1 Ocak 2013 Dergi makalesi Açık Erişim

Koza, Gani; Keskin, Selbi; Ozer, Merve Sinem; Cengiz, Betul; Sahin, Ertan; Balci, Metin

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    <subfield code="a">Facile synthesis of novel 7-aminofuro- and 7-aminothieno[2,3-d]pyridazin-4(5H)-one and 4-aminophthalazin-1(2H)-ones</subfield>
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    <subfield code="a">We hereby report the synthesis of a novel class of compounds, 7-aminofuro- and 7-aminothieno[2,3-d]pyridazin-4(5H)-one and 4-aminophthalazin-1(2H)-ones starting from methyl 2-(2-methoxy-2-oxoethyl)furan- and thiophene-3-carboxylate and methyl 2-(2-methoxy-2-oxoethyl)benzoate. The ester functionalities connected directly to the aromatic ring were regiospecifically converted to the acid, whereas methylene groups were oxidized to the corresponding ketoesters. Reaction of the ketoesters with hydrazine provided the hydrazone derivatives. An intramolecular cyclization in the presence of thionyl chloride formed a fused pyridazinone skeleton. Hydrolysis of the remaining ester groups and transformation of the acid functionalities to the acyl azides followed by Curtius rearrangement gave the isocyanates. Reaction of the isocyanates with methanol and water produced urethane and amino-pyridazinone derivatives, respectively. (C) 2012 Elsevier Ltd. All rights reserved.</subfield>
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    <subfield code="u">Middle E Tech Univ, Dept Chem, TR-06800 Ankara, Turkey</subfield>
    <subfield code="a">Ozer, Merve Sinem</subfield>
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