卵黄-壳介孔结构的二氧化硅被用作支持活性位点分离的双功能催化剂的开发载体,该催化剂可介导顺序的有机转化。本文中,通过固定,控制了两种催化物质的位置:将碱性官能团锚定在二氧化硅外部壳的通道中,并且将手性钌/二胺官能团锚定在内部二氧化硅卵黄上。结果是卵黄-壳介孔结构的二氧化硅负载的活性部位分离的双分子催化剂。通过固态碳13 C NMR光谱进行的结构分析显示其定义明确的单中心双活性中心。电子显微镜研究揭示了其均匀分布的介孔纳米粒子。按照设想,该双功能催化剂实现了可控的氮杂-迈克尔加成/不对称转移加氢催化顺序,其中碱催化的烯酮和胺的氮杂-迈克尔加成到芳基取代的β-仲氨基酮上,随后是Ru催化的不对称转移加氢。通过这种一锅式对映选择性有机转化,可以高收率和对映选择性获得各种芳基取代的γ-仲氨基醇。此外,非均相催化剂可用于连续流方法中,这被证明对于在环境友好的介质中实际制备芳基取代的γ-仲氨基醇特别有吸
A Michael Addition–Asymmetric Transfer Hydrogenation One-Pot Enantioselective Tandem Process for Syntheses of Chiral γ-Secondary Amino Alcohols
作者:Liang Wu、Ronghua Jin、Liang Li、Xiaoying Hu、Tanyu Cheng、Guohua Liu
DOI:10.1021/acs.orglett.7b00823
日期:2017.6.16
hydrogenation tandem process for preparation of chiral γ-secondary aminoalcohols has been developed. This one-pot tandem process involves an aza-Michael addition of aryl-substituted enones and amines to form aryl-substituted γ-secondary amino ketones, followed by a Ru-catalyzed asymmetric transfer hydrogenation to form aryl-substituted γ-secondary aminoalcohols. An advantageous feature of this tandem reaction
Manganese‐Catalyzed Asymmetric Formal Hydroamination of Allylic Alcohols: A Remarkable Macrocyclic Ligand Effect
作者:Faju Li、Linhong Long、Yan‐Mei He、Zeyu Li、Hui Chen、Qing‐Hua Fan
DOI:10.1002/anie.202202972
日期:2022.6.27
The first example of Mn-catalyzed asymmetric formal anti-Markovnikov hydroamination of allylic alcohols is described by using a chiral peraza N6-macrocyclic ligand. DFT calculations revealed that multiple noncovalent interactions existed among the ligand, solvent, and substrate in the transition states, showing a remarkable macrocyclic ligand effect.
通过使用手性 peraza N 6 -大环配体描述了 Mn 催化的烯丙醇不对称形式反马尔科夫尼科夫加氢胺化的第一个例子。DFT计算表明,过渡态的配体、溶剂和底物之间存在多种非共价相互作用,表现出显着的大环配体效应。
Yolk-Shell-Mesostructured Silica-Supported Dual Molecular Catalyst for Enantioselective Tandem Reactions
作者:Liang Wu、Yilong Li、Jingjing Meng、Ronghua Jin、Jingrong Lin、Guohua Liu
DOI:10.1002/cplu.201800377
日期:2018.9
active-site-isolated dual molecule catalyst. Structural analysis through solid-state carbon 13 C NMR spectroscopy reveals its well-defined single-site dual active centers. Electron microscopy investigations disclose its uniformly distributed mesoporous nanoparticles. As envisaged, this bifunctional catalyst enables a controllable aza-Michael addition/asymmetrictransferhydrogenation catalytic sequence, where
卵黄-壳介孔结构的二氧化硅被用作支持活性位点分离的双功能催化剂的开发载体,该催化剂可介导顺序的有机转化。本文中,通过固定,控制了两种催化物质的位置:将碱性官能团锚定在二氧化硅外部壳的通道中,并且将手性钌/二胺官能团锚定在内部二氧化硅卵黄上。结果是卵黄-壳介孔结构的二氧化硅负载的活性部位分离的双分子催化剂。通过固态碳13 C NMR光谱进行的结构分析显示其定义明确的单中心双活性中心。电子显微镜研究揭示了其均匀分布的介孔纳米粒子。按照设想,该双功能催化剂实现了可控的氮杂-迈克尔加成/不对称转移加氢催化顺序,其中碱催化的烯酮和胺的氮杂-迈克尔加成到芳基取代的β-仲氨基酮上,随后是Ru催化的不对称转移加氢。通过这种一锅式对映选择性有机转化,可以高收率和对映选择性获得各种芳基取代的γ-仲氨基醇。此外,非均相催化剂可用于连续流方法中,这被证明对于在环境友好的介质中实际制备芳基取代的γ-仲氨基醇特别有吸