200801-70-3Relevant articles and documents
Photochemistry of a novel antimuscarinic drug fesoterodine and identification of its photodegradation products by LC-ESI-MS studies
Sangoi, Maximiliano S.,Todeschini, Vítor,Goelzer, Gustavo K.,Steppe, Martin
, p. 16 - 22 (2013)
Fesoterodine (FESO) is a novel muscarinic receptor antagonist for the treatment of overactive bladder syndrome. The aim of this work was to study the photodegradation of FESO, to determine its kinetics and to identify the photodegradation products. The photochemistry of FESO was investigated in sample solutions exposed to a UV-A (320-400 nm) and UV-C irradiation (100-280 nm) at room temperature. The photodegradation process was monitored by means of liquid chromatography method equipped with monolithic column and photodiode array detector. This drug is more photolabile under UV-C light. In methanol-water solution (1:1, v/v), approximately 62.5% of FESO decomposes after 60 min of UV-C irradiation, whereas under 6 h of UV-A light only 4.9% decomposes. FESO was shown to be photolabile and its photodegradation reaction followed the zero-order kinetics with the rate constant k = 0.5503 min-1, and t1/2 and t90% obtained were 46.92 min and 9.38 min, respectively. The main degradation products were isolated by semi-preparative liquid chromatography and identified by liquid chromatography coupled to an electrospray ionization mass spectrometry. The powdered and intact tablets were also exposed to UV-C irradiation. Based on the obtained results, a complete drug photodegradation pathway was proposed.
Formal synthesis of fesoterodine by acid-facilitated aromatic alkylation
Lee, Youngeun,Shabbir, Saira,Jeong, Yuri,Ban, Jaeyoung,Rhee, Hakjune
, p. 2885 - 2889 (2016/02/05)
The competitive muscarinic receptor antagonist fesoterodine is a congener of tolterodine and has better efficiency compared to tolterodine. In this study, we present an efficient synthesis of the fesoterodine intermediate 3-(3-diisopropylamino-1-phenylpropyl)-4-hydroxybenzaldehyde from ethyl benzoylacetate by Friedel-Crafts alkylation in the presence of an acid as a key reaction step. The synthesis is carried out by the reduction of the ketoester to a 1,3-diol, diisopropylamine substitution, and Friedel-Crafts alkylation, followed by reduction and chiral resolution.
The lactol route to fesoterodine: An amine-promoted Friedel-Crafts alkylation on commercial scale
Dirat, Olivier,Bibb, Andrew J.,Burns, Colin M.,Checksfield, Graham D.,Dillon, Barry R.,Field, Stuart E.,Fussell, Steven J.,Green, Stuart P.,Mason, Clive,Mathew, Jinu,Mathew, Suju,Moses, Ian B.,Nikiforov, Petar I.,Pettman, Alan J.,Susanne, Flavien
, p. 1010 - 1017 (2011/12/16)
We report the discovery and optimization of an amine-promoted Friedel-Crafts alkylation of cinnamaldehyde with 4-hydroxymethyl phenol. This reaction has been used successfully on commercial scale (200 kg) in the context of the manufacture of fesoterodine, a muscarinic antagonist used for the treatment of overactive bladder. Reductive aminations of diisopropylamine and lactol 4 are also discussed, as well as the resolution of the racemic amine rac-2 into its enantiomerically pure form.