Collect. Czech. Chem. Commun. 1985, 50, 114-131
https://doi.org/10.1135/cccc19850114

Oxidation and epoxidation of 4,4-dimethyl-A-homo-5-cholesten-4a-ols

Helena Velgová and Jaroslav Zajíček

Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6

Individual author index pages


Other CCCC articles of these authors

  • Jaroslav Zajíček, Ivan Rosenberg, Radek Liboska, Zdeněk Točík, G. Victor Fazakerley, Wilhelm Guschlbauer and Antonín Holý
    Conformational Studies on Diribonucleoside Monophosphate Analogs Containing a Nonisosteric, Isopolar, Phosphonate-Based Internucleotide Linkage
    1997, Vol. 62, Issue 1, pp. 83–98 [Abstract]
  • Jaroslav Zajíček, Jeffrey F. Ellena, Gerald D. Williams, Mohammad A. Khadim and Michael F. Brown
    Molecular Dynamics of Vesicles of Unsaturated Phosphatidylcholines Studied by 13C NMR Spin-Lattice Relaxation
    1995, Vol. 60, Issue 5, pp. 719–735 [Abstract]
  • Luboš Arnold, Jiří Smrt, Jaroslav Zajíček, Günther Ott, Michael Schiesswohl and Mathias Sprinzl
    Dimethylaminomethylene protected purine H-phosphonates in the synthesis of biologically active RNA (24-mer)
    1991, Vol. 56, Issue 9, pp. 1948–1956 [Abstract]
  • Alexander Kasal, Jenny Pokorná and Jaroslav Zajíček
    3β,11α,17-Trihydroxy-5-pregnen-20-one 11-hemisuccinate as a haptene for RIA of "17α-hydroxypregnenolone"
    1991, Vol. 56, Issue 6, pp. 1340–1347 [Abstract]
  • Alexander Kasal, Jaroslav Podlaha and Jaroslav Zajíček
    A-homo-B,19-dinorandrostanes from 6β-methanesulfonyloxy-5-methyl-19-nor-5β-androst-9-ene derivatives
    1991, Vol. 56, Issue 5, pp. 1070–1086 [Abstract]
  • Miroslav Ledvina, Jiří Farkaš, Jaroslav Zajíček, Jan Ježek and Milan Zaoral
    An alternative synthesis of O-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-(1→4)-N-acetylnormuramoyl-L-α-aminobutanoyl-D-isoglutamine
    1989, Vol. 54, Issue 10, pp. 2784–2794 [Abstract]
  • Alois Pískala, Naeem B. Hanna, Jaroslav Zajíček and Alois Čihák
    Synthesis, molecular conformation and biological activity of 6-amino-5-azacytidine
    1989, Vol. 54, Issue 9, pp. 2502–2512 [Abstract]
  • Alexander Kasal and Jaroslav Zajíček
    Spontaneous transannular reaction in Δ9-unsaturated A-homo-B,19-dinorsteroids
    1989, Vol. 54, Issue 5, pp. 1327–1335 [Abstract]
  • Ladislav Kohout, Helena Velgová, Miroslav Strnad and Miroslav Kamínek
    Brassino steroids with androstane and pregnane skeleton
    1987, Vol. 52, Issue 2, pp. 476–486 [Abstract]
  • Václav Černý, Jaroslav Zajíček and Miroslav Strnad
    2α,3α-Dihydroxy-7-oxa-6-oxo-B-homo-5α-pregnan-21-oic acid and its derivatives as brassinolide analogues
    1987, Vol. 52, Issue 1, pp. 215–222 [Abstract]
  • Ivan Bašnák, Jiří Farkaš, Jaroslav Zajíček and Zdeněk Havlas
    Synthesis of anomeric 5-cyclopropyl-2'-deoxyuridines and 1H NMR spectroscopic study of their conformation
    1986, Vol. 51, Issue 8, pp. 1764–1771 [Abstract]
  • Alexander Kasal and Jaroslav Zajíček
    Solvolysis of Westphalen-type compounds
    1986, Vol. 51, Issue 7, pp. 1462–1475 [Abstract]
  • Helena Velgová
    Participation of the oxygen-containing substituent in alkaline saponification of 3,4a-disubstituted 4,4-dimethyl-5,6β-epoxy-A-homo-5β-cholestane derivatives
    1986, Vol. 51, Issue 4, pp. 930–936 [Abstract]
  • Ladislav Kohout, Vijay Kumar Sethi, Jaroslav Zajíček and Alexander Kasal
    Solvolytic reactions of empiric 3-methanesulfonyloxy-7-benzoyloxy-5β,6β-cyclopropanocholestanes
    1986, Vol. 51, Issue 2, pp. 436–446 [Abstract]
  • Helena Velgová and Jaroslav Zajíček
    Reaction of 3,4a-disubstituted 4,4-dimethyl-5,6β-epoxy-A-homo-5β-cholestane derivatives with reducing agents
    1985, Vol. 50, Issue 11, pp. 2457–2470 [Abstract]
  • Milena Masojídková, Jaroslav Zajíček, Miloš Buděšínský, Ivan Rosenberg and Antonín Holý
    Conformational study on ribonucleoside O-phosphonylmethyl derivatives by 1H NMR spectroscopy
    1985, Vol. 50, Issue 8, pp. 1899–1905 [Abstract]
