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  • 1
    Electronic Resource
    Electronic Resource
    Einfache Synthese substituierter 5,6-Dihydro-2H-pyran-2-one unter milden Bedingungen (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 751-756 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Simple Synthesis of Substituted 5,6-Dihydro-2H-pyran-2-ones under Mild ConditionsThe synthesis of 3,5,5-trisubstituted 5,6-dihydro-2H-pyran-2-ones 5 via Knoevenagel reaction in the presence of TiCl4/pyridine in THF is described.
    Notes: 3,5,5-Trisubstituierte 5,6-Dihydro-2H-Pyran-2-one 5 wurden durch Knoevenagel-Reaktion in THF in Gegenwart von TiCl4/Pyridin synthetisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790603
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Einfache Synthese substituierter 5,6-Dihydro-2H-pyran-2-one unter milden Bedingungen (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 565-568 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Facile Synthesis of Substituted 5,6-Dihydro-2H-pyran-2-ones under Mild ConditionsThe synthesis of the 3,5,5-trisubstituted 5,6-dihydro-2H-pyran-2-ones 3a-k via Knoevenagel reaction in the presence of TiCl4/pyridine in THF is described.
    Notes: Die 3,5,5-trisubstituierten 5,6-Dihydro-2H-pyran-2-one 3a-k wurden durch Knoevenagel-Reaktion in THF in Gegenwart von TiCl4/Pyridin synthetisiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810402
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An Efficient Asymmetric Synthesis of Prostaglandin E1 (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 2655-2662 
    Details
    ISSN: 1434-193X
    Keywords: Prostaglandins ; Asymmetric synthesis ; In situ inversion ; CBS reduction ; Cuprates ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An asymmetric total synthesis of Prostaglandin E1 (5) has been achieved in a two-component coupling process. The chiral hydroxycyclopentenone 6 was readily available from furan with 96% ee. The key reaction step was a kinetic enzymatic resolution followed by an in situ inversion. A catalytic asymmetric reduction of the γ-iodo vinyl ketone 19 with the Corey CBS catalyst gave the ω-side chain 7 with 〉96% ee. Conjugate addition using the reaction with dilithiocyanocuprate followed by mild cleavage of the silyl protective groups and enzymatic hydrolysis of the methyl ester 22 gave (-)-PGE15in high yield.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Über Inhaltsstoffe von Euphorbiaceae, V. Synthese von Calcium-5,5-dimethyl-2-oxo-5,6-dihydro-2 H-pyran-3,4- dicarboxylat (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 923-926 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Constituents of Euphorbiaceae, V. - Synthesis of Calcium 5,5-Dimethyl-2-oxo-5,6-dihydro-2 H-pyrane-3,4-dicarboxylateThis article describes the synthesis of the calium salt of 5,5-dimethyl-2-oxo-5,6-dihydro-2 H-pyrane-3,4-dicarboxylic acid (2) via Knoevenagel condensation of 4,4-dimethyltetrahydro-2,3-furandione (3) with dimethyl malonate in the presence of TiCl4/Pyridine, hydrolysis of the resulting ester 4 to give the anhydride 6, and reaction of 6 with CaCI2.
    Notes: Die Synthese des Calciumsalzes von 5,5-Dimethyl-2-oxo-5,6-dihydro-2 H-pyran-3,4-dicarbonsäure (2) gelingt durch Knoevenagel-Kondensation von 4,4-Dimethyltetrahydro-2,3-furandion (3) mit Malonsäure-dimethylester in Gegenwart von TiCI4/Pyridin, durch Verseifung des dabei erhaltenen Esters 4 zum Anhydrid 6 und dessen Reaktion mit CaCI2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790702
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese substituierter 5,6-Dihydro-2H-pyran-2-one und ihre Umsetzung mit Brom (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 191-195 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Substituted 5,6-Dihydro-2H-pyran-2-ones and their Reaction with BromineThe synthesis of the substituted 5,6-dihydro-2H-pyran-2-ones 2a-f and the reaction of 2a-e and 1g with bromine to 3a-f are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820120
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    Paper (German National Licenses)
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