Discovery of tetrahydro-β-carboline- and indole-based derivatives as promising phosphodiesterase-4 inhibitors: Synthesis, biological evaluation, and molecular modeling studies
作者:Khaled M. Darwish、Ahmad Abdelwaly、Asmaa M. Atta、Mohamed A. Helal
DOI:10.1016/j.molstruc.2021.131491
日期:2022.1
pocket (Q) includes the invariant purine-selective Gln443 which is critical for cAMP. Below this Gln443 lies Phe446 which acts as a hydrophobic P-clamp stabilizing the ligand aromatic ring system. Molecular docking investigation showed preferential anchoring of the active compounds within the PDE4 active site through interactions between the indole nitrogens and the dimethoxy phenyl groups with key residues
Catalytic Asymmetric Pictet–Spengler Reactions via Sulfenyliminium Ions
作者:Martin J. Wanner、Richard N. S. van der Haas、Kimberly R. de Cuba、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/anie.200701808
日期:2007.10.1
Bioreduction of β-carboline imines to amines employing Saccharomyces bayanus
作者:Marlene Espinoza-Moraga、Tania Petta、Marco Vasquez-Vasquez、V. Felipe Laurie、Luis A.B. Moraes、Leonardo Silva Santos
DOI:10.1016/j.tetasy.2010.06.036
日期:2010.8
beta-Carboline imine reductions mediated by Saccharomyces bayanus have been described achieving moderate to good enantiomeric excesses of the amine products. The enantiomeric excesses of the bioreduction showed a dependence on the imine substituents. Compounds presenting C-1-C-11 aliphatic substituent groups afforded amines with an (S)-configuration, whereas C-15 and higher aliphatic, and aromatic substituted B-carboline imines achieved inversion of the configuration in the final (R)-2 amine products. Based on this data, a model for the Saccharomyces reduction is proposed. (C) 2010 Elsevier Ltd. All rights reserved.
Palladium asymmetric reduction of β-carboline imines mediated by chiral auxiliaries assisted by microwave irradiation
An alternative synthetic approach for the introduction of chirality in β-carboline moiety through in situ reduction of N-acyliminium ion intermediates generated from imine 2 and chloroformate of 8-phenylmenthyl as chiral auxiliary was achieved. The method applied microwave-assisted irradiation and used PdCl2/Et3SiH protocol as a mild reducing agent, which decreased reaction times to minutes when compared
通过原位还原由亚胺2和8-苯基薄荷基的氯甲酸酯作为手性助剂生成的N-酰基亚胺离子中间体,实现了另一种在β-咔啉部分中引入手性的合成方法。该方法采用微波辅助辐射,并使用PdCl 2 / Et 3 SiH协议作为温和的还原剂,与常规的热反应相比,该方法将反应时间缩短至数分钟。还原产生的R-胺的非对映选择性(4-12:1),与从Noyori不对称氢化催化剂获得的产物相比,在手性辅助去除和光谱数据后将其分配。