Preparation of 3,4-Substituted-5-Aminopyrazoles and 4-Substituted-2-Aminothiazoles
作者:Stepan Havel、Prashant Khirsariya、Naresh Akavaram、Kamil Paruch、Benoit Carbain
DOI:10.1021/acs.joc.8b02655
日期:2018.12.21
3,4-Substituted-5-aminopyrazoles and 4-substituted-2-aminothiazoles are frequently used intermediates in medicinal chemistry and drug discovery projects. We report an expedient flexible synthesis of 3,4-substituted-5-aminopyrazoles (35 examples), based on palladium-mediated α-arylation of β-ketonitriles with aryl bromides. A library of 4-substituted-2-aminothiazoles (21 examples) was assembled by a
3,4-取代的5-氨基吡唑和4-取代的2-氨基噻唑是药物化学和药物开发项目中经常使用的中间体。我们报道了基于钯介导的β-酮腈与芳基溴化物的α-芳基化反应的3,4-取代的5-氨基吡唑类化合物的便捷合成(35个例子)。通过使用新制备的,适当保护的4-硼酸-2-氨基噻唑的频哪醇酯和MIDA酯与(杂)芳基卤化物的Suzuki偶联的序列,组装4-取代的2-氨基噻唑的文库(21个实例)。