Optimized Synthesis of Etidronate

Title:Optimized Synthesis of Etidronate

Volume: 10 Issue: 8

Author(s): Rita Kovacs, David Illes Nagy, Alajos Grün, Gyorgy Tibor Balogh, Sandor Garadnay, Istvan Greiner and Gyorgy Keglevich

Affiliation:

Keywords: Hydroxy-methylenebisphosphonic acid, Etidronate, Optimization, Intermediate.

Abstract: The synthesis of Etidronate (as the disodium salt) by the reaction of acetic acid with phosphorus trichloride/ phosphorus acid in methanesulfonic acid was studied and optimized. We showed that it is enough to use 3.2 equivalents of the phosphorus trichloride and there is no need to apply phosphorus acid. In the two-step variation of the synthesis, the acetyl chloride was formed by the reaction of acetic acid with phosphorus trichloride, thionyl chloride or triphosgene, then the intermediate was converted to etidronate by reaction with 2.2 equivalents of phosphorus trichloride. The work-up included in all cases hydrolysis and pH adjustment.

Cite this article as:

Kovacs Rita, Nagy Illes David, Grün Alajos, Balogh Tibor Gyorgy, Garadnay Sandor, Greiner Istvan and Keglevich Gyorgy, Optimized Synthesis of Etidronate, Letters in Drug Design & Discovery 2013; 10 (8) . https://dx.doi.org/10.2174/15701808113109990026