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Paper | Regular issue | Vol 43, No. 4, 1996, pp.767-774
Published online, 1st January, 1970
DOI: 10.3987/COM-95-7307
Regioselective Synthesis of Thiopyrano[2,3-b][1]benzopyran-5(2H)-ones

Krishna C. Majumdar* and Gour H. Jana

*Department of Chemistry, University of Kalyani, Kalyani-741 235, W. B., India

Abstract

A number of thiopyrano[2,3-b][1]benzopyran-5(2H)-ones (5a-g) have been regioselectively synthesised in 65-82% yields from 4-propynyloxycoumarins (8a-g) through thionation followed by sigmatropic rearrangement.