From Phenothiazine to 3-Phenyl-1,4-benzothiazine Derivatives as Inhibitors of the <i>Staphylococcus aureus</i> NorA Multidrug Efflux Pump
作者:Stefano Sabatini、Glenn W. Kaatz、Gian Maria Rossolini、David Brandini、Arnaldo Fravolini
DOI:10.1021/jm701623q
日期:2008.7.1
Overexpression of effluxpumps is an important mechanism by which bacteria evade effects of substrate antimicrobial agents and inhibition of such pumps is a promising strategy to circumvent this resistance mechanism. NorA is a Staphylococcusaureusmultidrugeffluxpump, the activity of which confers decreased susceptibility to many structurally unrelated agents, including fluoroquinolones, resulting
Conversion of bis(o-nitrophenyl)disulfides to heterocycles containing sulfur and nitrogen by the action of samarium diiodide
作者:Weihui Zhong、Xiaoyuan Chen、Yongmin Zhang
DOI:10.1002/hc.1025
日期:——
Treatment of bis(o-nitrophenyl)disulfides 1 with SmI2 led to simultaneous reduction of nitro groups and reductive cleavage of S–S bonds as well as the formation of the active intermediates 2. The intermediates 2 reacted smoothly with aldehydes or ketones, acid chlorides or anhydrides, α-bromoketones, and α,β-unsaturated ketones at room temperature to afford the desired benzothiazolines 3, benzothiazoles
Synthesis and stereochemistry of Δ<sup>2,2′</sup>-bi-(2H-1,4-benzothiazine) derivatives. Crystal structures of cis- and trans-Δ<sup>2,2′</sup>-bi-(3-p-bromophenyl-2H-1,4-benzothiazine)
isomers has been explained in terms of the molecular structures of the cis- and trans- isomers of the 3-p-bromophenyl derivative (IIa) which were determined by three-dimensional X-ray analysis. The cis-isomer crystallizes in space group P, with Z= 2, in a unit cell of dimensions a= 10·18, b= 12·90, c= 10·65 Å, α= 113° 56′, β= 95° 57′, γ= 103° 5′. Crystals of the trans-isomer are monoclinic, space group
Application of sulfuric acid modified nano kaolin as a heterogeneous catalyst for the efficient synthesis of quinoxalines and benzothiazines
作者:Azam Karimian、Mahdi Norouzi、Zahra Nasri Fargi
DOI:10.1080/24701556.2022.2078365
日期:2024.9
Abstract Kaolin–OSO3H efficiently catalyzes the condensation of 2-aminobenzenethiol or benzene-1,2-diamine and 2-bromo-1-aryl-ethanones to yield quinoxaline and benzothiazine derivatives in good yields. The sulfuricacid modified nano kaolin was synthesized with a simple and low-cost method. The present method also has the advantages of good to excellent yields, short reaction times, operational simplicity
摘要 Kaolin-OSO 3 H 可有效催化 2-氨基苯硫醇或苯-1,2-二胺和 2-溴-1-芳基-乙酮缩合,以良好的收率生成喹喔啉和苯并噻嗪衍生物。硫酸改性纳米高岭土的合成方法简单、成本低。本方法还具有产率好至极好、反应时间短、操作简单、催化剂天然绿色等优点。