×

Fenfluramine compositions and methods of preparing the same

  • US 10,351,509 B2
  • Filed: 12/20/2016
  • Issued: 07/16/2019
  • Est. Priority Date: 12/22/2015
  • Status: Active Grant
First Claim
Patent Images

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 to produce a purified 2-(3-(trifluoromethyl)phenyl)acetic acid composition;

    (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;

    (d) purifying the 1-(3-(trifluoromethyl)phenyl)propan-2-one composition via a ketone bisulfite adduct to produce a purified 1-(3-(trifluoromethyl)phenyl)propan-2-one composition; and

    (e) reductively aminating the purified 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 all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×