Journal
SYNTHETIC COMMUNICATIONS
Volume 32, Issue 8, Pages 1271-1274Publisher
MARCEL DEKKER INC
DOI: 10.1081/SCC-120003620
Keywords
Claisen rearrangement; [3,3]sigmatropic rearrangement; acid catalysis; thieno[2,3-b]thiochromen-4-one; 4-toluene sulfonic acid
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Thermal rearrangement of a number of 2-(4'-aryloxybut-2'-ynylthio)-thiochromen-4-ones in refluxing chlorobenzene in the presence of catalytic amounts of 4-toluenesulfonic acid afforded 3-aryloxymethyl-2-methylthieno[2,3-b]thiochromen-4-ones in 55-62% yields.
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