An Unexpected Domino Reaction of β-Keto Sulfones with Acetylene Ketones Promoted by Base: Facile Synthesis of 3(2H )-Furanones and Sulfonylbenzenes

An unexpected domino reaction of β-keto sulfones with acetylene ketones has been developed. The domino reaction of β-keto sulfones with diynones proceeded smoothly in the 30% mol K2CO3 without other additives, and afforded the novel 3(2H)-furanone derivatives. Replaced diynones with terminal alkyne ketones, the reaction regioselectivity was changed and sulfonylbenzenes were obtained via the benzannulation in good yields.