Misoprostol Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R45:Kann Krebs erzeugen.
R60:Kann die Fortpflanzungsf?higkeit beeintr?chtigen.
R61:Kann das Kind im Mutterleib sch?digen.
R25:Giftig beim Verschlucken.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S53:Exposition vermeiden - vor Gebrauch besondere Anweisungen einholen.
S22:Staub nicht einatmen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn m?glich, dieses Etikett vorzeigen).
Beschreibung
Misoprostol is an orally-active PGEl analog useful in the treatment of gastric and
duodenal ulcers. As with other agents of this type, misoprostol may prove useful
as a gastric cytoprotective when administered concurrently with irritating drugs
such as nonsteroidal antiinflammatories.
Chemische Eigenschaften
Misoprostol is a yellow, viscous liquid with a musty odour. Miscible with ethanol, ether or chloroform, extremely insoluble in water or n-hexane. Very unstable at room temperature and undergoes thermal epimerization to the 8-isomer. It is also extremely sensitive to the Ph value. It removes the hydroxyl group at the 11α position in acidity and alkalinity, converts it into A-type prostaglandins, and isomerizes into B-type prostaglandins. However, it is relatively stable in the dispersion system of hydroxypropyl methylcellulose and can be stored at room temperature.
Verwenden
Misoprostol is a cytoprotective prostaglandin PGE1 analogue that inhibits gastric acid secretion. It has many medical uses, including nine obstetric indications. The drug was originally produced by Pfizer for the treatment of gastric ulcers. Misoprostol is commonly used to prevent NSAID-induced gastric ulcers in patients at high risk of complications from a gastric ulcer, such as elderly patients and patients with a history of ulcer. It has also been used in treating duodenal ulcers unresponsive to histamine H2-antagonists; the drug does not prevent duodenal ulcers,however, in patients taking NSAIDS. Misoprostol can cause miscarriage, often associated with potentially dangerous bleeding.
Indications
Misoprostol (Cytotec), which is an analogue of
prostaglandin E1, has been approved for use in the prevention
of nonsteroidal antiinflammatory drug–induced
ulceration. It also is approved in other countries for the
treatment of peptic ulcer disease.
synthetische
synthesis of Misoprostol
To a 1000 ml dried flask under a nitrogen atmosphere was added 74.6 g of(E)-trimethyl-[[1-methyl-1-[3-(tributylstannyl)-2-propenyl]pentyl]oxy]silane,125 ml anhydrous THF and 24.2 g of copper (I) iodide. The mixture wasstirred at room temperature for 30 minutes and then it was cooled to -25 to -30°C. 98.8 ml of methyllithium (2.86 M) in DEM was added dropwise and theresultant solution was stirred at -15°C for 2 hours. Then the reaction mixturewas cooled to -78°C and 25 g of methyl-5-oxo-3-[(triethylsilyl)oxy]-1-cyclopentene-1-heptanoate in 100 ml of THF was added rapidly. After stirringthe mixture for 5 min at -78°C, it was quenched into a mixture of 750 ml ofaqueous ammonium chloride solution and 200 ml of ammonium hydroxide.The resulting mixture was warmed to room temperature and stirred until adeep blue aqueous layer was obtained. Ethyl acetate (250 ml) was used forextraction. Then the combined organic layers were washed with brine andsubsequently dried over magnesium sulfate. After a filtration andconcentration under reduced pressure, an oil (105 g) was obtained. This oilcontaining the protected prostaglandin was subjected to acidic deprotection(cat. PPTS, acetone and water) and purification (chromatography on silica gel)to provide 15.8 g (60%) of misoprostol was identical.
Biologische Aktivit?t
Cytoprotective prostaglandin E 1 analog that displays agonist activity at EP receptors. K i values are 120, 250, 67 and 67 nM at cloned mouse EP 1 , EP 2 , EP 3 and EP 4 receptors respectively. Prevents NSAID-induced gastric ulceration.
Pharmakologie
Misoprostol is absorbed
rapidly after oral administration and is hydrolyzed
to the active compound. It is metabolized by
the liver and excreted mainly in the urine. Adverse effects
include crampy abdominal pain, dose-related diarrhea,
and uterine contractions. The last-named effect
has led to its use in the control of postpartum bleeding.
Mode of action
Misoprostol is a synthetic prostaglandin E1 analogue which has ulcer healing, gastric acid antisecretory and mucosal protective properties. The antisecretory activity is mediated by direct action on specific prostaglandin receptors on the surface of gastric parietal cells. In dogs with innervated Pavlov pouches, inhibition of secretion is achieved at a lower dosage by intrapouch injection than by intravenous or intragastric administration, suggesting that the local effect may predominate. The mucosal protective effect against various damaging agents has been demonstrated in humans with doses that inhibit and doses which minimally affect acid secretion.
Misoprostol Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
