POLAR CYCLOADDITION OF α-ACYL-α-CHLOROSULFIDES WITH ALKYNES. NOVEL ONE-STEP SYNTHESES OF FURANS AND 2-FURANONES

Article abstract of DOI:10.1016/S0040-4039(00)94300-4

<3⁺+2> Polar cycloaddition of a α-chloro-α-(methylthio)acetone (1) and methyl α-chloro-α-(methylthio)acetate (2) with alkynes in the presence of Lewis acid afford the furan derivative (4) and the 2-furanone derivative (6 or 8), respectively.