α-(杂芳基)-α-烷基氰基乙酸酯的不对称合成是在两种类型的手性配体(( S )-nobin-体现的吡啶甲酰胺和L-羟基脯氨酸衍生的手性配体的帮助下,通过铜催化α-烷基取代的氰基乙酸酯的芳基化来实现的。酰胺。该反应提供了带有全碳四元中心并与可转换官能团连接的偶联产物,具有良好至优异的对映选择性(高达 95% ee)。
Highly enantioselective 1,4-conjugate addition of diethylzinc to acyclic enones with chiral phosphite–pyridine ligands derived from H8-NOBIN
作者:Yuanchun Hu、Xinmiao Liang、Junwei Wang、Zhuo Zheng、Xinquan Hu
DOI:10.1016/j.tetasy.2003.09.020
日期:2003.12
A series of new phosphite-pyridine ligands, based on the H-8-binaphthyl backbone, were synthesized and employed in the copper-catalyzed enantioselective 1,4-conjugate addition of diethylzinc to acyclic enones. Ligands derived from (S)-H-8-NOBIN provided better results than their parent ligands in the reaction. Ligand L1 provided excellent ees for trans -4-aryl-3-buten-2-ones (up to 97.8% ee) as substrates. Ligand L2 was very efficient for various para-chalcones, and up to 97.2% ee was achieved. (C) 2003 Elsevier Ltd. All rights reserved.
Readily Prepared Chiral P,N Ligands and Their Applications in Cu-Catalyzed Enantioselective Conjugate Additions
作者:Yuanchun Hu、Xinmiao Liang、Junwei Wang、Zhuo Zheng、Xinquan Hu
DOI:10.1021/jo0340758
日期:2003.5.1
A new type of phosphite-pyridine (P,N) ligand derived from (S)-NOBIN and (S)-BINOL was employed in Cu(I)-catalyzed conjugate addition of diethylzinc to chalcones. The new P,N ligands were highly efficient in the copper-catalyzed enantioselective 1,4-conjugate additions of diethylzinc to acyclic enones, and up to 97% ee was achieved.
Nonlinear effects in the enantioselective 1,4-conjugate addition of diethylzinc to chalcone
作者:Yuanchun Hu、Xinmiao Liang、Zhuo Zheng、Xinquan Hu
DOI:10.1016/j.tetasy.2003.07.001
日期:2003.9
A clear positive nonlinear effect of the enantiopurity of ligand 1 on the product ee was observed in the enantioselective 1,4-conjugate addition of Et2Zn to chalcone. The experimental data of nonlinear effect meet Kagan's ML2 model. (C) 2003 Elsevier Ltd. All rights reserved.
Copper‐Catalyzed Asymmetric Arylation of α‐Substituted Cyanoacetates Enabled by Chiral Amide Ligands
作者:Rongxing Zhang、Qinghai Zhou、Xin Wang、Lanting Xu、Dawei Ma
DOI:10.1002/anie.202312383
日期:2023.12.4
Asymmetric synthesis of α-(heteroaryl)-α-alkyl cyanoacetates was achieved by Cu-catalyzed arylation of α-alkyl substituted cyanoacetates under the assistance of two types of chiral ligands, (S)-nobin-embodied picolinamides and L-hydroxyproline-derived amides. The reaction afforded the coupling products bearing an all-carbon quaternary center tethered with convertiblefunctional groups in good to excellent
α-(杂芳基)-α-烷基氰基乙酸酯的不对称合成是在两种类型的手性配体(( S )-nobin-体现的吡啶甲酰胺和L-羟基脯氨酸衍生的手性配体的帮助下,通过铜催化α-烷基取代的氰基乙酸酯的芳基化来实现的。酰胺。该反应提供了带有全碳四元中心并与可转换官能团连接的偶联产物,具有良好至优异的对映选择性(高达 95% ee)。