Collect. Czech. Chem. Commun. 1983, 48, 3455-3473
https://doi.org/10.1135/cccc19833455

The bromination of the epimeric 4,5-cyclopropanocholestan-3-ones

Jan Fajkoš, Jiří Joska 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

  • Miloš Buděšínský, Jan Fajkoš, Jaroslav Günter and Alexander Kasal*
    Synthesis, Reactions, Conformation Analysis, and NMR Spectra of 5,10-Epoxy-5ξ,10ξ-estrane-3,17-diones
    2005, Vol. 70, Issue 4, pp. 507–518 [Abstract]
  • 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]
  • Jan Fajkoš, Vladimír Pouzar and Ivan Černý
    Synthesis of (15E)-3β-Hydroxyandrost-5-ene-15,17-dione 15-(O-Carboxymethyl)oxime; The New Hapten for 3β-Hydroxyandrost-5-en-17-one (Dehydroepiandrosterone, DHEA)
    1996, Vol. 61, Issue 11, pp. 1647–1654 [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]
  • Jan Fajkoš and Vladimír Pouzar
    Synthesis of (19E)-17β-hydroxy-3-oxo-5α-androstan-19-al 19-(O-carboxymethyl)oxime
    1991, Vol. 56, Issue 12, pp. 2884–2891 [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]
  • Jan Fajkoš, Vladimír Pouzar and Karel Vereš
    Synthesis of (19E)-3,20-dioxopregn-4-en-19-al 19-(O-carboxymethyl)oxime
    1991, Vol. 56, Issue 5, pp. 1087–1092 [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]
  • Jan Fajkoš, Vladimír Pouzar and Karel Vereš
    Synthesis of (19E)-17β-hydroxy-3-oxoandrost-4-en-19-al 19-(O-carboxymethyl)oxime
    1990, Vol. 55, Issue 8, pp. 2086–2094 [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]
  • Jan Fajkoš and Jiří Joska
    Solvolytic rearrangements in 4β,5-cyclopropano-5β-androstane-3β,17β,19-triol 3-acetate 17-benzoate 19-p-toluenesulfonate
    1989, Vol. 54, Issue 3, pp. 751–759 [Abstract]
  • Jiří Joska, Jan Fajkoš and František Tureček
    Solvolytic rearrangements in 4β,5-cyclopropano-5β-cholestane-3β,19-diol 3-acetate 19-p-toluenesulphonate
    1987, Vol. 52, Issue 12, pp. 2991–3012 [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]
  • 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]
  • Jan Fajkoš and Jiří Joska
    Synthesis of 19-nordeoxycorticosterone 3-(O-carboxymethyl)-oxime
    1985, Vol. 50, Issue 4, pp. 973–977 [Abstract]
  • Helena Velgová and Jaroslav Zajíček
    Oxidation and epoxidation of 4,4-dimethyl-A-homo-5-cholesten-4a-ols
    1985, Vol. 50, Issue 1, pp. 114–131 [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]
  • Jiří Joska and Jan Farkaš
    Synthesis of some 1,2-unsaturated analogues of androgens with the cyclopropane ring in 4,5-position
    1984, Vol. 49, Issue 1, pp. 157–164 [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]
  • Jiří Joska and Jan Fajkoš
    Synthesis of 19-hydroxylated analogues of androstenedione and testosterone with the cyclopropane ring in 4,5-position
    1982, Vol. 47, Issue 9, pp. 2423–2432 [Abstract]
  • Ladislav Kohout, Vlastimil Šanda and Jan Fajkoš
    Synthesis of two isomeric 16,17-cyclopropano derivatives of 5-pregnene
    1982, Vol. 47, Issue 5, pp. 1503–1513 [Abstract]
  • Jan Fajkoš and Jiří Joska
    The solvolyses of 3α and 3β-p-toluenesulphonates of 19-acetoxy-5,6β-cyclopropano-5β-cholestane-3,19-diols
    1982, Vol. 47, Issue 1, pp. 144–155 [Abstract]
  • Jiří Joska and Jan Fajkoš
    Synthesis of some 19-hydroxylated androgen analogues with the cyclopropane ring in 4,5-position
    1981, Vol. 46, Issue 11, pp. 2751–2757 [Abstract]
  • Ladislav Kohout and Jan Fajkoš
    Analogues of androgens with a cyclopropane ring in 6α,7α-position
    1980, Vol. 45, Issue 7, pp. 1974–1981 [Abstract]
  • Jiří Joska and Jan Fajkoš
    Simmons-Smith methylenation of the 4,5-double bond in 19-hydroxylated steroids
    1980, Vol. 45, Issue 6, pp. 1850–1859 [Abstract]
  • Jan Fajkoš and Jiří Joska
    Synthesis of 11-hydroxylated androstane derivatives
    1980, Vol. 45, Issue 6, pp. 1845–1849 [Abstract]
  • Jan Fajkoš, Jiří Joska and František Tureček
    Solvolysis of 5,6β-cyclopropano-5β-cholestane-3β,19-diol 3-acetate 19-p-toluenesulphonate
    1980, Vol. 45, Issue 2, pp. 584–598 [Abstract]
  • Vlastimil Šanda, Ladislav Kohout and Jan Fajkoš
    5,7-Cyclo-B-homopregnane derivatives with the corticoid ketol side chain
    1980, Vol. 45, Issue 1, pp. 269–273 [Abstract]
  • Ladislav Kohout and Jan Fajkoš
    Acetolysis of 4β-methanesulphonyloxy-6β,7aβ-cyclo-B-homo-5α-cholestane
    1979, Vol. 44, Issue 11, pp. 3308–3320 [Abstract]
  • Jan Fajkoš and Jiří Joska
    Simmons-Smith methylenation of the 5,6-double bond in 19-hydroxylated steroids
    1979, Vol. 44, Issue 1, pp. 251–259 [Abstract]
  • Jiří Joska and Jan Fajkoš
    19-Hydroxysteroids substituted in position 6
    1978, Vol. 43, Issue 12, pp. 3433–3443 [Abstract]
  • Bruno Schönecker, Dieter Tresselt, Gerd Schubert, Ladislav Kohout and Jan Fajkoš
    1H-NMR investigations. Application of trichloroacetyl isocyanate to structure determination of 3-, 6-, 7-, 7a- and 17-hydroxy steroids
    1978, Vol. 43, Issue 10, pp. 2609–2618 [Abstract]
  • Jan Fajkoš and Jiří Joska
    19-Norsteroids substituted in position 7
    1978, Vol. 43, Issue 4, pp. 1142–1151 [Abstract]
  • Ladislav Kohout and Jan Fajkoš
    Methylenation of 4,6-cholestadien-3-one
    1978, Vol. 43, Issue 4, pp. 1134–1141 [Abstract]
  • Ladislav Kohout and Jan Fajkoš
    Fission of the epimeric 2,3-epoxides in the 5,7β-cyclo-B-homo-5β-cholestane series
    1978, Vol. 43, Issue 2, pp. 638–646 [Abstract]