A NEW AND IMPROVED PROCESS FOR THE PREPARATION OF IBANDRONATE SODIUM MONOHYDRATE

摘要

The present invention discloses a new and an improved process for preparation of Ibandronate sodium monohydrate. According to the process pentylamine is reacted with ethylacrylate to give N-pentyl-ß-alanine ethyl ester (XXIV), which on methylation provided N-methyl-N-pentyl-ß-alanine ethylester formula (XXV). The reresulting ester on hydrolysis and subsequent treatment with hydrochloric acid furnished 3-(N-methyl-N-pentylamino)propionic acid hydrochloride formula (II). Bisphosphorylation of 3-(N-methyl-N-pentylamino)propionic acid hydrochloride formula (II) with phosphorous acid and phosphorous trichloride followed by hydrolysis and subsequent treatment with a base provided Ibandronate monosodium monohydrate of formula (I).