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    Wyświetlanie 1-7 z 7
    Tytuł:
    Syntezy pochodnych układu pirazolo[4,3-c]heterocyklicznego
    Synthesis of pyrazolo[4,3-c]heterocyclic derivatives
    Autorzy:
    Wójcicka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171606.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    pochodne pirazolo[4,3-c]heterocykliczne pirazolo[4,3-c]pirydyny
    pirazolo[4,3-c]chinoliny
    pirazolo[4,3-c]naftyrydyny
    synteza
    pyrazolo[4,3-c]heterocyclic derivatives pyrazolo[4,3-c]pyridine
    pyrazolo[4,3-c]quinoline pyrazolo[4,3-c]naphthyridine
    synthesis
    Opis:
    The broad spectrum of biological activity of pyrazolo[4,3-c]heterocyclic derivatives is the main of reason for the preparation of new compounds containing this scaffold. This review presents most of the literature data on the synthesis of pyrazolo[ 4,3-c]heterocyclic derivatives. This isomer system containing pyrazole moiety condensed with a heterocyclic ring can be synthesized from a different substrates, but that synthesis may be classified into two main categories: annulation of the pyrazole ring onto heterocyclic derivatives or annulation of the heterocyclic ring onto pyrazole analogs. The main goal of this study is the presentation of various methods for the preparation of the pyrazolo[4,3-c]pyridine (Rys. 2) [1–15], pyrazolo[4,3-c] quinoline (Rys. 3) [16–63], pyrazolo[4,3-c]isoquinoline [64, 65], pyrazolo[4,3-c] naphthtyridine [66–68], pyrazolo[4,3-c]thiazine [69–72], pyrazolo[4,3-c]cinnoline [73, 74], pyrazolo[4,3-c]quinolizine [75], and pyrazolo[4,3-c]pyridazine [76] derivatives.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 11-12; 1075-1104
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synteza i aktywność biologiczna pochodnych pirolo [3,4-c]pirydyny
    Synthesis and biological activity of pyrrolo[3,4-c]pyridine derivatives
    Autorzy:
    Wójcicka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172668.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    pochodne pirolo[3,4-c]pirydyny
    synteza
    aktywność biologiczna
    pyrrolo[3,4-c]pyridine derivatives
    synthesis
    biological activity
    Opis:
    Pyrrolo[3,4-c]pyridine is one of the six structural isomers of the bicyclic ring system containing pyrrole moiety condensed with a pyridine nucleus. This review presents most of the literature data about synthetic pyrrolo[3,4-c]pyridine derivatives and their biological activity. S. Gabriel and J. Colman [4] discovered this isomer for the first time and named it “merimine” [Fig. 3]. The main goal of this study is the presentation of various methods for the preparation of pyrrolo[3,4-c]pyridine derivatives. Compounds containing the pyrrolo[3,4-c]pyridine scaffold can be synthesized from different substrates, but the syntheses may be classified into two main categories: annulation of pyrrole ring onto pyridine derivatives or annulation of pyridine ring onto pyrrole derivatives. Biological investigations have shown that pyrrolo[3,4-c]pyridine derivatives have a wide spectrum of actions. Most of them have been studied as analgesic and sedative agents [35–40]. Antitumor [19, 42, 45], antiviral [27], antituberculostatic [43] activities have been found. Pyrrolo[3,4-c]pyridine derivatives can also be used in the treatment of nervous [20, 41] and immune [19, 42] system diseases.
    Źródło:
    Wiadomości Chemiczne; 2013, 67, 3-4; 251-276
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki, selenu i telluru. Część 2. Sulfurany 10-S-3 i 10-S-4
    Hypervalent compounds of sulfur, selenium and tellurium. Part 2. Sulfuranes 10-S-3 and 10-S-4
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172591.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    sulfuran
    pseudorotacja Berry'ego
    bipiramida trygonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    sprzęganie ligandów
    wymiana liganda
    hypervalency
    3c-4e bond
    sulfurane
    Berry pseudorotation
    trigonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    ligand coupling
    ligand exchange
    Opis:
    The compounds presented herein are sulfuranes 10-S-3 and 10-S-4 containing hypervalent sulfur atom. They have been known for a relatively long time. Nevertheless, they, and especially 10-S-4 species, are still of great interest due to their unique properties. The review presents recent approaches to the synthesis of these compounds, their selected structural, physical, chemical, stereochemical and electronic properties and their use as reagents and catalysts in several reaction types. The presence of structures of these types as intermediates, which explains selected reaction mechanisms, will also be shown.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 7-8; 593-622
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki, selenu i telluru. Część 4. Selenurany i tellurany
    Hypervalent compounds of sulfur, selenium and tellurium. Part 4. Selenuranes and telluranes
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171678.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    selenuran
    perselenuran
    telluran
    pertelluran
    bipiramida trygonalna
    bipiramida tetragonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    inwersja klinowa
    hypervalency
    3c-4e bond
    selenurane
    perselenurane
    tellurane
    pertellurane
    trigonal bipyramid
    tetragonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    cuneal inversion
    Opis:
    In this part selenuranes (10-Se-4 and 10-Se-5) and perselenuranes 12-Se-6 as well as telluranes 10-Te-4 and pertelluranes 12-Te-6 will be presented. The main goal is to describe recent reports on the synthesis, chemical, physical, spectral and conformational behavior, stereochemistry, stability and biological activity of these compounds. Their occurrence as reaction intermediates will also be shown.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 11-12; 1119-1144
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki , selenu i telluru. Część 3. Sulfuran Martina , sulfurany 10-S-5 i 12-S-6
    Hypervalent compounds of sulfur, selenium and tellurium. Part 3. Martin su lfurane , sulfuranes 10-S-5 and 12-S-6
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171640.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    sulfuran
    persulfuran
    sulfuran Martina
