Collect. Czech. Chem. Commun.
1983, 48, 173-183
https://doi.org/10.1135/cccc19830173
Rearrangement of the 16,17-cyclopropano derivatives
Ladislav Kohout, Alexander Kasal, Vlastimil Šanda and Helena Velgová
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] - Libor Matyáš, Alexander Kasal*, Zoila Babot Riera and Cristina E. Sunol
Effects of 3α-Amino-5α-pregnan-20-one on GABAA Receptor: Synthesis, Activity and Cytotoxicity
2004, Vol. 69, Issue 7, pp. 1506–1516 [Abstract] - František Franěk*, Tomáš Eckschlager and Ladislav Kohout
24-Epibrassinolide at Subnanomolar Concentrations Modulates Growth and Production Characteristics of a Mouse Hybridoma
2003, Vol. 68, Issue 11, pp. 2190–2200 [Abstract] - Miroslav Šíša, Miloš Buděšínský and Ladislav Kohout*
Synthesis and Biological Activity of 7a-Homo- and 7a,7b-Dihomo-5α-cholestane Analogues of Brassinolide
2003, Vol. 68, Issue 11, pp. 2171–2189 [Abstract] - Barbora Slavíková*, Alexander Kasal, Hana Chodounská and Zdena Krištofíková
3α-Fluoro Analogues of "Allopregnanolone" and Their Binding to GABAA Receptors
2002, Vol. 67, Issue 1, pp. 30–46 [Abstract] - Hana Chodounská, Miloš Buděšínský, Romana Šídová, Miroslav Šíša, Alexander Kasal and Ladislav Kohout*
Simple NMR Determination of 5α/5β Configuration of 3-Oxosteroids
2001, Vol. 66, Issue 10, pp. 1529–1544 [Abstract] - Ladislav Kohout*, Hana Chodounská, Tomáš Macek and Miroslav Strnad
Synthesis of (20S)-2α,3α-Dihydroxy-6-oxo-7-oxa-7a-homo-5α-pregnane-20-carboxylic Acid as a Brassinosteroid Part of Ligands for Binding to Affinity Chromatography Carriers
2000, Vol. 65, Issue 11, pp. 1754–1761 [Abstract] - Hana Chodounská* and Alexander Kasal
Allopregnanolone Derivatives: Synthesis of 3α-Hydroxy-7a-homo-5α-pregnan-20-one
2000, Vol. 65, Issue 7, pp. 1156–1162 [Abstract] - Jaroslava Hniličková* and Ladislav Kohout
Synthesis of 21-Hydroxy-6β,19-epoxypregn-4-ene-3,20-dione
2000, Vol. 65, Issue 3, pp. 380–384 [Abstract] - Alexander Kasal*, Miloš Buděšínský, Jan Pelnař, Michael A. Bruck* and Michael F. Brown
Structures and Synthesis of 4a-Homo-7,19-dinorsteroids, X-Ray Crystallography and NMR Spectroscopy
1999, Vol. 64, Issue 12, pp. 2019–2034 [Abstract] - Barbora Slavíková* and Alexander Kasal
Epalons: Synthesis of New 16α-Carboxymethyl Derivatives
1999, Vol. 64, Issue 9, pp. 1479–1484 [Abstract] - Alexander Kasal
Epalons: Synthesis of 7-Norallopregnanolone
1999, Vol. 64, Issue 9, pp. 1471–1478 [Abstract] - Barbora Slavíková, Alexander Kasal* and Miloš Buděšínský
Autoxidation vs Hydrolysis in 16α-Acyloxy Steroids
1999, Vol. 64, Issue 7, pp. 1125–1134 [Abstract] - Carme Brosa, Ismael Zamora, Emma Terricabras and Ladislav Kohout
The Effect of Electrostatic Properties and Abibility to Form Hydrogen-Bonds on the Activity of Brassinosteroid Side-Chain Analogs
1998, Vol. 63, Issue 10, pp. 1635–1645 [Abstract] - Alexander Kasal, Jiří Polman and Miloš Buděšínský
Hydrogenation of a Tetrasubstituted Double Bond: Synthesis of 5-Methyl-19-nor-5β-pregnanes
1998, Vol. 63, Issue 10, pp. 1549–1563 [Abstract] - Hana Chodounská and Alexander Kasal
Epalons: Synthesis of 3α,7α-Dihydroxy-5α-pregnan-20-one
1998, Vol. 63, Issue 10, pp. 1543–1548 [Abstract] - Romana Šídová, Karel Stránský, Alexander Kasal, Barbora Slavíková and Ladislav Kohout
Long-Range Effect of 17-Substituents in 3-Oxo Steroids on 4,5-Double Bond Hydrogenation
1998, Vol. 63, Issue 10, pp. 1528–1542 [Abstract] - Barbora Slavíková, Alexander Kasal and Ladislav Kohout
