在这项研究中,准备了一系列有机染料,以研究五元和六元环跃迁态之间在激发态下内部质子转移方面的差异。通过X射线晶体学,1 H NMR光谱和紫外/可见光谱证实了目标染料中不同强度的分子内氢键。荧光测量表明激发态分子内质子转移是通过六元环跃迁状态发生的,而不能通过五元环跃迁状态发生。目标染料的分子几何结构优化进一步考虑了由五或六元环跃迁态引起的激发态内部质子转移的差异。
Synthesis of optically active 1,2,3-trisubstituted azetidines employing an organocatalytic approach with l-proline
作者:Marcela Amongero、Teodoro S. Kaufman
DOI:10.1016/j.tetlet.2013.01.090
日期:2013.4
A concise organocatalyticapproach towards opticallyactive 1,2,3-trisubstituted azetidines, including a study of the scope and limitations of the synthetic sequence, is reported. The synthesis comprises the one-pot l-proline promoted three-component reaction between substituted benzaldehydes, anilines and enolizable aldehydes, followed by the in situ reduction of the resulting β-aminoaldehydes to
Dimethylzinc-Mediated, Enantioselective Synthesis of Propargylic Amines
作者:Lorenzo Zani、Torsten Eichhorn、Carsten Bolm
DOI:10.1002/chem.200601347
日期:2007.3.16
A one-pot, enantioselective synthesis of N-aryl propargylic amines, using alkynylation reagents obtained from dimethylzinc and terminal acetylenes in combination with various aldehydes and o-methoxyaniline as starting materials, has been developed. Enantiopure beta-amino alcohols derivedfromnorephedrine were used as non-covalent chiral auxiliaries, both in stoichiometric or substoichiometric amount
2,3-Dihydro-1,2-Diphenyl-substituted 4H-Pyridinone Derivatives as New Anti Flaviviridae Inhibitors
作者:Antonella Peduto、Antonio Massa、Antonia Di Mola、Paolo de Caprariis、Paolo La Colla、Roberta Loddo、Sergio Altamura、Giovanni Maga、Rosanna Filosa
DOI:10.1111/j.1747-0285.2011.01102.x
日期:2011.6
With the aim of identifying novel lead compounds active against emergent human infectious diseases, a series of 2,3‐dihydro‐4H‐pyridinone derivatives has been prepared and evaluated for antiviral activity. Compounds were evaluated in vitro in cell‐based assays for cytotoxicity and against a wide spectrum of viruses. In the antiviral screening, several compounds showed to be fairly active against viruses
number-membered ring transition states for internal proton transfer in excited state. Different strength intramolecular hydrogen bond in the target dyes was demonstrated by X-ray crystallography, 1H NMR spectroscopy and ultraviolet/visible spectroscopy. The fluorescence measurement suggested excited stateintramolecular proton transfer occurred via six number-membered ring transitionstate, while it could
在这项研究中,准备了一系列有机染料,以研究五元和六元环跃迁态之间在激发态下内部质子转移方面的差异。通过X射线晶体学,1 H NMR光谱和紫外/可见光谱证实了目标染料中不同强度的分子内氢键。荧光测量表明激发态分子内质子转移是通过六元环跃迁状态发生的,而不能通过五元环跃迁状态发生。目标染料的分子几何结构优化进一步考虑了由五或六元环跃迁态引起的激发态内部质子转移的差异。
Cooperative Bimetallic Co−Mn Catalyst: Exploiting Metallo‐Organic and Hydrogen Bonded Interactions for Rechargeable C‐/N‐Alkylation
a reusable catalyst for C-/N-alkylation of alcohols with higher reaction efficiency and selectivity compared to individual components via its flexible binding sites, diverse hydrogen bond donor-acceptor fragments, rigidity, variable coordination mode, and cooperativity.