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Novel process for making bisphosphonic acids using diluents other than halogenated hydrocarbons

a technology of halogenated hydrocarbons and bisphosphonic acids, which is applied in the field of making bisphosphonic acids, can solve the problems of inability to commercialize, inefficient use on a large scale, and safety problems that surfa

Inactive Publication Date: 2006-06-15
LIDOR HADAS RAMI +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process might be suitable for laboratory preparation of gram quantities of the product however, for commercial production it is not acceptable.
Although the problems with physical characteristics of the reaction appeared solved, a safety problem surfaced.
However, it was reported that large quantities of polyalkylene(glycol), as well as toluene, are required for the reaction, making it inefficient for use on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] A 250 ml cylindrical reactor equipped with a mechanical stirrer, a thermometer, a reflux condenser and a dropping funnel, was charged with 3-pyridine acetic acid hydrochloride (6.94 g, 0.04 mole), phosphorous acid (9.84 g, 0.12 mole) and toluene (50 ml). The suspension was heated to 85° C. and phosphorous oxychloride (11.2 ml, 0.12 mole) was added dropwise during 20 minutes. The reaction mixture was then heated to 95° C. for 2.5 hours. Water (50 ml) was added after cooling the reaction mixture to 65° C. The mixture was stirred vigorously until the solidified product dissolved completely. The toluene and the aqueous phases were separated and the aqueous phase was heated at 95° C. for 16 hours. Then aqueous phase it was cooled to 25° C. and absolute ethanol (100 ml) was added to precipitate the final product. The suspension was cooled to 5° C. and held at that temperature for 1 hour. The white product was filtered, washed with absolute ethanol (2×50 ml) and dried in a vacuum ov...

example 2

[0103] A 250 ml cylindrical reactor equipped with a mechanical stirrer, a thermometer, a reflux condenser and a dropping funnel, was charged with 3-pyridine acetic acid hydrochloride (6.94 g, 0.04 mole), phosphorous acid (9.84 g, 0.12 mole) and silicon oil (Aldrich) (50 ml). The suspension was heated to 85° C. and phosphorous oxychloride (11.2 ml, 0.12 mole) was added dropwise during 45 minutes. The reaction mixture was then heated to 95° C. for 25 hours. Then another amount of phosphorous oxychloride (3.73 ml, 0.04 mole) was added dropwise and the reaction mixture was heated for an additional 5 hours at 95° C. Water (50 ml) and toluene (50 ml) were added after cooling the reaction mixture to 65° C. The mixture was stirred vigorously for 30 minutes. Then the toluene phase (containing the silicon oil) and the aqueous phases were separated and the aqueous phase was heated at 95° C. for 16 hours. Then the aqueous phase was cooled to 5° C. and was stirred at this temperature for 5.5 hou...

example 3

[0104] A 250 ml cylindrical reactor equipped with a mechanical stirrer, a thermometer, a reflux condenser and a dropping funnel, was loaded with 3-Pyridine acetic acid hydrochloride (6.94 g, 0.04 mole), phosphorous acid (9.84 g, 0.12 mole) and silicon oil (silicon fluid M-350) (50 ml). The suspension was heated to 85° C. and phosphorous oxychloride (11.2 ml, 0.12 mole) was added dropwise during 30 minutes. The reaction mixture was then heated to 95° C.-100° C. After 4 hours at 95° C.-100° C., another amount of phosphorous oxychloride (3.73 ml, 0.04 mole) and phosphorous acid (3.28 g, 0.04 mole) was added and the reaction mixture was heated at 95° C.-100° C. for additional 17 hours. Water (50 ml) and toluene (50 ml) were added after cooling the reaction mixture to 65° C. The mixture was stirred vigorously for 10 minutes. Then the toluene phase (containing the silicon oil) and the aqueous phase were separated and the aqueous phase was heated at 95° C. for 18 hours. Then it was cooled ...

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Abstract

Provided is a novel method of making bisphosphonic acids, e.g. risedronic acid, including the step of combining a carboxylic acid, phoshorous acid, and a halophosphorous compound in the presence of a diluent that is an aromatic hydrocarbon or a silicone fluid. When the diluent is an aromatic hydrocarbon, a inert support or ortho-phosphoric acid codiluent is advantageously included.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a divisional of U.S. Ser. No. 10 / 442,001, filed May 19, 2003, which claims the benefit of U.S. Provisional Application Ser. No. 60 / 381,284, filed May 17, 2002, Ser. No. 60 / 401,313, filed Aug. 6, 2002, Ser. No. 60 / 423,337, filed Nov. 1, 2002, Ser. No. 60 / 431,838, filed Dec. 9, 2002, Ser. No. 60 / 450,193, filed Feb. 25, 2003 and Ser. No. 60 / 470,473, filed Jul. 13, 2003.FIELD OF THE INVENTION [0002] The present invention relates to a method of making bisphosphonic acids, salts of which are useful in the treatment of bone disorders. BACKGROUND OF THE INVENTION [0003] The bisphosponates, which are salts of bisphosphonic acids, are an important class of medicaments useful in the treatment of bone disorders such as Paget's disease and osteoporosis. See, e.g., Robert Marcus, Agents Affecting Calcification and Bone Turnover, in Goodman and Gilman's The Pharmacological Basis of Therapeutics 1519, 1537-39 (Joel G. Hardman & Lee E...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07F9/28C07F9/38C07F9/58C07F9/6506C07F9/6561
CPCC07F9/3873C07F9/582C07F9/65061C07F9/6561C07F9/58C07F9/6506C07F9/38
Inventor LIDOR-HADAS, RAMIHAREL, ZVILIFSHITZ-LIRON, REVITALKOVALEVSKI-ISHAI, ETI
Owner LIDOR HADAS RAMI
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