Method for the production of 4-(17alpha-substituted-3-oxoestra- 4,9-dien-11beta-yl)benzaldehyd-(1E or 1Z)-oximes
3,3-Dimethoxy-5alfa, 10alfa-epoxy-estr-9(11)-en-17-one of formula (II) is converted with an active methylene reagent in an inert solvent into a 5alfa, 10alfa-epoxy-17(S)-spiroepoxide of formula (IX), which, after regio- and stereoselective cleavage of the 17-spiroepoxy group by alkali or alkaline-ea...
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Zusammenfassung: | 3,3-Dimethoxy-5alfa, 10alfa-epoxy-estr-9(11)-en-17-one of formula (II) is converted with an active methylene reagent in an inert solvent into a 5alfa, 10alfa-epoxy-17(S)-spiroepoxide of formula (IX), which, after regio- and stereoselective cleavage of the 17-spiroepoxy group by alkali or alkaline-earth alcoholate, by alkylmercaptans in the presence of alkali hydroxides or potassiumterc-butanolate, by direct cleavage with alkali mercaptides or with perfluoroalkyl alcohols in the presence of alkali in an inert solvent, is opened to a 17alfa-substituted compound of formula (X), which optionally is converted by reaction of the 17beta-hydroxyl group with alkyl halides or haloalkyl fluorides in the presence of strong bases in an inert solvent into the 17beta-ethers or 17-fluoroalkyl ethers of formula (X), which is reacted with a 4-bromobenzaldehyde ketal, magnesium and CuCl at temperatures of between -35°C and room temperature to form the corresponding 3,3-dimethoxy-5alfa -hydroxy-17alfa-CH2Y-11beta-benzaldehyde ketal of formula (XI), which is converted by acid hydrolysis of the protective groups into an 11beta -benzaldehyde derivative of formula (XII) and the aldehyde function is converted selectively by hydroxylammonium salts into a mixture of E/Z-benzaldoximes of general formula (I).
3,3-Dimetoxy-5alfa, 10alfa-epoxy-estr-9(11)-en-17-ón vzorca (II) sa konvertuje účinným metylénovým činidlom v inertnom rozpúšťadle na 5alfa, 10alfa-epoxy-17 (S)-spiroepoxid vzorca (IX), ktorý sa po regio- a stereoselektívnom rozštiepení 17-spiroepoxyskupiny pomocou alkoholátu alkalického kovu alebokovu alkalických zemín, alkylmerkaptánov v prítomnosti alkalických hydroxidov alebo kálium-terc-butanolátu, pomocou priameho rozštiepenia pomocou alkalických merkaptidov alebo pomocou perfluóralkylalkoholov v prítomnosti alkálie v inertnom rozpúšťadle otvorí, pričom vznikne 17alfa-substituovaná zlúčenina vzorca (X), ktorá sa prípadne konvertuje reakciou 17beta-hydroxylovej skupiny s alkylhalogenidmi alebo halogénalkylfluoridmi v prítomnosti silných zásad v inertnom rozpúšťadle na 17beta-étery alebo 17-fluóralkylétery vzorca (X), ktoré sa podrobia reakcii s 4-brómbenzaldehydketálom, horčíkom aCuCl pri teplotách v rozsahu -35 °C a izbovou teplotou, pričom vzniká zodpovedajúci 3,3-dimetoxy-5alfa-hydroxy-17alfa-CH2Y- 11beta- benzaldehydketál vzorca (XI), ktorý sa kyslou hydrolýzou ochrannýchskupín prevedie na 11beta-benzaldehydový derivát vzorca (XII) a aldehydová funkčná skupina sa pomocou |
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