N-Benzoyl-N-methylandrostan-17β-amines; 20-Aza Analogues of Brassinolide
1998, Vol. 63, Issue 5, pp. 655–661 [Abstract] - Ladislav Kohout, Barbora Slavíková and Miroslav Strnad
17a-Oxa-17a-homobrassinosteroid Analogues
1998, Vol. 63, Issue 5, pp. 646–654 [Abstract] - Lucie Dalibová and Ladislav Kohout
Preparation of Steroid Olefins from Heptafluorobutyrates
1998, Vol. 63, Issue 4, pp. 549–556 [Abstract] - Alexander Kasal, Barbora Slavíková, Ladislav Kohout and Miloš Buděšínský
The Synthesis of A-Homo-B-norandrostanes: The Effect of a Hydroxyl on the Course of Hydrogenation of the ∆9-Double Bond
1997, Vol. 62, Issue 10, pp. 1631–1641 [Abstract] - Barbora Slavíková, Alexander Kasal and Miloš Buděšínský
Dihydrotestosterone with an Ammonium Centre in the Position 16β
1997, Vol. 62, Issue 4, pp. 656–664 [Abstract] - Alexander Kasal, Hana Chodounská and Wojciech J. Szczepek
trans-Hydrindanes by Reduction: Synthesis of Dihydro-B-nortestosterone
1996, Vol. 61, Issue 9, pp. 1386–1395 [Abstract] - Hana Chodounská, Alexander Kasal, David Šaman and Karel Ubik
One-Pot Deuteration and Reduction of Ketones in the Synthesis of [16,16,17-2H3]-Epitestosterone
1996, Vol. 61, Issue 7, pp. 1037–1046 [Abstract] - Ladislav Kohout, Alexander Kasal and Miroslav Strnad
Pregnane-Type Brassinosteroids with a Four-Carbon Ester Functionality in Position 20
1996, Vol. 61, Issue 6, pp. 930–940 [Abstract] - Oldřich Lapčík, Richard Hampl, Martin Hill, Luboslav Stárka, Alexander Kasal, Vladimír Pouzar and Zdeněk Putz
Radioimmunological and Chromatographic Properties of Tyrosine Methyl Ester Conjugates with Stereoisomeric Steroid Carboxy Derivatives
1996, Vol. 61, Issue 5, pp. 799–807 [Abstract] - Alexander Kasal and Miloš Buděšínský
Partial Modifications of Hydroxy Groups in 5-Methyl-5β-estr-9-ene Derivatives
1996, Vol. 61, Issue 2, pp. 276–287 [Abstract] - Alexander Kasal, Ladislav Kohout and Michal Lebl
Synthesis of a Scaffold for the Creation of Non-Peptide Libraries
1995, Vol. 60, Issue 12, pp. 2147–2155 [Abstract] - Ladislav Kohout
7-Oxo-7a-oxa-brassinosteroids with Cholestane Side-Chain
1994, Vol. 59, Issue 5, pp. 1219–1225 [Abstract] - Ladislav Kohout and Alexander Kasal
7a-Keto-B-homotestosterone and 7a-Keto-B-homoepitestosterone
1994, Vol. 59, Issue 3, pp. 649–657 [Abstract] - Ladislav Kohout
New Method of Preparation of Brassinosteroids
1994, Vol. 59, Issue 2, pp. 457–460 [Abstract] - Hana Chodounská, Barbora Slavíková and Alexander Kasal
Synthesis of Some Epitestosterone Analogues
1994, Vol. 59, Issue 2, pp. 435–443 [Abstract] - Alexander Kasal
Synthesis of 17α-Hydroxy Steroids: B-Norepitestosterone
1993, Vol. 58, Issue 9, pp. 2202–2210 [Abstract] - Alexander Kasal and Světlana Pásztorová
Synthesis of RIA Haptens: 3α,11α-Dihydroxy-5α-pregnan-20-one 11-Hemisuccinate
1993, Vol. 58, Issue 3, pp. 619–628 [Abstract] - Alexander Kasal, Květa Fuksová and Vladimír Pouzar
Preparation of Unlabelled and [3H]-Labelled Epitestosterone and Its Metabolites
1993, Vol. 58, Issue 3, pp. 600–611 [Abstract] - Alexander Kasal, Richard Hampl, Zdeněk Putz, Ladislav Kohout and Luboslav Stárka
Preparation and Properties of Three Immunogens with a Spacer on the β-Side of the Steroid Skeleton and the Effect of Immunogen Structure on Specificity of the Obtained Antisera
1992, Vol. 57, Issue 10, pp. 2166–2173 [Abstract] - Ladislav Kohout and Miroslav Strnad
Brassinosteroids with Ester Function with Five Carbon Atoms at the 20 Position
1992, Vol. 57, Issue 8, pp. 1731–1738 [Abstract] - Jiří Polman and Alexander Kasal
