Synthesis of Fused Oxazolocoumarins from <i>o</i>
-Hydroxynitrocoumarins and Benzyl Alcohol Under Gold Nanoparticles or FeCl<sub>3</sub>
Catalysis
作者:Evangelia-Eirini N. Vlachou、Gerasimos S. Armatas、Konstantinos E. Litinas
DOI:10.1002/jhet.2842
日期:2017.7
Synthesis of fused oxazolocoumarins has been achieved from the one‐pot tandem reactions of o‐hydroxynitrocoumarins with benzyl alcohol in toluene undercatalysis in a sealed tube at 150°C. The catalysis was performed by gold nanoparticles supported on TiO2 (0.4 mol% Au) or FeCl3 (5%) or silver nanoparticles supported on TiO2 (1.7 mol% Ag).
Tricyclic heteroaromatic systems. Synthesis and benzodiazepine receptor affinity of 2-substituted-1-benzopyrano[3,4-d]oxazol-4-ones, -thiazol-4-ones, and -imidazol-4-ones
A number of 2-aryl-substituted-1-benzopyrano[3,4-d] oxazol-4-ones 1, -thiazol-4-ones 2 and -imidazol-4-ones 3 were synthesized. Benzodiazepine receptor (BZR) binding assays were performed on these series of tricyclic heteroaromatic systems. None of the tested compounds showed detectable affinity for BZR. Comparative structure-activity relationship analysis between the reported compounds and some known BZR ligands of similar size and shape revealed that, according to a two-dimensional schematic representation of the interaction of these kinds of tricyclic heteroaromatic systems with the BZR recognition site, the nature of the optional a. proton acceptor is of significant importance in the receptor-ligand interaction. (C) 1998 Elsevier Science S.A. All rights reserved.
PONOMAREV, O. A.;BRUSILTSEV, YU. N.;GRIF, V. X.;MITINA, V. G., YKP. XIM. ZH., 56,(1990) N, S. 272-276
作者:PONOMAREV, O. A.、BRUSILTSEV, YU. N.、GRIF, V. X.、MITINA, V. G.
DOI:——
日期:——
Synthesis of fused oxazole-containing coumarin derivatives via oxidative cross coupling reaction using a combination of CuCl<sub>2</sub> and TBHP
作者:Md. Belal、Abu T. Khan
DOI:10.1039/c5ra27993c
日期:——
Various fused oxazoles containing coumarin derivatives were synthesized via an oxidative cross coupling reaction by employing 20 mol% CuCl2 as the catalyst and TBHP as an oxidant.
An efficient method is disclosed for the synthesis of various tetracyclic 4H-benzo[5,6]chromeno[3,4-d]oxazoles from oxazole tethered β-naphthols via intramoleculardirect heteroarylation by employing a palladium catalyst. Furthermore, photophysical properties of the resulting molecules were evaluated by using UV/vis absorption and fluorescence spectroscopy.
公开了一种使用钯催化剂通过分子内直接杂芳基化从恶唑系链β-萘酚合成各种四环 4 H-苯并[5,6]苯并[3,4- d ]恶唑的有效方法。此外,通过使用 UV/vis 吸收和荧光光谱评估所得分子的光物理性质。