Hernández-Linares MG, Sandoval-Ramírez J, Meza-Reyes S, Montiel-Smith S, Fernández-Herrera MA, Bernès S. Deacylation reactions of 20-acetyl dinorcholanic lactones and 20,23-diacetyl furost-22-enes.
Steroids 2010;
75:240-4. [PMID:
20034505 DOI:
10.1016/j.steroids.2009.12.008]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2009] [Revised: 12/11/2009] [Accepted: 12/14/2009] [Indexed: 10/20/2022]
Abstract
We report the deacylation of (20R)-20-acetyl-23,24-dinorcholanic lactones by hydrazine hydrate, under microwave irradiation in high yields. The elimination of the 20-acetyl group proceeded with retention of configuration which contrast with other proved deacylation methods that yield a mixture of diastereoisomers. In this way, unnatural (20R)-23,24-dinorcholanic lactones can be produced rapidly on a large scale. Both (20R)- and (20S)-lactones were prepared starting from diosgenin, hecogenin and sarsasapogenin, in 72-80% overall yields.
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