Palladium-Catalyzed Divergent Synthesis from <i>o</i>-Sulfonamido Trifluoroacetophenones and 2-En-4-ynyl Carbonates

Here we present a palladium-catalyzed divergent transformative reaction between <i>o-</i>sulfonamido trifluoroacetophenones and 2-en-4-ynyl carbonates. A spectrum of enantioenriched 2,5-dihydrofuran-fused tetrahydroquinolines bearing either a (<i>Z</i>)- or (<i>E</i>)-exocyclic double bond are constructed with moderate to high enantioselectivity from 5-aryl-substituted carbonates by tuning palladium sources, while analogous 2,3-dihydrofuran-fused products are furnished by using 5-alkyl-substituted ones.