mixtures of isomers and substantial polymerization. The reaction took place under exceptionally mild reaction conditions and very low catalyst loading (0.5 mol %). DFT calculations disclose the mechanistic features of the isomerization and account for the high selectivity displayed by the B(C6 F5 )3 catalyst. The synthetic applicability of the newreaction is demonstrated by the preparation of γ-chiral
METHOD FOR PRODUCING OLEFINICALLY UNSATURATED CARBONYL COMPOUNDS BY OXIDATIVE DEHYDROGENATION OF ALCOHOLS
申请人:Limbach Michael
公开号:US20110004025A1
公开(公告)日:2011-01-06
A process for preparing olefinically unsaturated carbonyl compounds by oxidative dehydrogenation in an oxygenous atmosphere over a supported catalyst which comprises gold and optionally further noble metals at temperatures in the range from 50 to 240° C.
Palladium-Catalyzed Enantioselective Redox-Relay Heck Arylation of 1,1-Disubstituted Homoallylic Alcohols
作者:Zhi-Min Chen、Margaret J. Hilton、Matthew S. Sigman
DOI:10.1021/jacs.6b06994
日期:2016.9.14
An enantioselective redox-relay oxidative Heck arylation of 1,1-disubstituted alkenes to construct β-stereocenters was developed using a new pyridyl-oxazoline ligand. Various 1,2-diaryl carbonyl compounds were readily obtained in moderate yield and good to excellent enantioselectivity. Additionally, analysis of the reaction outcomes using multidimensional correlations revealed that enantioselectivity
Copper-catalyzed enantioselective 1,2-borylation of 1,3-dienes
作者:Yangbin Liu、Daniele Fiorito、Clément Mazet
DOI:10.1039/c8sc01538d
日期:——
borylation of 2-substituted 1,3-dienes is reported. The use of a chiral phosphanamine ligand is essential in achieving high chemo-, regio-, diastereo- and enantioselectivity. It provides access to a variety of homoallylic boronates in consistently high yield and enantiomeric excess with 2-aryl and 2-heteroaryl 1,3-dienes as well as sterically demanding 2-alkyl 1,3-dienes. Preliminary investigations
Nickel‐Catalyzed Enantioselective Reductive Alkyl‐Carbamoylation of Internal Alkenes
作者:Xianqing Wu、Aneta Turlik、Baixue Luan、Feng He、Jingping Qu、K. N. Houk、Yifeng Chen
DOI:10.1002/anie.202207536
日期:2022.9.5
The enantioselective reductive dicarbofunctionalization of internalalkenes has been developed to enable the formation of vicinal stereogenic centers. This protocol allows for facile synthesis of chiral pyrrolidinones bearing vicinal or quaternary stereocenters with excellent enantio- and diastereoselectivities. DFT calculations suggest that the enantiodetermining step is intramolecular migratory insertion