MIBEFRADIL

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Warnung

• Gefahrenhinweise

  H302：Gesundheitsschädlich bei Verschlucken.

• Sicherheit

  P280：Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.

  P305+P351+P338：BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.

MIBEFRADIL Chemische Eigenschaften,Einsatz,Produktion Methoden

• Beschreibung

  Posicor was launched in Argentina, Azerbaijan, Brazil, the Chile, Czech Republic, Denmark, Germany, Ireland, Kazakhstan, the Netherlands, Norway, Peru, the Philippines, Switzerland, Thailand, Turkmenistan, the UK, the US and Venezuela for use in hypertension. It can be assembled in five steps from 4-(1-benzyloxy-Nmethylformamido) butyric acid with o-phenylenediamine and isobutylchloroformate. Posicor binds to calcium channels in a manner that overlaps the Verapamil, SR-33557 and Diltiazem binding site without effecting the dihydropyridine binding site. Thus it blocks a wide variety of calcium channels with selectivity for T-type followed sequentially by L-type. There is also some calcium agonist activity along with sodium and potassium channel activity. It is chemically distinct from the other calcium antagonists (first member of a new catagory of tetralol calcium antagonists). It has the ability to lower heart rate with no negative inotropic effects and is as effective as Amlodipine and more effective than Diltiazem for the treatment of mild to moderate hypertension. Serious drug interactions are possible because Posicor inhibits both CYP2D6 and CYP3A4.

• Originator

  Roche (Switzerland)

• Verwenden

  Vasodilator.

• Verwenden

  Mibefradil has been used as a T-type calcium channel blocker in various cells. It has also been used to reduce apoptosis of retinal ganglion cells (RGC) in EphB2-Fc.

• Manufacturing Process

  To the solution of 5.35 g (28 mmol) [3-(1H-benzimidazol-2- yl)propyl]methylamine in 12.5 mL toluene was added by syringe 12.5 mL (11.42 g, 114 mmol) isopropenyl acetate. The reaction mixture was heated to reflux temperature, and stirred at that temperature for 1.75 hours, with reaction completion monitored by thin-layer chromatography (silica gel, eluting with 70% ethyl acetate/30% methanol). The product, N-[3-(1Hbenzimidazol-2-yl)propyl]-N-methylacetamide, was obtained in quantitative yield.
  Under a dry nitrogen atmosphere, a 2.5 molar solution of butyl lithium in hexane, 8.4 mL (21 mmol) was added by syringe to 20 mL pentane. The solution was cooled to 0°C and 2.75 mL (2.13 g, 21 mmol) diisopropylamine was added by syringe over six min. The solution was warmed to 25°C and stirred for three hours, then volatiles were removed in vacuo. THF, 20 mL, was added via syringe to the residue, and the resulting yellow solution cooled to 0°C. A solution of 2.42 g (10.5 mmol) N-[3-(1H-benzimidazol-2-yl)propyl]- N-methylacetamide in 10 mL THF was added by syringe over 9 min. The yellow solution was stirred for 15 min, then cooled to -78°C. (S)-6-Fluoro-1- isopropyl-3,4-dihydro-1H-naphthalen-2-one, 2.166 g, 87.2% pure (97.6:2.4 S:R), in 2 mL toluene was added by syringe over 12 min, and a further 2 mL toluene was used to complete the transfer. After stirring for two hours, the viscous yellow mixture was added to 50 mL water at less than 10°C. The suspension that formed was extracted with diethyl ether; and the extracts were dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 3.74 g of impure (1S,2S)-N-[3-(1H-benzimidazol-2-yl)propyl]- 2-(6-fluoro-2-hydroxy-1-isopropyl-1,2,3,4-tetrahydronaphthalen-2-yl)-N-
  methylacetamide as a yellow foam. The foam was recrystallized from toluene, yield of a colorless solid 2.69 g, melting point 132-138°C. This material may be recrystallized a second time from toluene to remove residual (S)-6-fluoro- 1-isopropyl-3,4-dihydro-1H-naphthalen-2-one if necessary.
  (1S,2S)-N-[3-(1H-Benzimidazol-2-yl)propyl]-2-(6-fluoro-2-hydroxy-1- isopropyl-1,2,3,4-tetrahydronaphthalen-2-yl)-N-methylacetamidemay be synthesized by another method:
  To the mixture 22.7 g (0.54 mol) dry lithium chloride and 100 mL THF at - 15°C was added 160 mL 2 molar lithium diisopropylamide (0.32 mol) in heptane/THF/ethylbenzene was added. Then a solution of 36.6 g (0.16 mol) N-[3-(1H-benzimidazol-2-yl)-propyl]-N-methylacetamide in 140 mL toluene was added, the solution was stirred for 2 hours, and a further 155 mL toluene was added. (S)-6-Fluoro-1-isopropyl-3,4-dihydro-1H-naphthalen-2-one (29.9 g, 0.15 mol), in 15 mL toluene was added. After stirring at -10°C for 4 hours, the resulting solution was added to 200 mL ice water. The pH of the resulting mixture was adjusted to 7-8 by addition of a 71 g concentrated hydrochloric acid. The organic layer washed with water, then the solvents removed under reduced pressure to give 96 g of (1S,2S)-N-[3-(1H-benzimidazol-2-yl)propyl]- 2-(6-fluoro-2-hydroxy-1-isopropyl-1,2,3,4-tetrahydronaphthalen-2-yl)-Nmethylacetamide as a brown oil. The product was crystallysed from toluene, yield 45.3 g.
  (1S,2S)-N-[3-(1H-Benzimidazol-2-yl)propyl]-2-(6-fluoro-2-hydroxy-1- isopropyl-1,2,3,4-tetrahydronaphthalen-2-yl)-N-methylacetamide,20.22 g (45.7 mmol), dissolved in 200 mL toluene at 40°C, was added by cannula over 40 min at 0°C to a suspension of sodium bis(2-methoxyethoxy)aluminum hydride in toluene, 40 mL (41.44 g suspension, 26.94 g sodium bis(2- methoxyethoxy)aluminum hydride, 133 mmol). The mixture was stirred at 0°C for 15 min, then at 35-40°C for 3 hours. The mixture was cooled to 25°C then added carefully to 70 g sodium hydroxide in 140 g ice. The resulting suspension was warmed to 25°C over 30 min, and the phases were separated. The aqueous phase was extracted with toluene; and the organic phase was washed twice with 10% aqueous sodium hydroxide, once with wat

• Trademarks

  Posicor (Hoffmann-LaRoche).

• Therapeutic Function

  Coronary vasodilator

• Biochem/physiol Actions

  Mibefradil is a tetralol derivative and nondihydropyridine calcium channel blocker. It blocks long-type (L-type) calcium channels. It blocks mildly the Purkinje-type (P-type) calcium channels in Purkinje neurons.

• Lager

  -20°C

MIBEFRADIL Upstream-Materialien And Downstream Produkte

MIBEFRADIL Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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