    bipiramida trygonalna
    bipiramida tetragonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    sprzęganie ligandów
    hypervalency
    3c-4e bond
    sulfurane
    persulfurane
    Martin sulfurane
    trigonal bipyramid
    tetragonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    ligand coupling
    Opis:
    In this part of the review one of the most famous 10-S-4 sulfurane called Martin sulfurane together with sulfuranes 10-S-5 and persulfuranes 12-S-6 will be presented. Martin sulfurane has been well known for a relatively long time but it is still useful in organic synthesis as a dehydrating, coupling and oxidizing agent. Its use in selected substitution reactions will be also described. Next, synthesis and selected properties of sulfuranes 10-S-5, mainly sulfurane oxides, and persulfuranes 12-S-6, will be shown. Besides synthetic methods, the review is focused on the investigations of the stability and isomerization of these types of compounds, which is particularly interesting for persulfuranes, because of the presence of three 3c-4e bonds.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 9-10; 893-907
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiperwalentne związki siarki, selenu i telluru. Część 1. Charakterystyka ogólna
    Hypervalent compounds of sulfur, selenium and tellurium. Part 1. General characteristics
    Autorzy:
    Zając, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/172599.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    hiperwalentność
    wiązanie 3c-4e
    sulfuran
    persulfuran
    selenuran
    perselenuran
    telluran
    pertelluran
    pseudorotacja Berry'ego
    sulfuran Martina
    bipiramida trygonalna
    bipiramida tetragonalna
    synteza
    chiralność
    aktywność optyczna
    izomeryzacja
    hypervalency
    3c-4e bond
    sulfurane
    persulfurane
    selenurane
    perselenurane
    tellurane
    pertellurane
    Berry pseudorotation
    Martin sulfurane
    trigonal bipyramid
    tetragonal bipyramid
    synthesis
    chirality
    optical activity
    isomerization
    Opis:
    The goal of this four-part review is a presentation of the results of recent studies on the properties and chemistry of hypervalent sulfur, selenium and tellurium compounds. The term “hypervalency” has been known since 1969 when Musher used it to describe molecules bearing heteroatoms which formally did not fulfill the octet rule. This violation was explained by the postulate concerning the existence of a 3-center 4-electron bond between a hypervalent heteroatom and two axial electronegative ligands. The bond is the a combination of two ligand orbitals and a pz orbital of a central heteroatom which results in the formation of three molecular orbitals. The distances between the central atom and these two ligands are longer than the length of the typical sp2 bonds, such as equatorial ones. Moreover, the effective electron density is shifted from the central atom towards the axial ligands what results in the fulfillment of the octet rule of this atom. The geometry of this system is trigonal bipyramid (Fig. 2), except from compounds having three 3-center 4-electron (3c-4e) bonds which have tetragonal bipyramid geometry (Fig. 3). The term “geometry” includes positions of ligands and lone electron pairs. The stability of hypervalent compounds is affected by a few factors: electronegativity of ligands, formation of five-membered cyclic structures involving the central atom and the number of electron shells of the central atom. Martin proposed three-symbol notation N-X-L for these structures, which was further modified (Tab. 1). Hypervalent compounds can isomerize according to various mechanisms: Berry pseudorotation (Scheme 1), turnstile rotation (Scheme 2), cuneal inversion (Scheme 3), lever mechanism (Scheme 4), or Bailar twist (Scheme 5). Furthermore, hypervalent structures of 10-X-4 and 10-X-5 type with trigonal bipyramid geometry, C1 or C2 symmetry and at least three different ligands can exist as optically active species (Tab. 2, Fig. 5–7, Scheme 6), especially the "spiro" ones, which are resistant to isomerization. In 1977 Martin and Balthazor proposed extended Cahn-Ingold-Prelog convention for description of the absolute configuration of chiral hypervalent compounds (Fig. 5).
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 5-6; 529-541
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    D-Rybono-1,4-lakton. Część 2, Wykorzystanie w syntezie organicznej – wybrane reakcje
    D-Ribono-1,4-lactone. Part 2, Use in organic synthesis – selected reactions
    Autorzy:
    Madaj, J.
    Samaszko-Fiertek, J.
    Ślusarz, R.
    Dmochowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/171521.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    D-Rybono-1,4-lakton
    C-glikozydy
    analogi nukleozydów
    neplanocyna
    D-ribono-1,4-lactone
    C-glycosides
    nucleosides analogs
    neplanocin
    Opis:
    There are many examples of syntheses with d-ribono-1,4-lactone as a substrate. Among all, its biggest advantage is undoubtedly its accessibility. It can be synthesized on a large scale from naturally available raw materials. Its characteristic feature is the stable configuration of individual carbon atoms in multiple reaction conditions. Very important is the presence of a carbonyl moiety, allowing for a variety of additions which is crucial for carbon-carbon bond formation, the most difficult synthesis in organic chemistry. In this article we present selected examples of articles that were published after 1984. In this year, the second article describing the Use of d-Ribonolactone in Organic Synthesis [36] was published. After this time many articles describing the use of the entitled lactone as a substrate in organic synthesis were published. We thought it would be worthwhile to present in Polish a selection of them. C-Glycosides and nucleoside analogs are a particularly important type of synthesized products. Examples of their synthesis are presented in this work, namely, neplanocin A [5], B [31] and F [24], citreovirdin [14], 2-bromopyridin α- and β-d-ribofuranosides [10], 4-deazaformicin A [27] and varitriol [ 33].
    Źródło:
    Wiadomości Chemiczne; 2017, 71, 11-12; 861-885
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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