Neighboring group participation. Part 15. Stereoselective synthesis of some steroidal tetrahydrooxazin-2-ones, as novel presumed inhibitors of human 5alpha-reductase |
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Authors: | Wölfling János Hackler László Mernyák Erzsébet Schneider Gyula Tóth István Szécsi Mihály Julesz János Sohár Pál Csámpai Antal |
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Institution: | Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720, Hungary. |
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Abstract: | During the alkaline methanolysis of 3beta-acetoxy-21-chloromethyl-pregn-5-ene-20beta-N-phenylurethane, and its p-substituted phenyl derivatives, cyclization occurs, in the course of which 17beta-3-(N-phenyl)tetrahydrooxazin-2-on-6-yl]androst-5-en-3beta-ol and its p-substituted phenyl derivatives are formed. The cyclization takes place with (N(-)-6) neighboring group participation. Oppenauer oxidation of the 3beta-hydroxy-exo-heterocyclic steroids yielded the corresponding delta4-3-ketosteroids. The structures of the new compounds were proved by IR, 1H and 13C NMR spectroscopy, using up-to-date measuring techniques such as 2D-COSY, HMQC, and HMBC. The inhibitory effects (CI50) of the delta4-3-ketosteroids on 5alpha-reductase were studied. |
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Keywords: | Heterocyclic steroids Neighboring group participation 5α-Reductase In vitro inhibition Structure determination by IR and NMR |
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