SYNTHESIS OF FLUORENE- AND SPIROBIFLUORENE-FUSED THIOPHENES

[摘要]：A novel synthetic route to fluorene- and spirobifluorene-fused thiophenes is explored by starting with ninhydrin. The Die Is-Alder cycloaddition was employed to construct the key intermediate, 2,3-bis(hydroxymethyl)-1,4-diphenyl-fluorenone, which was further converted stepwise to the target molecules. All of dihydrothiophenes and final products are confirmed by H-1 NMR, C-13 NMR and mass spectrometry.

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