描述了通过Fischer吲哚化反应合成吡喃并[3,2- e ]吲哚生物碱font烷B的方法。费舍尔关键的这种吲哚化反应从完整的吡喃环和烯烃开始,促进了潜在的合成应用。此外,评估了font丹碱B及其异构体对人结肠直肠癌细胞的体外抗增殖活性。ane丹宁B的异构体显示出比天然产物font丹宁B高的抗增殖活性(2)。
Reducing the Flexibility of Type II Dehydroquinase for Inhibition: A Fragment-Based Approach and Molecular Dynamics Study
作者:Antonio Peón、Adrián Robles、Beatriz Blanco、Marino Convertino、Paul Thompson、Alastair R. Hawkins、Amedeo Caflisch、Concepción González-Bello
DOI:10.1002/cmdc.201700396
日期:2017.9.21
the type II dehydroquinase from Helicobacter pylori. This enzyme, which is essential for the survival of this bacterium, is involved in the biosynthesis of aromatic amino acids. A computer‐aided fragment‐based protocol (ALTA) was first used to identify the aromatic fragments able to block the interface pocket that separates two neighboring enzyme subunits and is located at the activesite entrance
Anthranilic acid based CCK1 receptor antagonists: Blocking the receptor with the same ‘words’ of the endogenous ligand
作者:Lucia Lassiani、Michela V. Pavan、Federico Berti、George Kokotos、Theodoros Markidis、Laura Mennuni、Francesco Makovec、Antonio Varnavas
DOI:10.1016/j.bmc.2009.02.012
日期:2009.3
The anthranilic acid diamides represent the more recent class of nonpeptide CCK1 receptor antagonists. This class is characterized by the presence of anthranilic acid, used as a molecular scaffold, and two pharmacophores selected from the C-terminal tetrapeptide of CCK. The lead compound coded VL-0395, endowed with sub-micromolar affinity towards CCK1 receptors, was characterized by the presence of Phe and 2-indole moiety at the C- and N-termini of anthranilic acid, respectively. Herein we describe the first step of the anthranilic acid C- terminal optimization using, instead of Phe, aminoacids belonging to the primary structure of CCK-8 and other not coded residues. Thus we demonstrate that the CCK1 receptor affinity depends on the nature of the aminoacidic side chain as well as that the free carboxy group of the alpha-aminoacids is crucial for the binding. The R enantiomers of the most active compounds represent the eutomers of this class of antagonists confirming thus the stereo preference of the receptor. Moreover this SAR study demonstrates that the receptor binding pocket, that host the aminoacidic side chain, results much more tolerant respect to that accommodating the indole ring. As a result, an appropriate variation of the aminoacidic side chain could provide a better CCK1 receptor affinity diorthosis. (C) 2009 Elsevier Ltd. All rights reserved.
Diversity oriented total synthesis (DOTS) of pyridoquinazolinone alkaloids and their analogues
作者:Sivappa Rasapalli、Yanchang Huang、Vamshikrishna Reddy Sammeta、Reem Alshehry、Fazmina Anver、James A. Golen、Shivasankar Krishnamoorthy、Subhash P. Chavan