Die Erfindung betrifft ein neues Verfahren zur Herstellung von teilweise bekannten Methylketonen der Formel
in welcher R1, R2 und R3 die in der Beschreibung angegebene Bedeutung besitzen, wobei man Methyl-sek.-alkyl-ketone mit Halogeniden in Gegenwart einer Base und eines Verdünnungsmittels, sowie in Gegenwart eines Phasentransferkatalysators umsetzt. Die Verbindungen können als Zwischenprodukte zur Herstellung von Pflanzenschutzmitteln Verwendung finden.
We have proposed a multi-template approach for drug development, focusing on similar fold structures of proteins, and have effectively generated lead compounds for several drug targets. Modification of these polypharmacological lead compounds is then needed to generate target-selective compounds. In the work presented here, we aimed at separation of the anti-androgen activity and vitamin D activity of previously identified diphenylpentane lead compounds. Based on the determined X-ray crystal structures of androgen receptor and vitamin D receptor, bulky substituents were introduced at the t-butyl group in the lead compounds 2 and 3. As a result of this structural development, we obtained 16c, which exhibits more potent anti-androgen activity (IC(50): 0.13 mu M) than clinically used anti-androgen bicalutamide (IC(50): 0.67 mu M) with 30-fold selectivity over vitamin D activity. This result indicates that lead compounds obtained via the multi-template approach can indeed be structurally modified to generate target-selective compounds. (C) 2010 Elsevier Ltd. All rights reserved.