N-(2-azidophenyl)azolium salts were easily prepared and reacted with copper(I) in conditions allowing the formation of NHC complexes. In these conditions, the formation of benzimidazo-fused heterocycles occurred in catalytic, efficient and...
Application of the Pictet–Spengler reaction to aryl amine substrates linked to deactivated aromatic heterosystems
作者:B. Saha、S. Sharma、D. Sawant、B. Kundu
DOI:10.1016/j.tet.2008.07.003
日期:2008.9
Three new substrates with an aryl amine moiety attached to quinoxalines, triazoles and tetrazoles either via C or N have been used for the Pictet–Spenglerreaction. The substrates have been designed by applying the concept of ‘aryl amine attached to a deactivated heteroaromatic ring’ in a manner to facilitate endo cyclization. This is in contrast to the substrates used traditionally and reported earlier
We describe a set of three fluorescent mesoionic benzo[4,5]imidazo-3-ide-[1,2-c]-2-alkyl-1,2,3-triazol-2-ium compounds obtained through a simple, concise and efficient synthetic sequence featuring a copper-catalyzed carbene–nitrene cyclization. The compounds were characterized by fluorescence spectroscopy highlighting promising photophysical properties in terms of quantum yields and Stokes shifts.
我们描述了一组通过简单,简洁的方法获得的三种荧光中性苯并[4,5]咪唑基-3-ide- [1,2 - c ] -2-烷基-1,2,3-三唑-2-鎓化合物高效的合成序列,具有铜催化的卡宾-丁二烯环化反应。通过荧光光谱对化合物进行表征,其在量子产率和斯托克斯位移方面突出了有前途的光物理性质。通过计算DFT和TD-DFT方法使实验性质合理化,并且与结构和光谱数据具有极好的一致性。
Structure activity relationships, multidrug resistance reversal and selectivity of heteroarylphenyl ABCG2 inhibitors
作者:Sebastian C. Köhler、Sahel Vahdati、Matthias S. Scholz、Michael Wiese
DOI:10.1016/j.ejmech.2018.01.012
日期:2018.2
An overexpression of the transmembrane ATP-binding cassette transporter G2 (ABCG2, BCRP) in cancer tissues is supposed to play a role in the multidrug resistance (MDR) of tumors resulting in an inefficient chemotherapy. Therefore, co-administration of selective and non-toxic ABCG2 inhibitors is a promising strategy for improving the efficacy of chemotherapy by blocking ABCG2-mediated export of the cytostatic drugs. In the present study, we designed a small library of 38 novel compounds containing a heteroaryl-phenyl scaffold possessing several (bioisosteric) moieties, and twelve new precursors. We investigated the library for ABCG2 inhibition, for the selectivity against MDR-involved efflux pump ABCBI (P-gp) and for toxicity. Structure activity relationship (SAR) studies revealed that, at least a phenylheteroaryl-phenylamide scaffold is necessary for observing an ABCG2 inhibition. 4-Methoxy-N-(2(2-(6-methoxypyridin-3-yl)-2H-tetrazol-5-yl)phenyl)benzamide (43) exhibited a high potency (IC50 = 61 nM)), selectivity, low intrinsic toxicity and reversed the ABCG2-mediated drug resistance in presence of only 0.1 mu M. (C) 2018 Elsevier Masson SAS. All rights reserved.