Catalyst-free C–S/C–O bond formation: synthesis of novel 4-thio-substituted 2-aryl-4H-chromenes from easily available 2-hydroxychalcones

An efficient catalyst-free synthesis of novel functionalized 4-thio-substituted 2-aryl-4H-chromenes from easily available 2-hydroxychalcone derivatives is described. This domino reaction enables successful assembly of two new C–S and C–O sigma bonds in a one-pot operation.

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