Stable and easily available sulfide surrogates allow a stereoselective activation of alcohols
作者:Jérémy Merad、Ján Matyašovský、Tobias Stopka、Bogdan R. Brutiu、Alexandre Pinto、Martina Drescher、Nuno Maulide
DOI:10.1039/d1sc01602d
日期:——
Isothiouronium salts are easilyaccessible and stable compounds. Herein, we report their use as versatile deoxasulfenylating agents enabling a stereoselective, thiol-free protocol for synthesis of thioethers from alcohols. The method is simple, scalable and tolerates a broad range of functional groups otherwise incompatible with other methods. Late-stage modification of several pharmaceuticals provides
Chirality Transfer in Gold(I)-Catalysed Hydroalkoxylation of 1,3-Disubstituted Allenes
作者:Stacey Webster、Daniel R. Sutherland、Ai-Lan Lee
DOI:10.1002/chem.201603918
日期:2016.12.19
Gold(I)-catalysed intermolecularhydroalkoxylation of enantioenriched 1,3-disubstituted allenes was previously reported to occur with poor chirality transfer due to rapid allene racemisation. The first intermolecularhydroalkoxylation of allenes with efficient chirality transfer is reported here, exploiting conditions that suppress allene racemisation. A full substrate scope study reveals that excellent
Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly opticallyactive 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available opticallyactive 2,3-allenols. A mechanism for this reaction was proposed.
Stereocontrol in Palladium-Catalyzed Propargylic Substitutions: Kinetic Resolution to give Enantioenriched 1,5-Enynes and Propargyl Acetates
作者:Michael J. Ardolino、Meredith S. Eno、James P. Morken
DOI:10.1002/adsc.201300720
日期:2013.11.25
Kineticresolution during the catalytic allyl-propargyl cross-coupling with chiral starting materials can be accomplished with a chiral Palladium catalyst. These reactions offer ready access to enantiomerically enriched enyne products from simple readily available starting materials.
Studies on highly regio- and stereoselective hydration of 1,2-allenylic sulfoxides
作者:Zhao Fang、Chao Zhou、Chunling Fu、Shengming Ma
DOI:10.1039/c0ob00007h
日期:——
A highlyregio- and stereoselective hydration of 1,2-allenylicsulfoxides in which proton served as the electrophile was reported. Through the X-ray diffraction study, it was concluded that the reaction may proceed via a 5-membered cyclic intermediate following by attack of the −OH at the sulfur atom.