Biocatalytic access to nonracemic γ-oxo esters via stereoselective reduction using ene-reductases
作者:Nikolaus G. Turrini、Răzvan C. Cioc、Daan J. H. van der Niet、Eelco Ruijter、Romano V. A. Orru、Mélanie Hall、Kurt Faber
DOI:10.1039/c6gc02493a
日期:——
The asymmetric bioreduction of [small alpha],[small beta]-unsaturated [gamma]-keto esters usingene-reductasesfrom the OldYellowEnzymefamily proceeds with excellent stereoselectivity and high conversion levels, covering a broad range of acyclic and...
Application of enzymic Baeyer–Villiger oxidations of 2-substituted cycloalkanones to the total synthesis of (R)-(+)-lipoic acid
作者:Brian Adger、M. Teresa Bes、Gideon Grogan、Ray McCague、Sandrine Pedragosa-Moreau、Stanley M. Roberts、Raffaella Villa、Peter W. H. Wan、Andew J. Willetts
DOI:10.1039/c39950001563
日期:——
Oxidation of ketones 1aâh using a monooxygenase from Pseudomonas putida NCIMB 10007 gave the lactones 2aâh in optically active form: lactone 2h was converted into (R)-(+)-lipoic acid 9.
Scope of the Asymmetric Intramolecular Stetter Reaction Catalyzed by Chiral Nucleophilic Triazolinylidene Carbenes
作者:Javier Read de Alaniz、Mark S. Kerr、Jennifer L. Moore、Tomislav Rovis
DOI:10.1021/jo702313f
日期:2008.3.1
A highly enantioselective intramolecular Stetter reaction of aromatic and aliphatic aldehydes tethered to different Michael acceptors has been developed. Two triazolium scaffolds have been identified that catalyze the intramolecular Stetter reaction with good reactivity and enantioselectivity. The substrate scope has been examined and found to be broad; both electron-rich and -poor aromatic aldehydes
A Highly Enantioselective Catalytic Intramolecular Stetter Reaction
作者:Mark S. Kerr、Javier Read de Alaniz、Tomislav Rovis
DOI:10.1021/ja027411v
日期:2002.9.1
A family of chiral triazolium salts has been developed for inducing the asymmetric intramolecular Stetter reaction. The use of an aminoindanol-derived catalyst affords optimal results, with the product keto esters formed in 82-97% ee and very good chemical yield. Aromatic and aliphatic aldehydes are equally competent substrates for this reaction. The reaction conditions are reasonably mild and allow the isolation of the newly formed stereocenter without epimerization, although the presumed carbenic intermediates are strong bases.