Fluoride-Assisted Regioselective Conversion of Functionalized Furans to α-Substituted γ-Hydroxybutenolides Using Singlet Oxygen

2007 
A facile synthesis of α-substituted γ-hydroxybutenolides from 3-furfural was achieved using a Baylis−Hillman reaction followed by singlet oxygen oxidation. The regioselectivity of this conversion was controlled by using TBAF.
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