Catalytic Asymmetric SiO Coupling of Simple Achiral Silanes and Chiral Donor-Functionalized Alcohols
作者:Andreas Weickgenannt、Marius Mewald、Thomas W. T. Muesmann、Martin Oestreich
DOI:10.1002/anie.200905561
日期:2010.3.15
Silicon alley: SiH and HOR are enantioselectively coupled in the presence of a chiral CuH complex. In this way, the kinetic resolution of racemic mixtures of alcohols is accomplished through asymmetric protection with standard silanes (see scheme; R=aryl or alkyl, Ar=3,5‐xylyl, Np=2‐naphthyl; s=selectivity factor).
硅胡同:硅 H和H 或者,对映选择性地耦合在手性铜的存在 H络合物。通过这种方式,醇的外消旋混合物的动力学拆分可通过使用标准硅烷进行不对称保护来实现(参见方案; R =芳基或烷基,Ar = 3,5-二甲苯基,Np = 2-萘基; s =选择性因子)。
Synthesis of β-Lactams by Palladium(0)-Catalyzed C(sp<sup>3</sup>)−H Carbamoylation
作者:David Dailler、Ronan Rocaboy、Olivier Baudoin
DOI:10.1002/anie.201703109
日期:2017.6.12
A general and user‐friendly synthesis of β‐lactams is reported that makes use of Pd0‐catalyzed carbamoylation of C(sp3)−H bonds, and operates under stoichiometric carbon monoxide in a two‐chamber reactor. This reaction is compatible with a range of primary, secondary and activated tertiary C−H bonds, in contrast to previous methods based on C(sp3)−H activation. In addition, the feasibility of an enantioselective
Derivatives of α,α,α′,α′-Tetraaryl-2,2-dimethyl-1,3-dioxolan-4,5-dimethanol (TADDOL) containing nitrogen, sulfur, and phosphorus atoms. New ligands and auxiliaries for enantioselective reactions.
作者:Dieter Seebach、Michiya Hayakawa、Jun-ichi Sakaki、W.Bernd Schweizer
DOI:10.1016/s0040-4020(01)80529-9
日期:1993.2
(5c–5f), as well as a bis(trifluoroacetamide) (5g). Cyclization of the aminoalcohol (4c) produces a bicyclic system (7), containing a pyrrolidine ring (structure determination by X-ray diffraction). - The new chiral compounds containingnitrogen and phosphorusatoms might be useful ligands and auxiliaries for enantioselective syntheses.
Ligand-Enabled Enantioselective Csp3
-H Activation of Tetrahydroquinolines and Saturated Aza-Heterocycles by Rh<sup>I</sup>
作者:Steffen Greßies、Felix J. R. Klauck、Ju Hyun Kim、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201805680
日期:2018.7.26
The first rhodium(I)‐catalyzedenantioselective intermolecular C–Hactivation of various saturated aza‐heterocycles including tetrahydroquinolines, piperidines, piperazines, azetidines, pyrrolidines, and azepanes is presented. The combination of a rhodium(I) precatalyst and a chiral monodentate phosphonite ligand is shown to be a powerful catalytic system to access a variety of important enantio‐enriched