Optimized Synthesis of Etidronate

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

Journal Name: Letters in Drug Design & Discovery

Volume 10 , Issue 8 , 2013

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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.

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

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Article Details

Year: 2013
Published on: 31 July, 2013
Page: [733 - 737]
Pages: 5
DOI: 10.2174/15701808113109990026

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