The synthesis of 5-methyl-19-nor-5β-pregna-9,16-diene-3,20-dione, 5-methyl-19-nor-5β-pregna-9,10-diene-3,6,20-trione and their analogues with annellated E ring
1991, Vol. 56, Issue 12, pp. 2892–2905 [Abstract] - Miloš Buděšínský, Alexander Kasal, Želimír Procházka, Huynh Kim Thoa, Soňa Vašíčková and Pavel Kočovský
Revision of the structure of 3-methoxy-14α-hydroxy-D-homo-1,3,5-(10)-estratrien-17a-one. A simple 1H NMR method for the determination of configuration of hydroxy group in position 5 and/or 14 of the D-homo-steroid skeleton
1991, Vol. 56, Issue 7, pp. 1512–1524 [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] - Jiří Polman and Alexander Kasal
Synthesis of 5-methyl-19-nor-5β-pregn-9-ene derivatives
1990, Vol. 55, Issue 7, pp. 1783–1791 [Abstract] - Ladislav Kohout
Syntheis of brassino steroids with a five carbon atom ester functionality in position 17
1989, Vol. 54, Issue 12, pp. 3348–3359 [Abstract] - Alexander Kasal
Antiandrogenic A-homo-B,19-dinorandrostanes from 5β-methyl-19-norandrost-9-enes with different substituents in positions 3 and 17
1989, Vol. 54, Issue 8, pp. 2218–2228 [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] - Alexander Kasal
Antiandrogenic A-homo-B,19-dinor-analogues of androgens from 6β-chloro-5-methyl-19-nor-5β-androst-9-enes
1989, Vol. 54, Issue 5, pp. 1318–1326 [Abstract] - Ladislav Kohout
7-Methanesulfonyloxy-3α,5-cyclo-5α-cholestanes
1989, Vol. 54, Issue 4, pp. 1028–1035 [Abstract] - Ladislav Kohout and Miroslav Strnad
Brassinolide analogues without side chain
1989, Vol. 54, Issue 4, pp. 1019–1027 [Abstract] - Ladislav Kohout, Václav Černý and Miroslav Strnad
Alternative syntheses of 2α,3α,17β-trihydroxy-7-oxa-B-homo-5α-androstan-6-one and some androstane brassinolide analogs
1987, Vol. 52, Issue 4, pp. 1026–1042 [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] - Ladislav Kohout
Solvolytic reactions of epimeric 3-methanesulfonyloxy-7-benzoyloxy-5α,6α-cyclopropanocholestanes
1986, Vol. 51, Issue 10, pp. 2222–2231 [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 and Miroslav Strnad
Brassinosteroids with a cholestane side chain
1986, Vol. 51, Issue 2, pp. 447–458 [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] - Ladislav Kohout
The synthesis of 5,6-cyclopropanocholestanes with oxygen functions in positions 3 and 7
1986, Vol. 51, Issue 2, pp. 429–435 [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] - Alexander Kasal, Ladislav Kohout and Jiří Filip
4,5-Secoandrostanes by Eschenmoser's reaction
1985, Vol. 50, Issue 6, pp. 1402–1414 [Abstract] - Helena Velgová and Ladislav Kohout
6,7-Secoandrostane derivatives
1985, Vol. 50, Issue 4, pp. 962–972 [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] - Luboslav Stárka, Alexander Kasal, Marie Bičíková and Richard Hampl
Preparation and synandrogenic activity of 17β-hydroxy-4,5-seco-5-androsten-3-one
1984, Vol. 49, Issue 12, pp. 2942–2947 [Abstract] - Alexander Kasal and Jorga Smolíková
Photochemical 6β-hydroxylation of 11β-hydroxy-4-androstene-3,17-dione
1984, Vol. 49, Issue 12, pp. 2932–2941 [Abstract] - Alexander Kasal
A new type of A-homo-B-norcholestane derivatives
1984, Vol. 49, Issue 4, pp. 892–902 [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] - Helena Velgová
4,4-Dimethyl-A-homoandrostane epoxides
1984, Vol. 49, Issue 1, pp. 150–156 [Abstract] - Helena Velgová
4,4-Dimethyl-A-homoandrostane epoxides
1983, Vol. 48, Issue 9, pp. 2536–2548 [Abstract] - Ladislav Kohout and Alexander Kasal
