[3 + 2]-Annulation Reactions of Chiral Allylsilanes and Chiral Aldehydes. Studies on the Synthesis of Bis-tetrahydrofuran Substructures of Annonaceous Acetogenins
作者:Eric Mertz、Jennifer M. Tinsley、William R. Roush
DOI:10.1021/jo0511290
日期:2005.9.1
Double asymmetric [3 + 2]-annulation reactions of chiral β-silyloxyallylsilanes with chiral 2-tetrahydrofuranyl carboxaldehydes have been studied, leading to the stereocontrolled synthesis of six diastereomeric bis-tetrahydrofuran structures corresponding to the core subunits of members of the Annonaceous acetogenin family of natural products. Transition-state models are proposed to account for the
Common-Intermediate Strategy for Synthesis of Conduritols and Inositols via β-Hydroxy Cyclohexenylsilanes
作者:Jung-Nyoung Heo、Edward B. Holson、William R. Roush
DOI:10.1021/ol034349d
日期:2003.5.1
[GRAPHICS]Syntheses of conduritols B-D and F and (D)-(+)-chiro- and neo-inositols from cyclohexenyl si lane intermediates are described. The key cyclohexylsilane intermediates 5 and 14 were synthesized by stereoselective olefin dihydroxylation of the corresponding cyclohexenylsilanes. Selective Peterson elimination reactions and Fleming-Tamao oxidations of 5 and 14 then delivered the targeted cyclitol derivatives.
Enantio- and Diastereoselective Synthesis of Cyclic β-Hydroxy Allylsilanes via Sequential Aldehyde γ-Silylallylboration and Ring-Closing Metathesis Reactions
作者:Jung-Nyoung Heo、Glenn C. Micalizio、William R. Roush
DOI:10.1021/ol034347t
日期:2003.5.1
[GRAPHICS]Highly enantioenriched cyclic allylsilanes are prepared via stereoselective gamma-silylallylboration reactions of beta- or gamma-unsaturated aldehydes followed by ring-closing metathesis.
[(E)-γ-(Dimethylphenylsilyl)allyl]diisopinocampheylborane: a highly enantioselective reagent for the synthesis of anti-β-hydroxyallylsilanes
作者:William R Roush、Anatoly N Pinchuk、Glenn C Micalizio
DOI:10.1016/s0040-4039(00)01526-4
日期:2000.12
anti-beta -Hydroxyallylsilanes are prepared with 88-95% e.e. via the asymmetric allylboration reactions of aldehydes and [(E)-gamma-(dimethylphenylsilyl)allyl]diisopinocampheylborane (7) (C) 2000 Published by Elsevier Science Ltd.