Process for preparing 4-amino-1-hydroxy-butylidene-1,...

Details Process for preparing 4-amino-1-hydroxy-butylidene-1,... Process for preparing 4-amino-1-hydroxy-butylidene-1,...

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2044923

An improved process is described for the preparation of 4-amino-1-hydroxybutylidene-1,1- bisphosphonic acid (ABP)or salts thereof which comprises: (a) reacting 4-aminobutyric acid with a mixture of phosphorous acid and PC13 in the presence of methanesulfonic acid; (b) contacting the mixture from Step (a) with an aqueous hydrolysis mixture, wherein the pH is maintained in the range of 4 to 10 during the contacting; and (c) recovering said 4-amino-1-hydroxybutylidene- 1,1-bisphosphonic acid or salts thereof.

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