Condensation of 2-alkynyl-1-chloro- and 1-alkynyl-2-chloroanthraquinones with Na 2 S under mild conditions afforded anthra[1,2-b]thiophene-6,11-diones and anthra[2,1-b]thiophene-6,1-diones, respectively. A variety of angular anthrathiophenediones was synthesized by this method. The acetylenic precursors were prepared by a modified procedure of the Sonogashira reaction.
2-炔基-1-
氯-和1-炔基-2-
氯蒽醌与Na 2 S在温和条件下缩合得到
蒽[1,2-b]
噻吩-6,11-二酮和
蒽[2,1-b]
噻吩-6,1-二酮,分别。该方法合成了多种角
蒽噻吩二
酮类化合物。炔属前体通过改进的 Sonogashira 反应程序制备。