Highly Enantioselective SPINOL-Derived Phosphoric Acid Catalyzed Transfer Hydrogenation of Diverse C=N-Containing Heterocycles
作者:Yiliang Zhang、Rong Zhao、Robert Li-Yuan Bao、Lei Shi
DOI:10.1002/ejoc.201500330
日期:2015.5
A highly efficient and enantioselectivehydrogenation of diversely substituted C=N-containing heterocyclic compounds such as 3-aryl-1,4-benzoxazines and 2-arylquinolines was experimentally explored by using 1,1′-spirobiindane-7,7′-diol-derived chiral phosphoric acids as the catalyst. This method provides straightforward access to the corresponding tetrahydroquinolines and dihydro-2H-1,4-benzothiazines
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Promoted hydrogenations of N-heterocycles with ammonia borane
作者:Fangwei Ding、Yiliang Zhang、Rong Zhao、Yanqiu Jiang、Robert Li-Yuan Bao、Kaifeng Lin、Lei Shi
DOI:10.1039/c7cc04709f
日期:——
A transition-metal-free method for the B(C6F5)3-promoted hydrogenations of N-heterocycles using ammonia borane under mild reaction conditions has been developed. The reaction affords a broad range of hydrogenated products in moderate to good yields. The enantioselective versions for the corresponding products were also investigated via our approach, showing good feasibility.
已开发出一种无过渡金属的方法,该方法使用硼烷氨在温和的反应条件下进行B(C 6 F 5)3促进的N-杂环加氢反应。该反应以中等至良好的产率提供了广泛的氢化产物。还通过我们的方法对相应产品的对映选择性进行了研究,显示出良好的可行性。
Two homochiral organocatalytic metal organic materials with nanoscopic channels
作者:Zhuxiu Zhang、Young Ran Ji、Lukasz Wojtas、Wen-Yang Gao、Shengqian Ma、Michael J. Zaworotko、Jon C. Antilla
DOI:10.1039/c3cc43801e
日期:——
Two homochiral organocatalytic MOMs were prepared using tetra- and octa-carboxylate ligands, respectively. The nanoscopic channels in these MOMs are lined by organonocatalytic chiral phosphoric acid derivatives of binol and ocMOM-1 exhibited improved enantioselectivity over the parent ligand in the context of transfer hydrogenation of a series of benzoxazines.
Asymmetric Transfer Hydrogenation of Heterocyclic Compounds in Continuous Flow Using an Immobilized Chiral Phosphoric Acid as the Catalyst
作者:Pavel Nagorny、Oleksii Zhelavskyi、Yin-Jia Jhang
DOI:10.1055/a-2085-5256
日期:2023.8
This manuscript describes transfer hydrogenation of bicyclic nitrogen-containing heterocycliccompoundsusing the immobilized chiral phosphoric acid catalyst (R)-PS-AdTRIP in batch and continuous flow. A significant improvement in enantioselectivities is achieved in continuous flow with a fluidized bed reactor packed with (R)-PS-AdTRIP when the flow rate is increased from 0.2 mL/min to 2.0–2.5 mL/min
该手稿描述了使用固定化手性磷酸催化剂 ( R )-PS-AdTRIP 以间歇和连续流进行双环含氮杂环化合物的转移氢化。当流速从 0.2 mL/min 增加到 2.0–2.5 mL/min 时,使用填充 ( R )-PS-AdTRIP的流化床反应器在连续流动中实现了对映选择性的显着改善。优化的连续流动条件始终比使用 2 mol% ( R )-PS-AdTRIP 的间歇转移氢化提供高 4–6% ee 的选择性,并用于使用相同的流化床反应器生成多种手性产物。
An Organocatalyst Bearing Stereogenic Carbon and Sulfur Centers as an Efficient Promoter for Enantioselective Hydrosilylation of 1,4-Benzooxazines
作者:Xiang-Wei Liu、Chao Wang、Yan Yan、Yong-Qiang Wang、Jian Sun
DOI:10.1021/jo400187e
日期:2013.6.21
The efficient and enantioselective hydrosilylation of 3-aryl-1,4-benzooxazines was achieved using an l-phenyl alanine derived new Lewis base catalyst bearing stereogenic carbon and sulfur centers. In the presence of 2 mol % of catalyst, a broad range of 3-aryl-1,4-benzooxazines were hydrosilylated to afford the corresponding chiral 3-aryl-3,4-dihydro-2H-1,4-benzooxazine products with good to high yields (66-98%) and enantioselectivities (70-99% ee). This method provides an alternative approach with great practical application potential to access chiral 3-aryl-3,4-dihydro-2H-1,4-benzooxazines.