Sulfur Dioxide Mediated One-Pot, Three- and Four-Component Syntheses of Polyfunctional Sulfonamides and Sulfonic Esters: Study of the Stereoselectivity of the Ene Reaction of Sulfur Dioxide
作者:Laure C. Bouchez、Srinivas Reddy Dubbaka、Māris Turks、Pierre Vogel
DOI:10.1021/jo049047j
日期:2004.9.1
The enereaction of sulfurdioxide with enoxysilanes or with allylsilanes generates silyl sulfinates that can be brominated (Br2 or NBS) or chlorinated (NCS or Cl2) to produce the corresponding sulfonyl halides. They react with primary and secondary amines or alcohols to give the corresponding sulfonamides and sulfonic esters, respectively. The hetero-Diels−Alder addition of sulfurdioxide to 1-oxy-
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
One-Pot, Four-Component Synthesis of Polyfunctional Sulfones
作者:Pierre Vogel、Xiaogen Huang
DOI:10.1055/s-2002-19798
日期:——
dioxide precomplexed with ytterbium triflate or (CF3SO2)(2)NH generates sulfinate intermediates that can be quenched by a variety of electrophiles to afford the corresponding polyfunctional sulfones in one-pot operations.
Total Synthesis of Polypropionate Natural Products: Application of New Sulfur Dioxide Chemistry
作者:C. Craita、L. Bouchez、M. Turks、X. Huang、F. Fonquerne、M. C. Murcia、P. Vogel
DOI:10.1080/10426500590910828
日期:2005.3.2
Abstract In the presence of a Lewis or protic acid at low temperature, electron-rich dienes add to sulfur dioxide and carbon nucleophiles generating silyl sulfinates. The latter can be transformed into valuable polyketide precursors.
Sulfur Dioxide-Mediated Syntheses of Polyfunctional Alkenes and (<i>E</i>,<i>Z</i>)- and (<i>E</i>,<i>E</i>)-2,4-Dien-1-ones
作者:Laure C. Bouchez、Cotinica Craita、Pierre Vogel
DOI:10.1021/ol050006z
日期:2005.3.1
Efficient methods for the stereoselective synthesis of polyfunctional (E)- and (Z)-alkenes and conjugated (E,E)- and (E,Z)-dienones are presented. They rely upon one-pot, four-component processes that condense 1-oxy-1,3-dienes, silyl enol ethers, SO2, and carbon electrophiles. [structure: see text]