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    • 6. 发明授权
    • Process for the preparation of cyclopentane
    • 环戊烷的制备方法
    • US3884942A
    • 1975-05-20
    • US34346073
    • 1973-03-21
    • MAY & BAKER LTD
    • CATON MICHAEL PETER LEARCOFFEE EDWARD CHARLES JOHNWATKINS GORDON LEONARD
    • C07C405/00C07D1/22C07C69/74C07D1/20
    • C07C405/00C07C2601/08
    • Cyclopentane derivatives of the prostaglandin type of the formula:

      (WHEREIN R1 represents hydrogen or lower alkyl, R2 represents alkyl of 1 to 10 carbon atoms, the symbols R3 are the same and represent hydrogen, lower alkyl, lower alkenyl, phenyl(lower)alkyl or lower alkanoyl, R4 represents a carboxy or alkoxycarbonyl group, or an amido group unsubstituted or substituted on the nitrogen atom, X represents vinylene, ethylene, epoxyethylene or cyclopropylene, and n represents an integer of 5 to 8), which possess pharmacological properties in particular the production of hypotension, bronchodilation, inhibition of gastric acid secretion and stimulation of uterine contraction are prepared by a new six-stage process involving initially the reaction of an enamine of a cyclopentanone with an aldehyde to form a 2-hydroxyalkyl-2-cyclopenten-1-one, reacting the cyclopentenone with a source of hydrogen cyanide to form a 2hydroxyalkyl-3-oxocyclopentane-carbonitrile, reducing the carbonitrile to a 3-hydroxy-2-hydroxyalkylcyclopentanecarbaldehyde, reacting the carbaldehyde with an alkanoylmethylenephosphorane to convert the formyl group to CH CH-CO-R2, oxidising the terminal hydroxymethyl group in the 2position substituent to carboxy and the ring hydroxy group to oxo, and reducing the two oxo groups in the resulting cyclopentanonealkanoic acid to yield a 2-hydroxy-5-(3hydroxyalkenyl)cyclopentyl-alkanoic acid, and optionally converting the product into another compound of the foregoing formula:
    • 环戊烷衍生物的前列腺素类型为: