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Synthesis 2004(13): 2131-2134
DOI: 10.1055/s-2004-829187
DOI: 10.1055/s-2004-829187
PAPER
© Georg Thieme Verlag Stuttgart · New York
A Simple Synthesis of Angular Anthrathiophenediones via Acetylenic Derivatives of Anthraquinone
Further Information
Publication History
Received
24 February 2004
Publication Date:
30 July 2004 (online)


Abstract
Condensation of 2-alkynyl-1-chloro- and 1-alkynyl-2-chloroanthraquinones with Na2S under mild conditions afforded anthra[1,2-b]thiophene-6,11-diones and anthra[2,1-b]thiophene-6,11-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.
Key words
quinones - alkynes - cross-coupling - ring closure - sulfur