2 (200 mL) at 0° C. A white solid was formed and the reaction was allowed to warm to room temperature over 1 h. The mixture was diluted with 200 mL of CH2Cl2, washed twice with HCl aq. (0.1N) and dried over MgSO4. Evaporation of the solvents afforded 28 g (98%) of the title benzamide (1a) as a white solid: m.p. 153-54° C., 1H NMR (CDCl3) δ 7.9 (d, J=8.67 Hz, 2H), 7.58 (d, J=8.67 Hz, 2H), 7.44 (dd, J=3.77, 1.13 Hz, 1H), 7.22 (d, J==5.27 Hz, 1H), 7.16 (dd, J=3.39, 5.27 Hz, 1H), 6.62 (br d, 1H), 4.98 (d, J=5.65 Hz, 2H).

Provenance & Evidence