Iványi Z, Szabó N, Wölfling J, Szécsi M, Julesz J, Schneider G. Novel series of 17β-pyrazolylandrosta-5,16-diene derivatives and their inhibitory effect on 17α-hydroxylase/C(17,20)-lyase.
Steroids 2012;
77:1152-9. [PMID:
22809751 DOI:
10.1016/j.steroids.2012.07.001]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 06/27/2012] [Accepted: 07/04/2012] [Indexed: 11/23/2022]
Abstract
The Claisen condensation of 3β-acetoxypregna-5,16-dien-20-one (1) with ethyl formate in the presence of sodium methylate in pyridine is known to lead to 3β-hydroxy-21-hydroxymethylidenepregna-5,16-dien-20-one (2) in good yield. With the methods described for the preparation of the saturated D-ring pyrazolyl series, the reactions of 2 with phenylhydrazine and its p-substituted derivatives in acetic acid resulted in mixtures of two steroidal regioisomers, the 1'-aryl-3'-pyrazolyl-(4a-e) and 1'-aryl-5'-pyrazolyl (5a-e) steroids. Compounds 4a-e are unknown in the literature. The arylpyrazoles produced were tested against 17α-hydroxylase/C(17,20)-lyase (P450(17α)) in vitro and neither of the regioisomers exerted efficient inhibition.
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