Palladium-Catalyzed Conversion of β,γ-Unsaturated Silyl Sulfinates into (<i>E</i>)-Alkenes: Asymmetric Synthesis of Polypropionate Fragments
作者:Xiaogen Huang、Cotinica Craita、Pierre Vogel
DOI:10.1021/jo0357622
日期:2004.6.1
At low temperature, 1-alkoxy-1,3-dienes add to sulfur dioxide activated by a Lewis or protic acid generating zwitterionic intermediates that can be quenched by enoxysilanes. The resulting β,γ-unsaturated silyl sulfinates can be desilylated by 1:1 Pd(OAc)2/PPh3 catalyst, liberating the corresponding β,γ-unsaturated sulfinic acids that undergo smooth and highly stereoselective retro-ene eliminations