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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 929-934 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic Dicarboxylic Acid Esters, I. Synthesis and Reactivity of 2-Methyl-3,4-dihydro-ZH-pyrano[2,3-d]pyridazines6-Methyl-2,3-bis(methoxycarbonyl)-5,6-dihydro-4H-pyrane (2a) reacts with hydrazine to give the dihydrazid 3 which can be converted to 2-niethyl-3,4,5,6,7,8-hexahydro-2H-pyrano [2,3-d]-pyridazine-5,8-dione (4) under elimination of hydrazine. Treatment of 4 with POCl3/pyridine yields the 5,8-dichloropyranopyridazine 5. The reactivity of this compound to nucleophilic agents is studied and discussed. I. r. and n. m. r. data are given.
    Notes: 6-Methyl-2,3-bis(methoxycarbonyl)-5,6-dihydro-4H-pyran (2a) setzt sich mit Hydrazinhydrat zum Dihydrazid 3 um, welches unter Hydrazinabspaltung in das 2-Methyl-3,4,5,6,7,8-hexahydro-2H-pyrano[2,3-d]pyridazin-5,8-dion (4) übergeht. Durch Behandlung von 4 mit POCl3/Pyridin erhält man das 5,8-Dichlorpyranopyridazin 5, dessen Reaktivität gegenüber nucleophilen Agentien untersucht und diskutiert wird. Die IR- und NMR-Daten der erhaltenen Verbindungen werden aufgeführt.
    Type of Medium: Electronic Resource
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