Ir-Catalyzed Oxidative Desymmetrization of meso-Diols
摘要:
The catalytic oxidative desymmetrization of meso-diols was realized using a chiral iridium catalyst. In particular, the reaction is effective for the cyclic diols to give the corresponding hydroxy ketones in high chemical yields with high ee's. With this reaction as a key step, a short-step synthesis of common intermediate of ottelione and scyphostatin was achieved.
Chiral Ru(salen)(nitrosyl) complex 1 is a useful catalyst for asymmetric aerobic oxidation of alcohols under photo-irradiation. In this study, it was found that addition of β-hydroxy ketone or 1,3-diketone had a significant influence on its asymmetric catalysis. For example, the addition of 1,3-bis(p-bromophenyl)propane-1,3-dione 9 improved the relative reaction ratio in kinetic resolution of simple
Enantioselective Synthesis of 6,6-Disubstituted Pentafulvenes Containing a Chiral Pendant Hydroxy Group
作者:Ryan Nouch、Melchior Cini、Marc Magre、Mohammed Abid、Montserrat Diéguez、Oscar Pàmies、Simon Woodward、William Lewis
DOI:10.1002/chem.201704247
日期:2017.12.6
Simple enantioselective synthesis of 6,6‐disubstituted pentafulvenes bearing chiral pendant hydroxy groups are attained by cascade reactivity using commercially available proline‐based organocatalysts. Condensation of cyclopentadiene with the acetyl function of a 1,2‐formylacetophenone, followed by cyclization of a resulting fulvene‐stabilized carbanion with the formyl group, generates bicyclic chiral
CH-activating oxidative hydroxylation of 1-tetralones and related compounds with high regio- and stereoselectivity
作者:Gheorghe-Doru Roiban、Rubén Agudo、Adriana Ilie、Richard Lonsdale、Manfred T. Reetz
DOI:10.1039/c4cc04925j
日期:——
Mutants of P450-BM3 evolved by directed evolution are excellent catalysts in the CH-activating oxidative hydroxylation of 1-tetralone derivatives and of indanone, with unusually high regio- and enantioselectivity being observed.
[EN] INHIBITORS OF MENAQUINONE BIOSYNTHESIS<br/>[FR] INHIBITEURS DE LA BIOSYNTHÈSE DE LA MÉNAQUINONE
申请人:MEMORIAL SLOAN KETTERING CANCER CENTER
公开号:WO2017059411A9
公开(公告)日:2017-08-31
Efficient enzymatic kinetic resolution of 4-hydroxytetralone and 3-hydroxyindanone
作者:S. Joly、Mangalam S. Nair
DOI:10.1016/s0957-4166(01)00404-9
日期:2001.9
Both enantiomers of 4-acetoxy- and 4-hydroxytetralone have been obtained with high enantiomeric purity by kinetic resolution using enzymes. 3-Hydroxyindanone was successfully resolved using enzymatic transesterification. The absolute configuration of the products were established by literature precedence. (C) 2001 Published by Elsevier Science Ltd.