4-Chloro-3-[(carboxymethyl)sulfonyl]benzoic acid methyl ester → Methyl 4-chloro-3-(methylsulfonyl)benzoate

Participants

Reaction Steps

4-Chloro-3-[(carboxymethyl)sulfonyl]benzoic acid methyl ester (5.6 g) was mixed with pyridine (10 mL) and the mixture was refluxed for 30 min and then cooled to room temperature. The product was precipitated by adding water (30 mL). The precipitate was filtered, washed with water and dried (yield 2.5 g). 1H-NMR (400 MHz, DMSO-d6) d=3.43 (s, 3H), 3.92 (s, 3H), 7.92 (d, J=8.2 Hz, 1H), 8.24 (dd, J=8.2 Hz, 2.2 Hz, 1H), 8.53 (d, J=2.2 Hz, 1H).

Provenance & Evidence