FromN-Substituted Thioamides to Symmetrical and Unsymmetrical 3,4,5-Trisubstituted 4H-1,2,4-Triazoles: Synthesis and Characterisation of New Chelating Ligands
作者:Marco H. Klingele、Sally Brooker
DOI:10.1002/ejoc.200400184
日期:2004.8
improved protocol for the synthesis of N-substituted pyridine-2-thiocarboxamides under the conditions of the Willgerodt−Kindler reaction, employing a catalytic amount of sodium sulfide nonahydrate, has been developed. Following this protocol, eight thioamides carrying aromatic or aliphatic N-substituents have been prepared in good to excellent yields. Condensation of these thioamides or their S-alkylated
已经开发了在 Willgerodt-Kindler 反应条件下合成 N-取代吡啶-2-硫代甲酰胺的改进方案,使用催化量的硫化钠九水合物。按照该协议,八种携带芳香族或脂肪族 N 取代基的硫代酰胺已以良好的产率制备。这些硫代酰胺或它们的 S-烷基化同系物在回流的 1-丁醇中与酰肼缩合,以良好的收率得到了八个未稠合的 3,4,5-三取代 4H-1,2,4-三唑,包括四个否则不易获得的例子4-烷基-3,5-二芳基-4H-1,2,4-三唑。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)