Application of Ynamides in the Synthesis of 2-(Tosylamido)- and 2,5-Bis(tosylamido)thiophenes
作者:Imen Talbi、Carole Alayrac、Jean-François Lohier、Soufiane Touil、Bernhard Witulski
DOI:10.1021/acs.orglett.6b01101
日期:2016.6.3
A step-economic and metal-catalyst-free synthesis of 2-(tosylamido)- and 2,5-bis(tosylamido)-thiophenes from nonsymmetrical 1,3-butadiynamides and symmetrical 1,3-butadiyne-1,4-diamides is reported. The reaction proceeds in the presence of Na2S·9H2O (2–3 equiv) under mild reaction conditions (50 °C) and is facilitated by polarized carbon–carbon triple bonds in ynamides. This new approach to thiophenes
由非对称的1,3-丁二炔酰胺和对称的1,3-丁二炔-1,4-二酰胺逐步合成2-(甲苯磺酰胺基)-和2,5-双(甲苯磺酰胺基)-噻吩的经济且无金属催化剂的方法是报告。该反应在温和的反应条件(50°C)下在Na 2 S·9H 2 O(2-3当量)存在下进行,并且通过酰胺中的碳-碳三键极化促进了反应。这种基于乙酰胺化学的噻吩新方法被用于合成双(甲苯磺酰胺基)封端的对噻吩,该对噻吩在高π共轭分子框架中嵌入了一串N,S-杂原子。