Highly Stereoselective Synthesis of trans-4-Trifluoromethylsulfonyl-2,3-dihydrofurans from Arsonium Ylides and (E)-α-Trifluoromethylsulfonyl-α,β-unsaturated Ketones.

The reaction tolerates a wide range of functional groups at the arsonium ylides and a variety of aromatic and furanyl substituents at the α,β-unsaturated ketones and proceeds with complete stereoselectivity.

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