new Mannichbasesderivedfrom ortho-hydroxyacetophenones and containing pyrazoles as amine moieties have been subjected to oximation in alkaline medium. The selective acetylation to the oximino hydroxyl of the resulting oximes led to the corresponding oxime-acetates. These have been transformed via a ring closure reaction in refluxing benzene and in the presence of anhydrous K2CO3 into 3-(2-(1-pyrazolyl)ethyl)-1
四种从邻羟基苯乙酮衍生并含有吡唑作为胺基的新曼尼希碱已在碱性介质中进行了肟化反应。所得肟的肟基肟的选择性乙酰化反应生成相应的肟乙酸酯。这些已通过在回流的苯中的闭环反应并在无水K 2 CO 3的存在下转化成3-(2-(1-吡唑基)乙基)-1,2-苯并恶唑,其作为潜在的药理学相关化合物是有价值的。
Synthesis and Reactivity of Mannich Bases. XVIII. Reaction of Dithiocarbamic Acid Salts With Mannich Bases Derived from <i>Ortho</i>-Hydroxyacetophenones
The reaction of Mannichbases derived from ortho-hydroxyacetophenones with N,N-dialkyldithiocarbamic acid salts result in the formation of the corresponding dithiocarbamic acid esters via an amine moiety replacement when the process is conducted in cold water. Attempts to carry out the synthesis in refluxing ethanol-water mixture led to the insertion of carbon sulfide at the C—N bond in Mannich bases