STUDIES IN SIGMATROPIC REARRANGEMENT: REGIOSELECTIVE SYNTHESIS OF THIENO[2,3-<i>b</i>]- THIOCHROMEN-4-ONE DERIVATIVES
作者:K. C. Majumdar、S. K. Ghosh
DOI:10.1081/scc-120003620
日期:2002.1
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.