Synthese und Pharmakodynamische Aktivität von 2‐(3‐(2‐Phenylethyl)benzofuran‐2‐yl)‐N‐propyl‐ethanamin
- 1 January 1995
- journal article
- abstracts
- Published by Wiley in Archiv der Pharmazie
- Vol. 328 (4) , 343-348
- https://doi.org/10.1002/ardp.19953280410
Abstract
Im Rahmen von Struktur‐Wirkungs‐Untersuchungen an Klasse I‐Antiarrhythmika wurden die Benzofuranethanamine 3a und 3b synthetisiert, und 3a wurde pharmakologisch geprüft. Schlüsselschritt der Synthese war die chemoselektive Reduktion des Chloracetyl‐Dihydrobenzofurans 5 zum Chlorethylbenzofuran 9 mit Triethylsilan/BF3 · Et2O. Die Ergebnisse einer Reihe weiterer Reduktionsversuche von 5 werden ebenfalls beschrieben. Pharmakologische Untersuchungen an isolierten Präparaten von Meerschweinchenherzen zeigten, daß 3a eine ähnliche negativ inotrope und chronotrope Wirkung wie Propafenon und das entsprechend rigidisierte Benzofuran 1a besitzt. Im Unterschied zu diesen Substanzen zeigte 3a jedoch keine β1‐Adrenozeptoren‐blockierende Aktivität. Synthesis and Pharmacodynamic Activity of 2‐(3‐(2‐Phenylethyl)benzofuran‐2‐yl)‐N‐propyl‐ethanamine The benzofuranethanamines 3a and 3b were synthesized and pharmacologically tested to investigate structure‐activity relationships with antiarrhythmic compounds. The key‐step in the synthesis was the chemoselective reduction of the chloroacetyl‐dihydrobenzofurane 5 to chloroethylbenzofurane 9 using triethylsilane/BF3 • Et2O. Results of a series of further attempts to reduce 5 are also described. Pharmacological investigations on isolated guinea pig heart muscle preparations showed that 3a exhibits similar negative inotropic and negative chronotropic action in comparison to propafenone and the conformationally restricted benzofurane 1a. In contrast to these substances, however, 3a shows no β1‐adrenozeptor blocking activity.Keywords
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