Synthesis of Novel 2-Aminothiophene-3-carboxylates by Variations of the Gewald Reaction
作者:Hans-Peter Buchstaller、Carsten D. Siebert、Ralf H. Lyssy、Ina Frank、Adil Duran、Rudolf Gottschlich、Christian R. Noe
DOI:10.1007/s007060170137
日期:2001.2.15
compounds through variations of the Gewald reaction is presented. Knoevenagel condensation of methylketone derivatives with methyl cyanoacetate and subsequent treatment of the α,β-unsaturated nitriles with sulfur and amine resulted in the corresponding 2-aminothiophenes 5 or isomers 9 and 10 . Reaction of methylketone derivatives bearing a leaving group at the methyl group under modified Gewald conditions selectively
介绍了通过 Gewald 反应的变化合成标题化合物的方法 。 甲基酮衍生物与氰基乙酸甲酯的 Knoevenagel 缩合,然后用硫和胺处理α,β-不饱和腈,得到相应的2-氨基噻吩 5 或异构体 9 和 10 。在修饰的 Gewald 条件下,在甲基上带有离去基的甲基酮衍生物的反应 选择性地导致4-取代的2-氨基噻吩 9a 和 12的形成 。硫原子的引入是通过硫化钠的亲核取代而发生的。