Eclectic 1-Aryl-1,2-diazabuta-1,3-dienes: Valuable Tools for the Preparation of Pyrrol-2-ones, 1-Arylpyrazoles, 2-(3-Oxopyrazol-4-yl)malonates and 4-(2-Oxopyrrol-3-yl)pyrazol-3-ones
作者:Paolino Filippone、Orazio A. Attanasi、Lucia De Crescentini、Gianfranco Favi、Fabio Mantellini、Stefania Santeusanio
DOI:10.1055/s-2002-33334
日期:——
1-Aryl-1,2-diazabuta-1,3-dienes react with dimethyl malonate to give hydrazonic intermediates that in turn are converted into pyrrol-2-ones, 1-arylpyrazoles and 2-(3-oxopyrazol-4-yl)malonates. The latter compounds represent an useful entry to 4-(2-oxopyrrol-3-yl)pyrazol-3-ones, by means of the addition of another molecule of 1,2-diazabuta-1,3-diene and subsequent cyclization of the adducts.
1-芳基-1,2-二氮杂丁二烯与二甲基丙二酸酯反应生成腙中间体,这些中间体进而转化为吡咯-2-酮、1-芳基吡唑和2-(3-氧代吡唑-4-基)丙二酸酯。后一类化合物通过另一分子1,2-二氮杂丁二烯的添加及随后加合物的环化,可用于合成4-(2-氧代吡咯-3-基)吡唑-3-酮。