Vilsmeier Formylation of Hydrazones and Semicarbazones Derived from Alkyl, Benzyl, and Cycloalkyl Methyl Ketones
作者:A. V. Lebedev、A. B. Lebedeva、V. D. Sheludyakov、E. A. Kovaleva、O. L. Ustinova、I. B. Kozhevnikov
DOI:10.1007/s11176-005-0241-y
日期:2005.3
Formylation of ten accessible phenylhydrazones and semicarbazones derived from alkyl, benzyl, and cycloalkyl methyl ketones with the complex of POCl3 with dimethylformamide was studied. Depending on the electronic and steric structure of the substrates, the reaction yields 1-phenyl- or 1-unsubstituted 3,4-dialkyl-, 3-alkyl-4-aryl-, or 3-alkyl-4-formylpyrazoles. These compounds can be readily oxidized
研究了十个可及的苯hydr和半咔唑类化合物(由POCl 3与二甲基甲酰胺形成的配合物)的甲酰基化作用,该苯甲酰基和半咔唑类衍生自烷基,苄基和环烷基甲基酮。根据底物的电子和空间结构,反应产生1-苯基-或1-未取代的3,4-二烷基-,3-烷基-4-芳基-或3-烷基-4-甲酰基吡唑。这些化合物可以容易地氧化成相应的羧酸。