Collect. Czech. Chem. Commun.
1992, 57, 1928-1936
https://doi.org/10.1135/cccc19921928
Z-Isomers of Steroid 17β-Side Chain Methyl Acrylates
Vladimír Pouzar, Ivan Černý and Pavel Drašar
Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6
Abstract
THP-Protected androstan-3-ol 17β-carboxaldehydes I-III with 3β,5-ene, 3β,5α, and 3α,5α respective arrangements, were transformed into corresponding methyl Z- and E-acrylates IVa-IXa. Peterson olefination by methyl trimethylsilylacetate gave mainly Z-isomers, whereas under conditions of Wittig-Horner reaction with trimethyl phosphonoacetate E-isomers were obtained in more stereoselective manner. THP-Ethers of methyl Z-acrylates IVa, VIa, and VIIIa were deprotected and from resulting 3-hydroxy derivatives IVb, VIb, and VIIIb the hemisuccinates IVd, VId, and VIIId and β-D-glucopyranosides IVf, VIf, and VIIIf were prepared.
