公开了带有二和三取代烯烃的芳族和脂族烯丙基磷酸酯的有效对映选择性Cu催化的烯丙基烷基化。在 10 mol% 容易获得的手性氨基酸基配体(5 步,40% 总产率合成)和 5 mol% (CuOTf)2 x C6H6 存在下,对映选择性 CC 键形成反应得到促进。反应区域选择性地以 78-96% ee 传递叔和四元立体碳中心。提供了有关配体结构变化对烷基化过程的效率和对映选择性的影响的数据,以及机械工作模型。建议的模型涉及手性 Cu 络合物的双重作用:Cu(I) 中心与烯烃的结合是通过配体羰基之间的两点结合来促进的
Cu-Catalyzed Asymmetric Allylic Alkylations of Aromatic and Aliphatic Phosphates with Alkylzinc Reagents. An Effective Method for Enantioselective Synthesis of Tertiary and Quaternary Carbons
作者:Monica A. Kacprzynski、Amir H. Hoveyda
DOI:10.1021/ja0478779
日期:2004.9.1
Efficient enantioselective Cu-catalyzed allylicalkylations of aromatic and aliphatic allylic phosphates bearing di- and trisubstituted olefins are disclosed. Enantioselective C-C bond forming reactions are promoted in the presence of 10 mol % readily available chiral amino acid-based ligand (5 steps, 40% overall yield synthesis) and 5 mol % (CuOTf)2 x C6H6. Reactions deliver tertiary and quaternary stereogenic
公开了带有二和三取代烯烃的芳族和脂族烯丙基磷酸酯的有效对映选择性Cu催化的烯丙基烷基化。在 10 mol% 容易获得的手性氨基酸基配体(5 步,40% 总产率合成)和 5 mol% (CuOTf)2 x C6H6 存在下,对映选择性 CC 键形成反应得到促进。反应区域选择性地以 78-96% ee 传递叔和四元立体碳中心。提供了有关配体结构变化对烷基化过程的效率和对映选择性的影响的数据,以及机械工作模型。建议的模型涉及手性 Cu 络合物的双重作用:Cu(I) 中心与烯烃的结合是通过配体羰基之间的两点结合来促进的
Influence of Neighboring Groups on the Thermodynamics of Hydrophobic Binding: An Added Complex Facet to the Hydrophobic Effect
作者:Nader N. Nasief、David Hangauer
DOI:10.1021/jm401609a
日期:2014.3.27
proentropic in others. A remarkable enthalpy–entropy compensation relationship was also observed, reflecting the fact that the hydrophobiceffect is governed by the thermodynamic status of the associated aqueous environment. This study could improve our understanding of the hydrophobiceffect and may enhance our ability to design potent ligands that are capable of modulating biological processes.
Stereoselective syntheses of 1H-imidazo[2,1-a]isoindole-2,5(3H,9bH)-diones†
作者:Alan R. Katritzky、Yong-Jiang Xu、Hai-Ying He、Peter J. Steel
DOI:10.1039/b104060j
日期:——
1H-Imidazo[2,1-a]isoindole-2,5(3H,9bH)-diones 6a–i are synthesized in 67–96% yields with high stereoselectivities (de 88–99%, except 6e with a 58% de value) via intermolecular condensation of 2-formylbenzoic acid (5) and α-amino amides 4a–i in the presence of a catalytic amount of toluene-p-sulfonic acid. Intermediates 4 are obtained in two steps from easily available chiral N-Boc-α-amino acids 1.
A new antimalarial pharmacophore has been obtained starting from previously described dual inhibitors of Plasmodium falciparum.
从先前描述的疟原虫的双重抑制剂出发,得到了一种新的抗疟药物药效团。
Design, synthesis, and screen of cathepsin K inhibitors
作者:Ying-Ying Yu、Wei Sun、Lei Dong、Hai-Dong Liu、Dan Jiang、Jun-Hai Xiao、Xiao-Hong Yang、Song Li
DOI:10.1016/j.cclet.2013.05.002
日期:2013.8
We synthesized a series of epoxysuccinic acid derivatives and evaluated their in vitro cathepsin K inhibitory activity The screening results show that the potency of compounds 9e, 9d, 9p, 9j and 9k (IC50 <= 0.005 mu mol/L) were equal to or greater than that of the lead compound 9a. Less hydrophobic compounds showed weaker potency, which can be explained by the hydrophobic nature of the cathepsin K binding pockets. (C) 2013 Jun-Hai Xiao and Xiao-Hong Yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.