Dimethylamine → 2-[(Dimethylamino)sulfonylmethyl]benzoic acid

Participants

Reaction Steps

Liquified dimethylamine (73 ml) was added slowly with cooling to a 15% (w/w) solution of methyl 2-[(chlorosulfonyl)methyl]benzoate (42.0 g) in chlorobenzene. When addition was complete, the suspension was stirred 0.5 hour at room temperature, then filtered. The filtrate was concentrated to approximately 250 ml and added dropwise to a mixture of 150 ml of ethanol, 50 ml of water and 40 ml of 50% sodium hydroxide. The resulting suspension was stirred overnight at room temperature. The reaction solution was concentrated to dryness and the residue partitioned between 1000 ml water and 1000 ml of methylene chloride for 1.5 hour. The aqueous phase was separated, washed with 400 ml of methylene chloride, then acidified with concentrated hydrochloric acid. The precipitated solid was collected and dried overnight in vacuo to give 34.9 of 2-[(dimethylamino)sulfonylmethyl]benzoic acid, m.p. 112°-129°.

Provenance & Evidence