A simple and expedient method for the synthesis of ethyl 3-amino-4,6-diarylthieno[2,3-<i>b</i>]pyridine-2-carboxylate
作者:Hetal C. Shah、Vaishali H. Shah、Nirmal D. Desai
DOI:10.1002/jhet.237
日期:2009.11
2‐Chloro‐4,6‐diarylnicotinonitrile 1 was reacted with ethyl 2‐mercaptoacetate 2 to furnish ethyl 2‐(3‐cyano‐4,6‐diarylpyridin‐2‐ylthio)acetate 3 as intermediates. These intermediates were cyclized by Thorpe–Zeigler cyclization using solid–liquid phase‐transfer catalysis conditions to give ethyl 3‐amino‐4,6‐diarylthieno[2,3‐b]pyridine‐2‐carboxylate 4. One‐pot heterocyclization without isolating the
2-氯-4,6- diarylnicotinonitrile 1用2-巯基乙酸乙酯进行反应2至配料中的2-(3-氰基-4,6- diarylpyridin -2-基硫基)乙酸甲酯3作为中间体。这些中间体通过固-液相转移催化条件通过Thorpe–Zeigler环化环化,得到3-氨基-4-6,6-二芳基噻吩并[2,3 - b ]吡啶-2-羧酸乙酯4。使用固液相转移条件也可以实现不分离中间体的单锅杂环。J.杂环化学,(2009)。