Fenfluramine compositions and methods of preparing the same
DCFirst Claim
1. A method of preparing a fenfluramine active pharmaceutical ingredient, the method comprising:
- (a) hydrolyzing a 2-(3-(trifluoromethyl)phenyl)acetonitrile composition to produce a 2-(3-(trifluoromethyl)phenyl)acetic acid composition;
(b) purifying the 2-(3-(trifluoromethyl)phenyl)acetic acid composition via crystallization to produce a purified 2-(3-(trifluoromethyl)phenyl)acetic acid having less than 0.2% by weight in total of trifluoromethyl-phenyl regioisomers;
(c) reacting the purified 2-(3-(trifluoromethyl)phenyl)acetic acid composition with acetic anhydride and a catalyst to produce a 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and
(d) reductively aminating the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition with ethylamine using a borohydride reducing agent to produce a crude fenfluramine composition having less than 0.2% by weight in total of trifluoromethyl-phenyl regioisomers of fenfluramine or a salt thereof.
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Abstract
Methods of preparing a fenfluramine active pharmaceutical ingredient are provided. Aspects of the method include (a) hydrolyzing a 2-(3-(trifluoromethyl)phenyl)acetonitrile composition to produce a 2-(3-(trifluoromethyl)phenyl)acetic acid composition; (b) reacting the 2-(3-(trifluoromethyl)phenyl)acetic acid composition with acetic anhydride and a catalyst to produce a 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and (c) reductively aminating the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition with ethylamine using a borohydride reducing agent to produce a fenfluramine composition. Also provided are compositions and pharmaceutical ingredients prepared according to the subject methods including a pharmaceutically acceptable salt of fenfluramine and having less than 0.2% by weight in total of trifluoromethyl regioisomers.
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Citations
18 Claims
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1. A method of preparing a fenfluramine active pharmaceutical ingredient, the method comprising:
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(a) hydrolyzing a 2-(3-(trifluoromethyl)phenyl)acetonitrile composition to produce a 2-(3-(trifluoromethyl)phenyl)acetic acid composition; (b) purifying the 2-(3-(trifluoromethyl)phenyl)acetic acid composition via crystallization to produce a purified 2-(3-(trifluoromethyl)phenyl)acetic acid having less than 0.2% by weight in total of trifluoromethyl-phenyl regioisomers; (c) reacting the purified 2-(3-(trifluoromethyl)phenyl)acetic acid composition with acetic anhydride and a catalyst to produce a 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and (d) reductively aminating the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition with ethylamine using a borohydride reducing agent to produce a crude fenfluramine composition having less than 0.2% by weight in total of trifluoromethyl-phenyl regioisomers of fenfluramine or a salt thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification