Multicomponent Synthesis of Isoindolinone Frameworks via Rh<sup>III</sup>-Catalysed in situ Directing Group-Assisted Tandem Oxidative Olefination/Michael Addition
作者:Liang Wang、Xi Liu、Jian-biao Liu、Jun Shen、Qun Chen、Ming-yang He
DOI:10.1002/asia.201800120
日期:2018.4.4
A RhIII‐catalysed three‐component synthesis of isoindolinone frameworks via direct assembly of benzoyl chlorides, o‐aminophenols and activated alkenes has been developed. The process involves in situ generation of o‐aminophenol (OAP)‐based bidentate directing group (DG), RhIII‐catalysed tandem ortho C−H olefination and subsequent cyclization via aza‐Michael addition. This protocol exhibits good chemoselectivity
Supported Pd-catalyzed ring opening and chemoselective aminocarbonylative coupling of benzoxazoles with aryl iodides
作者:Pushkar Mehara、Ajay Kumar Sharma、Ashish Kumar、Poonam Sharma、Pralay Das
DOI:10.1039/d4cy00070f
日期:——
A tandem approach using polystyrene supported Pd catalyzed ring opening aminocarbonylative coupling of benzoxazoles with aryl iodides has been developed for the synthesis of N-(2-hydroxyphenyl)benzamides using solid oxalic acid as the CO source.
以固体草酸为 CO 源,开发了一种串联方法,利用聚苯乙烯支撑的钯催化苯并恶唑与芳基碘化物的开环氨基羰基偶联合成 N-(2-羟基苯基)苯甲酰胺。
A microwave assisted synthesis of benzoxazoles from carboxylic acids
作者:Giammario Nieddu、Giampaolo Giacomelli
DOI:10.1016/j.tet.2012.10.084
日期:2013.1
A series of various poly-substituted benzoxazoles were synthesized starting from readily available carboxylic acids. The method is based on TCT (cyanuric chloride)/microwave acid activation and it is characterized by mild conditions, allowing for a wide range of starting materials and functionalization of final products. (c) 2012 Elsevier Ltd. All rights reserved.
Biochemical and Structural Evaluation of Highly Selective 2-Arylbenzoxazole-Based Transthyretin Amyloidogenesis Inhibitors
作者:Steven M. Johnson、Stephen Connelly、Ian A. Wilson、Jeffery W. Kelly
DOI:10.1021/jm0708735
日期:2008.1.1
To develop potent transthyretin (TTR) amyloidogenesis inhibitors that also display high binding selectivity in blood, it proves useful to systematically optimize each of the three substructural elements that comprise a typical inhibitor: the two aryl rings and the linker joining them. In the first study, described herein, structural modifications to one aryl ring were evaluated by screening a library of 2-arylbenzoxazoles bearing thyroid hormone-like aryl substituents on the 2-aryl ring. Several potent and highly selective amyloidogenesis inhibitors were identified that exhibit minimal thyroid hormone nuclear receptor and COX-1 binding. High resolution crystal structures (1.3-1.5 angstrom) of three inhibitors (2f, 4f, and 4d) in complex with TTR were obtained to characterize their binding orientation. Collectively, the results demonstrate that thyroid hormone-like substitution patterns on one aryl ring lead to potent and highly selective TTR amyloidogenesis inhibitors that lack undesirable thyroid hormone receptor or COX-1 binding.
Synthesis, antimicrobial, and QSAR studies of substituted benzamides
A series of new substituted benzamides were synthesized and tested in vitro for their antibacterial activity against Grampositive and Gram-negative bacteria and as well for antifungal activity. The compounds 8i and 9 showed better activity among the different benzamides synthesized. The structural characteristics governing antibacterial activities of substituted benzamides were studied using QSAR methodology. The results showed that the antimicrobial activity could be modeled using the topological descriptors, molecular connectivity indices ((2)chi(v) and (2)chi) and Kiers shape index (kappa alpha(1)). The low residual activity and high cross-validated r(2) values (r(cv)(2)) observed indicated the predictive ability of the developed QSAR models. (C) 2007 Elsevier Ltd. All rights reserved.