Dimethyl Sulfate → HCID 20505957, compound

Participants

Reaction Steps

2-Chloro-5-(3,4-dihydroxypiperidinosulfonyl)benzoic acid (4.0 g.) is heated for 16 hours at 90° C. with water (15 ml.), NaOH (1.0 g. and dimethyl sulfate (0.5 ml.). Dimethyl sulfate and NaOH are added during the course of the reaction to maintain basicity. After cooling to room temperature, the reaction mixture is washed with ether and the aqueous phase is acidified with concentrated hydrochloric acid and decanted from the precipitated gum. The gum is dissolved in ethyl acetate and chromatographed on a silica gel column. The product fractions in the column effluent are identified by paper chromatography, with development in a solvent system of ethyl acetate-acetic acid. Concentration of the column fraction yields the product, m.p. 170°-174° C.

Provenance & Evidence