  • Jiří Joska, Jan Fajkoš and Jaroslav Zajíček
    Synthesis of 3β,4β-cyclopropano-19-nor-A-homosteroids
    1985, Vol. 50, Issue 7, pp. 1611–1617 [Abstract]
  • Jiří Závada, Václav Pechanec, Jaroslav Zajíček, Ivan Stibor and Antonín Vítek
    Effects of salt concentration and counterion on stability of alkali ion-18-crown-6 complexes in aqueous and methanolic solution: A conflicting evidence from potentiometric and sodium-23 NMR studies
    1985, Vol. 50, Issue 5, pp. 1184–1193 [Abstract]
  • Helena Velgová and Ladislav Kohout
    6,7-Secoandrostane derivatives
    1985, Vol. 50, Issue 4, pp. 962–972 [Abstract]
  • Ladislav Kohout and Jaroslav Zajíček
    Lead tetraacetate oxidation of 3β-acetoxy-B-homo-5α-cholestan-7aβ-ol
    1984, Vol. 49, Issue 1, pp. 301–305 [Abstract]
  • Jaroslav Zajíček, Miloš Buděšínský and Jiří Farkaš
    Conformational study of blocked pentofuranoses and their 1,5-anhydro derivatives by 1H NMR spectroscopy
    1984, Vol. 49, Issue 1, pp. 235–243 [Abstract]
  • Helena Velgová
    4,4-Dimethyl-A-homoandrostane epoxides
    1984, Vol. 49, Issue 1, pp. 150–156 [Abstract]
  • Jiří Joska, Jan Fajkoš and Jaroslav Zajíček
    Bromination of 19-acetoxy-4β,5-cyclopropano-5β-cholestan-3-one
    1983, Vol. 48, Issue 12, pp. 3474–3481 [Abstract]
  • Jan Fajkoš, Jiří Joska and Jaroslav Zajíček
    The bromination of the epimeric 4,5-cyclopropanocholestan-3-ones
    1983, Vol. 48, Issue 12, pp. 3455–3473 [Abstract]
  • Helena Velgová
    4,4-Dimethyl-A-homoandrostane epoxides
    1983, Vol. 48, Issue 9, pp. 2536–2548 [Abstract]
  • Helena Velgová
    Stereochemistry of epoxidation and hydroboration of some 4,4-dimethyl-A-homo-5-cholestene derivatives
    1983, Vol. 48, Issue 6, pp. 1774–1782 [Abstract]
  • Helena Velgová and Antonín Trka
    Hydrogenolytic opening of 4,4-dimethyl-4a,5-epoxy-a-homocholestane derivatives and mass spectra of some reaction products
    1983, Vol. 48, Issue 3, pp. 937–955 [Abstract]
  • Ladislav Kohout, Alexander Kasal, Vlastimil Šanda and Helena Velgová
    Rearrangement of the 16,17-cyclopropano derivatives
    1983, Vol. 48, Issue 1, pp. 173–183 [Abstract]
  • Antonín Trka and Helena Velgová
    Mass spectra of 4,4-dimethyl-A-homocholestane-3,5- and 3,4a diols and their derivatives
    1982, Vol. 47, Issue 12, pp. 3328–3338 [Abstract]
  • Antonín Trka and Helena Velgová
    Mass spectra of 4,4-dimethyl-A-homo-4a,6-cholestadien-3-ols, 4,4-dimethyl-A-homo-5-cholestene-3,4a-diols and their derivatives
    1982, Vol. 47, Issue 10, pp. 2768–2778 [Abstract]
  • Helena Velgová
    Acid catalysed opening of 4,4-dimethyl-4a,5-epoxy-A-homocholestane derivatives
    1982, Vol. 47, Issue 9, pp. 2530–2539 [Abstract]
  • Helena Velgová, Jorga Smolíková, Antonín Trka and Antonín Vítek
    Cyclopropyl→cyclobutyl rearrangement in intramolecular cyclization of 3,5-bridged B-secoandrostane-6,7(or 5,7)-diols and mass spectra of products
    1982, Vol. 47, Issue 8, pp. 2280–2290 [Abstract]
  • Helena Velgová and Antonín Trka
    Reaction of lithium aluminium hydride with 4,4-dimethyl-4a,5-epoxy-A-homocholestane derivatives and mass spectral fragmentation of some degradation products
    1982, Vol. 47, Issue 7, pp. 2007–2023 [Abstract]
  • Helena Velgová and Antonín Trka
    Epoxidation of 4,4-dimethyl-A-homo-4a-cholestene derivatives and a study of electron impact mass spectra of the epoxidation products
    1982, Vol. 47, Issue 1, pp. 315–337 [Abstract]
  • Helena Velgová and Jorga Smolíková
    4,4-Dimethyl-A-homocholestane derivatives
    1981, Vol. 46, Issue 3, pp. 607–625 [Abstract]
  • Helena Velgová, Miroslava Synáčková and Václav Černý
    Preparation of some 3α,5-cycloandrostane derivatives with expanded ring B
    1979, Vol. 44, Issue 1, pp. 260–268 [Abstract]
  • Helena Velgová, Dietrich Zeigan, Günther Engelhardt and Antonín Trka
    Cyclization of 17-ethylenedioxy-3α,5-cyclo-6,7-seco-5α-androstane-6,7-diol
    1979, Vol. 44, Issue 1, pp. 128–144 [Abstract]