Electrophilic addition to the 5,6-double bond in A-nor-3,5-secosteroids
1983, Vol. 48, Issue 7, pp. 2051–2063 [Abstract] - Alexander Kasal, Luboš Stárka, Richard Hampl and Ladislav Kohout
Preparation and pharmacological properties of 4,5-secopregnane-3,20-dione and its derivatives
1983, Vol. 48, Issue 7, pp. 2040–2050 [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] - Alexander Kasal
4-Thia-5-cholesten-3-one and some further steroidal δ-thioenol lactones
1983, Vol. 48, Issue 5, pp. 1489–1498 [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] - 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] - Alexander Kasal
Desulfuration of steroidal thians
1982, Vol. 47, Issue 11, pp. 3148–3159 [Abstract] - Antonín Trka and Alexander Kasal
Inductive effect in EI-mass spectra of some 5,6-dihalogenides and 5,6-halohydrins of 5α-cholestan-3β-ol and 3β-acetoxy-5α-cholestane
1982, Vol. 47, Issue 11, pp. 2946–2960 [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] - 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] - 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] - Alexander Kasal and Ladislav Kohout
4,5-Secoanalogues of dihydrotestosterone with a cyclopropane ring in the position 5(6)
1982, Vol. 47, Issue 1, pp. 130–143 [Abstract] - Alexander Kasal
Hydrogenation of 12-oxo-5β-chol-9(11)-enates on platinum
1981, Vol. 46, Issue 8, pp. 1839–1849 [Abstract] - Ladislav Kohout
Synthesis of 5,6-cyclopropanocholestane derivatives with an oxygen function in position 7
1981, Vol. 46, Issue 8, pp. 1828–1838 [Abstract] - Helena Velgová and Jorga Smolíková
4,4-Dimethyl-A-homocholestane derivatives
1981, Vol. 46, Issue 3, pp. 607–625 [Abstract] - Alexander Kasal and Antonín Trka
Splitting off of water from the molecular ions of steroidal cyclopropyl ketones
1980, Vol. 45, Issue 11, pp. 2985–2997 [Abstract] - Alexander Kasal
Analogues of androgens with the open ring A
1980, Vol. 45, Issue 9, pp. 2541–2549 [Abstract] - František Tureček and Ladislav Kohout
The stereospecific loss of water from B-homocholestanols under electron impact
1980, Vol. 45, Issue 9, pp. 2433–2442 [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] - Antonín Trka and Alexander Kasal
Electron impact mass spectra of some vicinal trans-dihalo- and trans-hydroxyhalocholestanes
1980, Vol. 45, Issue 6, pp. 1720–1733 [Abstract] - Pavel Kočovský, Ladislav Kohout and Václav Černý
Participation of 19-substituents in electrophilic additions to 6,7-unsaturated 5α-cholestane and B-homo 5α-cholestane derivatives; A case of competition between the participation of an ambident neighboring group and external nucleophile attack
1980, Vol. 45, Issue 2, pp. 559–583 [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] - Alexander Kasal
Deoxygenation at the carbon C(5) of 3,6-cyclo-A-nor-3,5-secoandrostanes
1979, Vol. 44, Issue 5, pp. 1619–1629 [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] - 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] - Alexander Kasal
Synthesis of 3,6-cyclo-A-nor-3,5-secoandrostanes
1978, Vol. 43, Issue 7, pp. 1778–1792 [Abstract] - Ladislav Kohout and Jan Fajkoš
Methylenation of 4,6-cholestadien-3-one
1978, Vol. 43, Issue 4, pp. 1134–1141 [Abstract] - Ladislav Kohout
2,3-Disubstituted derivatives of the 6β,7aβ-cyclo-B-homo-5α-cholestane series
1978, Vol. 43, Issue 3, pp. 889–899 [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] - Alexander Kasal
Reduction of some 3,6-cyclo-A-nor-3,5-seco-6β-cholestanes
1978, Vol. 43, Issue 2, pp. 498–510 [Abstract]
