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 methylgroup under modified Gewald conditions selectively