The invention discloses a preparation method of a sivelestat
sodium hydrate intermediate, comprising the following steps: successively pouring
acyl chloride, a nonpolar
organic solvent, an alkaline acid-binding agent,
glycine methyl
ester hydrochloride and an
amide-type catalyst into a reaction vessel to react, pouring reaction products into dilute
hydrochloric acid, standing and removing an
organic layer, adjusting pH value of a
water layer to neutral with diluted alkali, filtering,
drying, recrystalizing,
drying to obtain N-benzoyloxycarbonylmethyl-2-aminobenzamideglycine, successively pouring N-benzoyloxycarbonylmethyl-2-aminobenzamideglycine, 4-pivaloyloxybenzenesulfonyl choride, the nonpolar
organic solvent, the alkaline acid-binding agent and the
amide-type catalyst into the reaction vessel to react, and pouring reaction products into dilute
hydrochloric acid to react so as to obtain the sivelestat
sodium hydrate intermediate. By the preparation method of the sivelestat
sodium hydrate intermediate, synthetic process
route is greatly shortened. The preparation method is easy to operate;
reaction conditions are mild; and industrial production
safety coefficient is raised.