Stereospecific Consecutive Epoxide Ring Expansion with Dimethylsulfoxonium Methylide
作者:Ekaterina D. Butova、Anastasiya V. Barabash、Anna A. Petrova、Christian M. Kleiner、Peter R. Schreiner、Andrey A. Fokin
DOI:10.1021/jo101330p
日期:2010.9.17
Consecutive ring-expansion reactions of oxiranes with dimethylsulfxonium methylide were studied experimentally and modeled computationally at the density functional theory (DFT) and second-order Møller−Plesset (MP2) levels of theory utilizing a polarizable continuum model (PCM) to account for solvent effects. While the epoxide to oxetane ring expansion requires 13−17 kcal mol−1 activation and occurs
The regioselective Heck arylation of unsaturated alcohols is utilized as the key step in a convenient one-pot procedure for the production of 2,2-disubstituted tetrahydrofurans and tetrahydropyrans. The arylation reaction is effected with a palladium-diphosphine catalyst alongside a hydrogen bond donor; this is followed by the introduction of a Brønsted acid to the reaction mixture, affording the oxygen heterocycles in moderate yields.