Asymmetric transfer hydrogenation of ketones catalyzed by nickel complex with new PNO-type ligands
作者:Zhen Rong Dong、Yan Yun Li、Shen Luan Yu、Guo Song Sun、Jing Xing Gao
DOI:10.1016/j.cclet.2012.02.005
日期:2012.5
The new polydentate mixed-N, P, O chiralligands have been synthesized by the condensation of bis(o-formylphenyl)-phenylphosphane and R-phenylglycinol in CHCl3, and fully characterized by IR, NMR and EIMS spectra. These ligands were employed with a simple Ni complex Ni(PPhs)2Cl2in situ as catalytic systems for asymmetrictransferhydrogenation of ketones, and the corresponding optical alcohols were
Novel P2N4‐donors containing chiral 22‐membered macrocyclic ligands have been synthesized and the structures have been determined by an X‐ray diffraction study. The catalytic systems in situ generated from triiron dodecarbonyl, Fe3(CO)12, and the chiral macrocyclic ligand exhibited high activity (TOF up to 1940 h−1) and excellent enantioselectivity with up to 99% ee in the asymmetric transfer hydrogenation
合成了含有手性22元大环配体的新型P 2 N 4供体,并通过X射线衍射研究确定了其结构。由三羰基铁,Fe 3(CO)12和手性大环配体产生的催化体系在各种不对称转移氢化反应中表现出高活性(TOF高达1940 h -1)和优异的对映选择性,ee高达99%ee。芳香酮。
Oxidation-reduction of bis(o-formylphenyl)phenylphosphine by water
作者:Edith F. Landvatter、Thomas B. Rauchfuss
DOI:10.1039/c39820001170
日期:——
Bis(o-formylphenyl)phenyphosphine (1) undergoes acid catalysed hydration yielding a phosphine oxide with concomitant reduction of one formyl group; mechanistic studies suggest the importance of phosphorane intermediates in this reaction.
Carbene‐Catalyzed and Pnictogen Bond‐Assisted Access to PIII‐Stereogenic Compounds
作者:Jianjian Liu、Rui Deng、Xuyang Liang、Mali Zhou、Pengcheng Zheng、Yonggui Robin Chi
DOI:10.1002/anie.202404477
日期:2024.7.8
carbene catalysis was developed. The Lewis acidic P center simultaneously activate the bonded formyl group and stabilize the conformation of Breslow intermediates, it may help to achieve high stereo and regio-selectivities. Following the oxidation of the Breslow intermediate, nucleophile facilitates recycling of NHC to generate enantioenriched trivalentphosphorus compounds.
开发了一种结合分子内 PnB 相互作用和卡宾催化不对称合成手性 P III化合物的催化方法。 Lewis酸性P中心同时激活键合的甲酰基并稳定Breslow中间体的构象,可能有助于实现高立体和区域选择性。 Breslow 中间体氧化后,亲核试剂促进 NHC 的再循环,生成对映体富集的三价磷化合物。
Novel chiral C2-symmetric multidentate aminophosphine ligands for use in catalytic asymmetric reduction of ketones
A series of novel chiral C-2-symmetric multidentate aminophosphine ligands have been successfully synthesized by Schiff-base condensation of bis(o-formylphenyl)phenylphosphane and easily available monoprotected (1R,2R)-diaminocyclohexane. The catalytic properties of these ligands were investigated in Ir-catalyzed asymmetric transfer hydrogenation of various aromatic ketones, giving the corresponding optical active alcohols with up to 98% conversion and good ee under mild reaction conditions. (C) 2013 Yan-Yun Li. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.