Tetrahedron Letters p. 2115 - 2117 (2002)
Update date:2022-08-25
Topics:
Majumdar
Ghosh
Hitherto unreported 2H-thiopyrano[3,2-c][1]benzopyran-5-ones 6a-f are synthesized regioselectively in 79-85% yields by the thio-Claisen rearrangement of 4-propargylthio[1]benzopyran-2-ones 5a-f. The substrates 5a-f are synthesized by alkylation of hithert
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