Hypervalent Iodine Chemistry: New Oxidation Reactions Using the Iodosylbenzene−Trimethylsilyl Azide Reagent Combination. Direct α- and β-Azido Functionalization of Triisopropylsilyl Enol Ethers
作者:Philip Magnus、Jérôme Lacour、P. Andrew Evans、Michael B. Roe、Christopher Hulme
DOI:10.1021/ja953906r
日期:1996.1.1
Treatment of triisopropylsilyl (TIPS) enolethers with PhIO/TMSN3/at −18 to −15 °C rapidly (5 min) gave β-azido TIPS enolethers in high yields, with only traces of the α-azido adduct. The reaction...
Catalytic [3+2] Annulation of Aminocyclopropanes for the Enantiospecific Synthesis of Cyclopentylamines
作者:Florian de Nanteuil、Jérôme Waser
DOI:10.1002/anie.201106255
日期:2011.12.9
With nitrogen too: The first catalytic [3+2] annulation of aminocyclopropanes with enol ethers is reported (see scheme; Phth=phthaloyl). The reaction worked with easily accessible phthalimidocyclopropanes using 5 mol % of SnCl4 in nearly quantitative yields. Polysubstituted cyclopentylamines, which are often present in bioactive compounds, were obtained with high diastereoselectivity and enantiospecificity
Rapid assembly of stereochemically rich polycyclic tetrahydrofurans by a conjugate addition-Rh(II) catalysis sequence
作者:Evan M. Howard、Avery M. Peck、Isabelle E. Petrucci、Matthias Brewer
DOI:10.1016/j.tetlet.2022.154137
日期:2022.10
efficient reaction sequence that gives stereochemically rich, polycyclic tetrahydrofurans is described. A highly diastereoselective conjugate addition of enoxy silanes to vinyl diazonium salts gives 2-diazo-1,5‑dicarbonylcompounds in yields up to 99%. The diazo functional group can then be taken advantage of in subsequent Rh catalyzed carbonyl ylide 1,3-dipolar cycloaddition or OH insertion reactions to