Stereoretentive Olefin Metathesis Made Easy: In Situ Generation of Highly Selective Ruthenium Catalysts from Commercial Starting Materials
作者:Daniel S. Müller、Idriss Curbet、Yann Raoul、Jérôme Le Nôtre、Olivier Baslé、Marc Mauduit
DOI:10.1021/acs.orglett.8b02943
日期:2018.11.2
The in situ preparation of highly stereoretentive ruthenium-based metathesiscatalysts is reported. This approach completely avoids the isolation of intermediates and air-sensitive catalysts, thus allowing for the rapid access and evaluation of numerous dithiolate Ru catalysts. A procedure was established to perform cross-metathesis reactions without the use of a glovebox, and on a small scale even
Enantioselective Synthesis of Bicyclo[6.1.0]nonane-9-carboxylic Acids via Me<sub>2</sub>AlOTf-Promoted Intramolecular Friedel−Crafts Alkylation of Arenes with the γ-Lactone Moiety of 3-Oxabicyclo[3.1.0]hexan-2-ones
作者:Eric Fillion、Rachel L. Beingessner
DOI:10.1021/jo0351419
日期:2003.11.1
acids via Me2AlOTf-promoted intramolecularFriedel-Craftsalkylation of tethered pi-nucleophiles with the gamma-lactone moiety of 3-oxabicyclo[3.1.0]hexan-2-ones is described. The approach begins with the enantioselective synthesis of 3-oxabicyclo[3.1.0]hexan-2-ones bearing a tethered pi-nucleophile at the 6-position by intramolecular Rh(II)-catalyzed cyclopropanation of allylic diazoacetates, prepared
Hydrocarbon Oxidation vs C−C Bond-Forming Approaches for Efficient Syntheses of Oxygenated Molecules
作者:Kenneth J. Fraunhoffer、Daniel A. Bachovchin、M. Christina White
DOI:10.1021/ol047800p
日期:2005.1.1
[Reaction: see text] A hydrocarbon oxidation approach has been applied to the construction of several linear (E)-allylic alcohols that have served as intermediates in the synthesis of natural products and natural product-like molecules. In the original syntheses, these intermediates were constructed using a standard Wittig-type olefination approach. We report here that routes to these same intermediates
catechodithiolate ruthenium complexes containing cyclic(alkyl)(amino)carbene ligands are reported. Isolated in nearly quantitative yields or in situ generated, these catalysts demonstrated remarkable Z selectivity (Z/E ratio up to >98/2) in ring-opening metathesis polymerization (ROMP), ring-opening-cross metathesis (ROCM) and cross-metathesis (CM). Thanks to the efficient chiral HPLC resolution of