An iodine‐mediated oxidative ring contraction of cyclobutanols has been developed. The reaction allows the synthesis of a wide range of aryl cyclopropyl ketones under mild and eco‐friendly conditions. A variety of functional groups including aromatic or alkyl halides, ethers, esters, ketones, alkenes, and even aldehydes are nicely tolerated in the reaction. This is in contrast with traditional synthetic
A Hypervalent Iodide-Initiated Fragment Coupling Cascade of N-Allylhydrazones
作者:Kelly E. Lutz、Regan J. Thomson
DOI:10.1002/anie.201100888
日期:2011.5.2
Highway to the hydrazone: A hypervalent iodide initiated cascade process enables the rapid union of an aldehyde, an allylic hydrazide, and an alcohol (see scheme; Pv=pivaloyl). This process affords a diverse range of functionalized ether adducts, while simultaneously generating a stereodefined alkene and two new vicinal stereocenters. The use of chiral non‐racemic hydrazines and alcohols offers a rapid
Stereocontrolled Syntheses of Tetralone- and Naphthyl-Type Lignans by a One-Pot Oxidative [3,3] Rearrangement/Friedel-Crafts Arylation
作者:Jordan C. T. Reddel、Kelly E. Lutz、Abdallah B. Diagne、Regan J. Thomson
DOI:10.1002/anie.201307659
日期:2014.1.27
The development of a stereoselective one‐pot oxidative [3,3] sigmatropic rearrangement/Friedel–Craftsarylation that provides enantioenriched benzhydryl compounds is reported. The utility of this new transformation is demonstrated by the concise synthesis of several tetralone‐ and naphthyl‐type lignan natural products, many of which display anti‐malarial activity.
Diverse Reactions of PhI(OTf)<sub>2</sub> with Common 2-Electron Ligands: Complex Formation, Oxidation, and Oxidative Coupling
作者:Thomas P. Pell、Shannon A. Couchman、Sara Ibrahim、David J. D. Wilson、Brian J. Smith、Peter J. Barnard、Jason L. Dutton
DOI:10.1021/ic302176f
日期:2012.12.3
The crystal structures of bis-pyridine stabilized iodine dications [PhI(pyr)2]2+ are reported as triflate salts, representing the first ligand supported iodine dications to be structurally characterized. The pyridine complexes are susceptible to ligand exchange in reaction with stronger N-based donors such as 4-dimethylaminopyridine. Attempts to extend this reactivity to N-heterocyclic carbene and