Iron-catalyzed asymmetric hydrosilylation of ketones
作者:Ziqing Zuo、Lei Zhang、Xuebing Leng、Zheng Huang
DOI:10.1039/c5cc00612k
日期:——
iminopyridine-oxazoline (IPO) ligands have been synthesized. The most sterically hindered iron catalyst exhibits excellent activity (up to 99% yield) and high enantioselectivity (up to 93% ee) in asymmetrichydrosilylation of aryl ketones.
The synthesis of a new paracyclophane phosphine is described. This ligand was highly efficient in the ruthenium-catalyzed asymmetric hydrogenation of various aromatic and heteroaromatic ketones.
描述了一种新的对环烷膦的合成。该配体在钌催化的各种芳族和杂芳族酮的不对称氢化中非常有效。
Retracted: The Manganese(I)‐Catalyzed Asymmetric Transfer Hydrogenation of Ketones: Disclosing the Macrocylic Privilege
作者:Alessandro Passera、Antonio Mezzetti
DOI:10.1002/anie.201912605
日期:2020.1.2
The bis(carbonyl) manganese(I) complex [Mn(CO)2 (1)]Br (2) with a chiral (NH)2 P2 macrocyclic ligand (1) catalyzes the asymmetrictransferhydrogenation of polar double bonds with 2-propanol as the hydrogen source. Ketones (43 substrates) are reduced to alcohols in high yields (up to >99 %) and with excellent enantioselectivities (90-99 % ee). A stereochemical model based on attractive CH-π interactions
Nickel-Catalyzed Borylation of Benzylic Ammonium Salts: Stereospecific Synthesis of Enantioenriched Benzylic Boronates
作者:Corey H. Basch、Kelsey M. Cobb、Mary P. Watson
DOI:10.1021/acs.orglett.5b03455
日期:2016.1.4
stereospecific, nickel-catalyzed cross-coupling of secondarybenzylic ammonium salts and diboronate esters to deliver highly enantioenriched benzylic boronates. This reaction utilizes amine-derived electrophiles, which are readily available in high enantiopurity, and simple, inexpensive nickel catalysts. This reaction has broad scope, enabling synthesis of a variety of secondarybenzylic boronates in
Benzimidazoles as Ligands in the Ruthenium-Catalyzed Enantioselective Bifunctional Hydrogenation of Ketones
作者:Jeremy M. Praetorius、Ruiyao Wang、Cathleen M. Crudden
DOI:10.1021/om900897b
日期:2010.2.8
ligands bound to the ruthenium center are active for the mild and chemoselective hydrogenation of ketones in the presence of alkenes. Catalysts that exist as a single diastereomer, prepared with enantiomerically pure diphosphanes, catalyze the hydrogenation of prochiral ketones with moderate levels of enantioselectivity that are significantly improved relative to catalysts existing in several conformations
L = N的一系列Cl 2 Ru(diphosphane)L 2(II)配合物已经合成并表征了通过氮键与金属键合的1-烷基化苯并咪唑。对于1-甲基苯并咪唑,所得络合物以所有可能的构象异构体的统计混合物形式存在。当苯并咪唑上的取代基的大小增加到10时,可以制备出以单一非对映异构体形式存在的络合物。所有具有结合到钌中心的苯并咪唑配体的配合物在烯烃存在下对酮的轻度和化学选择性氢化均具有活性。用对映体纯的二膦制备的以单一非对映异构体形式存在的催化剂以中等对映体选择性催化前手性酮的氢化,相对于以几种构象存在的催化剂,该手性酮的氢化显着提高。