Triethylamine → Methyl 4-chloro-3-[(4-chloro-1-oxobutyl)amino]benzoate

Participants

Reaction Steps

4-Chlorobutyryl chloride (2.82 g, 20 mmol, 2.0 equiv) in CH2Cl2 (5 ml) was added over 2 min to a stirred solution of 3-amino-4-chloro-benzoic acid methyl ester (D27c) (1.66 g, 10 mmol, 1 equiv) and NEt3 (2.22 g, 22 mmol, 2.2 equiv) in CH2Cl2 (40 ml). The resulting mixture was stirred for 1 h at room temperature then washed with 2N aqueous HCl solution, dried over MgSO4 and concentrated in vacuo. The residue was triturated with CH2Cl2 to give 4-chloro-3-(4-chloro-butanoylamino)-benzoic acid methyl ester (D28c) (1.81 g, 48%) as a pale pink solid.

Provenance & Evidence