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Ivan Černý

Slovak University of Agriculture in Nitra

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Vladimı́r Pouzar

Czech Academy of Sciences

107

Pavel Drašar

University of Chemistry and Technology, Prague

Miroslav Havel

Czech Academy of Sciences

M. HAVEL

Institut Mines-Télécom

Vladimír Pačuta

Slovak University of Agriculture in Nitra

Miloš Buděšı́nský

Czech Academy of Sciences, Institute of Organic Chemistry and Biochemistry

Martin Hill

Institute of Endocrinology

Tereza Slavı́ková

Czech Academy of Sciences

Dávid Ernst

Slovak University of Agriculture in Nitra

Richard Hampl

Institute of Endocrinology

Cooperative Institutions

Slovak University of Agriculture in Nitra

Charles University

Czech Academy of Sciences, Institute of Organic Chemistry and Biochemistry

Czech Academy of Sciences

Institute of Endocrinology

Research Institute for Pharmacy and Biochemistry (Czechia)

University of Chemistry and Technology, Prague

General University Hospital in Prague

University of Pardubice

Comenius University Bratislava

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Yield and quality of chicory (Cichorium intybus L.) in dependence on variety and foliar application of Atonik and Polybor 150.

Journal of Central European Agriculture (2008)

Ivan Černý Vladimír Pačuta Marek Kovár

The influence of variety and foliar applications of Atonik and Polybor 150 on root yield and inulin content in root of chicory (Cichorium Intybus L.) plant were observed in field polyfactorial experiment. The field trials were established on experimental station Dolna Malanta in warm maize production area in 2005 and 2006 years. The root yield and inulin content were statistically high significantly influenced by year’s weather conditions. In term of obtained root yield and inulin content in root the combination of foliar preparations on variant B (Atonik: 0.4 l ha-1 in 2nd post-emergence herbicide application; Atonik + Polybor 150: 0.6 + 2.5 l ha-1 in 3rd post-emergence herbicide application; Polybor 150: 2.5 l ha-1 in 1st fungicide treatment) was shown to be optimal in given agri-ecological conditions. Biological material affected the formation of yield parameters very differently. The highest yield of root was observed at variety Fredonia Nova and inulin content in root at variety Maurane (both statistically significant).

Cichorium

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Synthesis of 17β-steroidal 4-(2-butenolides)

Collection of Czechoslovak Chemical Communications (1983)

Ivan Černý Vladimı́r Pouzar Pavel Drašar Miroslav Havel

Derivatives of 5-androsten-3β-ol with 2-butenolide ring in position 17β were prepared by addition of lithium salt of protected propargyl alcohol to 17β-carbaldehyde IV , hydrogenation of the formed isomeric acetylenes over P-2 nickel and oxidative cyclization of the obtained olefinic 20,24-diols IX and X . Stereochemistry of the desired lactones XII and XIII was determined by CD spectroscopy. The 17β-(2-furyl) derivative XI was formed as the cyclization side-product. The 3β-hydroxyl was protected by a methoxymethyl group which allowed a selective removal of tetrahydropyranyl group during the synthesis.

Butenolide

Propargyl

Derivative (finance)

Propargyl alcohol

10.1135/cccc19832064

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Preparation and absolute configuration at C(22) of 21,26,27-trinor-5α-cholestan-25→22-olide derivatives

Collection of Czechoslovak Chemical Communications (1985)

Vladimı́r Pouzar Pavel Drašar Ivan Černý Miroslav Havel

Epimeric 21,26,27-trinor-5α-cholestan-25→22-olides ( X and XVII ), 21,26,27-trinor-5α-cholest-23-en-25→22-olides ( XV and XXII ), and their 23-methyl derivatives XVI and XXIII were prepared by lengthening the side chain in 5α-pregnan-21-al ( I ). On the basis of CD spectra and chemical correlations with 21,26,27-trinor-5α-cholestane-22,25-diols, the configuration 22 S was ascribed to lactones X, XXII and XXIII whereas lactones XV, XVI and XVII were assigned the 22 R configuration.

Absolute Configuration

Cholestane

10.1135/cccc19850869

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Citations (2)

15α-Hydroxytestosterone produced in vitro and in vivo in the sea lamprey, Petromyzon marinus

General and Comparative Endocrinology (2003)

Mara Bryan Alexander P. Scott Ivan Černý Sang‐Seon Yun Weiming Li

Petromyzon

Tritiated water

10.1016/s0016-6480(03)00104-7

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Citations (24)

Synthesis of Linear Steroid Oligoesters Based on Etienic Acid

Collection of Czechoslovak Chemical Communications (2002)

Miroslav Reschel Miloš Buděšı́nský Ivan Černý Vladimı́r Pouzar Pavel Drašar

Linear oligoesters based on etienic acid (3β-hydroxyandrost-5-ene-17β-carboxylic acid) containing 2-4 steroid units were prepared employing mixed anhydride esterification. NMR spectra of the oligomeric steroids have been fully assigned.

10.1135/cccc20021709

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β-Glucosides of steroidal unsaturated nitriles

Collection of Czechoslovak Chemical Communications (1987)

Ivan Černý Vladimı́r Pouzar Pavel Drašar Miroslav Havel

Reaction of 3β-methoxymethoxy-5-pregnen-20-one ( Ia ) with diethyl cyanomethylphosphonate and subsequent removal of the protecting group afforded (20 E )-3β-hydroxy-24-norchola-5,20(22)-diene-23-nitrile ( IIIa ). Besides the analogous derivative IIIb with another double bond in position 14, the fully saturated compounds IIIc and IIId with configuration 5α and 5β, respectively, were prepared similarly. Silver silicate-catalyzed glycosylation of IIIa-IIId with tetra-O-acetyl-α-D-glucopyranosyl bromide gave β-D-glucopyranosides IVa-IVd in 77-89% yield. A parallel series of hemisuccinates VIa-VId was prepared in 64-81% yields by reaction of IIIa-IIId with 2-(trimethylsilyl)ethyl hydrogen butanedioate followed by deblocking with tetrabutylammonium fluoride. The glucoside IVa was prepared also by an alternative reaction pathway starting from 3β-hydroxy-5-pregnen-20-one ( VIII ). Compound VIII was converted in 80% yield into the glucoside IX which, after protection as the tetra-O-(trimethylsilyl)derivative XII , was treated with diethyl cyanomethylphosphonate.

Trimethylsilyl

Derivative (finance)

Hydrogen bromide

10.1135/cccc19872521

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Citations (1)

Neuroactive steroids with perfluorobenzoyl group

Steroids (2012)

Ivan Černý Miloš Buděšı́nský Vladimı́r Pouzar Vojtěch Vyklický Barbora Hrčka Krausová

10.1016/j.steroids.2012.07.004

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Citations (4)