Substituted thieno[2,3‐b][1,4]benzoxazepine derivatives as well as thieno[3,2‐b][1,4]benzoxazepine deriva‐ tives have been synthesized. They are thienoanalogues of loxapine, a potent antipsychotic drug. Research activities concentrate on the preparation of structurally modified compounds of loxapine to minimize its undesirable extrapyramidal symptoms.
Nach Versuchen mit verschiedenen Losungsmitteln envies sich Wasser fur die Durchfuhrung der Reaktion am geeignetsten. Eine Verbesserung wurde auch durch die Venvendung von Na2S . 9 H 2 0 anstelle von NaHS erreicht. Durch Arbeiten unter Inertgas gelang es, die Disulfidbildung ausreichend zu minimieren.Die Reindarstellung des 2-Nitro-3-thiophenthiols (6) scheiterte allerdings an seiner Oxidationsempfindlichkeit. Aus diesem Grund muSte die Aufarbeitung des Ansatzes fur weitere Umsetzungen rnit dem Anisylglycidester 7 rasch erfolgen.Bei der Umsetzung von 6 rnit racemischen truns-3-(4-Methoxypheny1)glycidsaure-methylester (7) ist die stereoselektive Offnung des Epoxidringes der entscheidende Schritt in der Synthese des cisThienothiazepins 1. Die fur einen Angriff von Nitrothiophenol auf den Glycidester gefundenen Reaktionsbedingungen wurden auf das Thiophenanaloge ubertragen. Bei der Umsetzung unter Basenkatalyse wurde durch Offnung des Oxiranringes das racemische erythroProdukt 8 erhalten. Der bei Nitrothiophenolen beschriebene regio-
KT-362 is an antiarrhythmic and antihypertensive agent with vasodilating activity. Since it carries a homoveratryl group in the side chain, an obvious relation exists to the verapamil-type calcium antagonists. Replacement of the fused aromatic moiety in KT-362 with thiophene provided 8-[N-[2-(3,4-dimethoxyphenyl) ethyl]-beta-alanyl]-5,6,7,8-tetrahydrothieno[3,2-b][1,4] thiazepine (1). Compound 1 shows a negative chronotropic activity in spontaneously beating right atria (IC50 = 23 microM, n = 7), and a negative inotropic effect in papillary muscles (IC50 = 2.7 microM, n = 7) and left atria (IC50 = 4 microM, n = 6) of the guinea-pig heart. The decrease of contractility in papillary muscles could be antagonized by increasing the extracellular calcium concentration. Compound 1 was found to affect high (IC50: 70 +/- 5 microM) and low (IC50: 129 +/- 34 microM) voltage-activated calcium channel currents as well as voltage-activated sodium channel currents (IC50: 80 +/- 13 microM) in chick dorsal root ganglion neurons. In addition nicotine-induced currents were potently inhibited (IC50: 6 +/- 0.7 microM) in bovine chromaffin cells.
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