Helena Velgová
Czechoslovak Academy of Sciences
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Publication
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Steroids | 1994
Helena Velgová; Alexander Kasal; Miloš Buděšínský
Abstract Careful epoxidation of the Δ16-olefins 3 and 4 yielded 16α,17α-epoxides 5 and 6 which were reduced by lithium aluminium hydride, oxidized, and dehydrated to 17α-hydroxycholest-4-en-3-one 20, i.e., an epitestosterone homolog containing a well tolerated alkyl group at position 17. Under catalysis of acids, epoxide 5 was rearranged to Δ13-16α-alcohol 10. Less careful epoxidation of Δ16-olefin 4 with excess of peroxy acid led to products of double epoxidation (i.e., epoxidation, rearrangement, and another oxidation) 7 and 12. Structures of products of rearrangement were studied mainly by NMR spectroscopy. (Steroids 59: 335–340, 1994)
Collection of Czechoslovak Chemical Communications | 1987
Ladislav Kohout; Helena Velgová; Miroslav Strnad; M. Kamínek
Collection of Czechoslovak Chemical Communications | 1968
Helena Velgová; L. Lábler; V. Černý; F. Šorm; K. Sláma
Collection of Czechoslovak Chemical Communications | 1969
Helena Velgová; V. Černý; F. Šorm; K. Sláma
Collection of Czechoslovak Chemical Communications | 1983
Ladislav Kohout; Alexander Kasal; Vlastimil Šanda; Helena Velgová
Collection of Czechoslovak Chemical Communications | 1985
Helena Velgová; Jaroslav Zajíček
Collection of Czechoslovak Chemical Communications | 1985
Helena Velgová; Ladislav Kohout
Collection of Czechoslovak Chemical Communications | 1979
Helena Velgová; Dietrich Zeigan; Günther Engelhardt; Antonín Trka
Collection of Czechoslovak Chemical Communications | 1979
Helena Velgová; Miroslava Synáčková; V. Černý
Collection of Czechoslovak Chemical Communications | 1974
Helena Velgová; V. Černý
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