反应详情

A mixture of 1 mmol 2-hydroxy-5-methanesulfonyl-benzoic acid benzyl ester, 1.5 mmol of N-methylmorpholine and 0.2 mmol of 4-dimethylaminopyridine in 4 ml of dimethylformamide was treated with 1.3 mmol of N,N-dimethyl-carbamoylchloride. The reaction mixture was stirred at 60° for 48 hours, concentrated in vacuo and the residue taken up in 5 ml of water. Acidification with diluted hydrochloric acid and extraction with ethyl acetate yielded a crude product which was purified by chromatography (SiO2; ethyl acetate/cyclohexane 1.1). MS (m/e): 378.3 (MH+, 100%)

1. concentrationconcentrated in vacuo
2. extractionAcidification with diluted hydrochloric acid and extraction with ethyl acetate