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.
Oxidative cross coupling reaction mediated by I<sub>2</sub>/H<sub>2</sub>O<sub>2</sub>: a novel approach for the construction of fused thiazole containing coumarin derivatives
作者:Md. Belal、Abu T. Khan
DOI:10.1039/c5ra20405d
日期:——
Various 2-phenyl-4H-chromeno(3,4-d)thiazol-4-one derivatives have been synthesized through C–H bond activation using sodium sulfide as a source of sulfur atoms and by employing I2 as a catalyst and H2O2 as the terminal oxidant.