Cation–π and π–π stacking interactions allow selective inhibition of butyrylcholinesterase by modified quinine and cinchonidine alkaloids
摘要:
Scaffold varied quaternized quinine and cinchonidine alkaloid derivatives were evaluated for their selective butyrylcholinesterase (BChE) inhibitory potential. K-i values were between 0.4-260.5 mu M (non-competitive inhibition) while corresponding K(i)values to acetylcholinesterase (AChE) ranged from 7.0-400 mu M exhibiting a 250-fold selectivity for BChE.Docking arrangements (GOLD. PLANT) revealed that the extended aromatic moieties and the quaternized nitrogen of the inhibitors were responsible for specific pi-pi stacking and pi-cation interactions with the choline binding site and the peripheral anionic site of BChE's active site. (C) 2010 Elsevier Inc. All rights reserved.
Cinchona-Alkaloid-Derived NNP Ligand for Iridium-Catalyzed Asymmetric Hydrogenation of Ketones
作者:Lin Zhang、Ling Zhang、Qian Chen、Linlin Li、Jian Jiang、Hao Sun、Chong Zhao、Yuanyong Yang、Chun Li
DOI:10.1021/acs.orglett.1c04101
日期:2022.1.14
Most ligands applied for asymmetrichydrogenation are synthesized via multistep reactions with expensive chemical reagents. Herein, a series of novel and easily accessed cinchona-alkaloid-based NNP ligands have been developed in two steps. By combining [Ir(COD)Cl]2, 39 ketones including aromatic, heteroaryl, and alkyl ketones have been hydrogenated, all affording valuable chiral alcohols with 96.0–99
大多数用于不对称氢化的配体是通过与昂贵的化学试剂的多步反应合成的。在此,一系列新颖且易于获取的基于金鸡纳生物碱的 NNP 配体已分两步开发。通过结合 [Ir(COD)Cl] 2,包括芳族酮、杂芳基酮和烷基酮在内的 39 种酮被氢化,均能提供有价值的手性醇,其 ee 为 96.0–99.9%。通过NMR、HRMS和DFT讨论了合理的反应机理,并验证了涉及三氢化物的活化模型。
Minisci reaction of heteroarenes and unactivated C(sp<sup>3</sup>)–H alkanes <i>via</i> a photogenerated chlorine radical
Here, an efficient Minisci reaction of heteroarenes and unactivated C(sp3)–H alkanes was achieved using an inexpensive FeCl3 as a photocatalyst. The photogenerated chlorine radical contributed to the HAT of C–H and subsequently initiated this reaction. Surprisingly, salt water and even seawater can act as a chlorine radical source, which provided an enlightening idea for future organic synthesis methods