申请人:May & Baker Limited
公开号:US03935261A1
公开(公告)日:1976-01-27
Cyclopentane derivatives of the prostaglandin type of the formula: ##SPC1## (wherein R.sup.1 represents hydrogen or lower alkyl, R.sup.2 represents alkyl of 1 to 10 carbon atoms, the symbols R.sup.3 are the same and represent hydrogen, lower alkyl, lower alkenyl, phenyl(lower)alkyl or lower alkanoyl, R.sup.4 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 hydroxyalkyl-3-oxocyclopentane-carbonitrile, reducing the carbonitrile to a 3-hydroxy-2-hydroxyalkyl-cyclopentanecarbaldehyde, reacting the carbaldehyde with an alkanoylmethylenephosphorane to convert the formyl group to ------CH=CH --CO--R.sup.2, oxidising the terminal hydroxymethyl group in the 2-position 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-(3-hydroxyalkenyl)cyclopentyl-alkanoic acid, and optionally converting the product into another compound of the foregoing formula.
环戊烷类前列腺素衍生物的化学式为:##SPC1##(其中,R1代表氢或低碳烷基,R2代表1至10个碳原子的烷基,符号R3相同,代表氢、低碳烷基、低碳烯基、苯基(低碳)烷基或低碳酰基,R4代表羧基或烷氧羰基,或未取代或取代氮原子的酰胺基,X代表乙烯基、环氧乙烯基或环丙烷基,n代表5至8的整数),具有药理学特性,特别是降压、支气管扩张、抑制胃酸分泌和促进子宫收缩的产生。通过一种新的六步过程制备,首先是环戊酮的恩酰胺与醛反应形成2-羟基烷基-2-环戊烯-1-酮,将环戊烯酮与氢氰酸的源反应形成羟基烷基-3-氧代环戊烷-碳腈,将碳腈还原为3-羟基-2-羟基烷基-环戊烷-羰基,将羰基与烷酰亚甲基膦酰转化为------CH=CH--CO--R2,将2-位置取代基中的末端羟甲基氧化为羧基,将环上羟基氧化为酮基,将产生的环戊烷酮烷酸中的两个酮基还原为2-羟基-5-(3-羟基烯基)环戊基-烷酸,并可选择将产物转化为上述化学式的其他化合物。