Wölfling J, Hackler L, Mernyák E, Schneider G, Tóth I, Szécsi M, Julesz J, Sohár P, Csámpai A. Neighboring group participation. Part 15. Stereoselective synthesis of some steroidal tetrahydrooxazin-2-ones, as novel presumed inhibitors of human 5alpha-reductase.
Steroids 2004;
69:451-60. [PMID:
15246775 DOI:
10.1016/j.steroids.2004.04.003]
[Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2004] [Revised: 04/02/2004] [Accepted: 04/08/2004] [Indexed: 11/25/2022]
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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