A convenient one-pot preparation of spiro[fluorene-9,9’-xanthene]-3’,6’-diol derivatives

Abstract

Spiro[fluorene-9,9'-xanthene]-3',6'-diol derivatives were prepared via the condensation reaction of fluorenones with resorcinol using p-toluenesulfonic acid as catalyst. A series of substituted spiro[fluorene-9,9'-xanthene]-3',6'-diol derivatives with halogen, alkyl, phenyl, and ester were prepared by this one-pot method in good yield.

One‐Pot Synthesis of Spiro[fluorene‐9,9'‐xanthene] Derivatives

“…In order to overcome this drawback, Zhou performed a series of reactions with varying conditions, including acid, solvent, catalyst, reaction time, temperature, and feed ratio. [ 37 ]…”