合成了具有 2-(2-吡啶基)乙基的有机杂原子化合物,并通过旋转圆盘电极伏安法测定了它们的氧化电位。发现氧化电位低于具有苯基代替吡啶基的相应化合物的氧化电位。吡啶基与杂原子的动态配位稳定了阳离子自由基中间体,似乎是促进电子转移的原因。分子内辅助的量级随着母体化合物氧化电位的增加而增加。这种趋势可以用吡啶氮的非键合 p 轨道和母体杂原子化合物的 HOMO 之间的能量匹配来解释。
Optimization of a β-Lactam Scaffold for Antibacterial Activity via the Inhibition of Bacterial Type I Signal Peptidase
作者:Chien-Hung Yeh、Shawn I. Walsh、Arryn Craney、M. Greg Tabor、Ana-Florina Voica、Ramkrishna Adhikary、Sydney E. Morris、Floyd E. Romesberg
DOI:10.1021/acsmedchemlett.8b00064
日期:2018.4.12
suggest that β-lactams with the 5S stereochemistry, as opposed to the 5R stereochemistry of the traditional β-lactams, would be required for inhibition. We report the synthesis and evaluation of a variety of 5S penem derivatives and identify several with promising activity against both a Gram-positive and a Gram-negative bacterial pathogen. To our knowledge these are the first 5S β-lactams to possess significant
Provided is a process for producing a bisphenol compound stably at a high conversion and with high selectivity over a long period. A process for producing a bisphenol compound by feeding a phenol compound and a carbonyl compound continuously to a reactor packed with an acid catalyst, characterized in that the acid catalyst is a sulfonic-acid-form cation-exchange resin in which part of the sulfo groups have been modified with at least any one of 2-pyridylalkanethiol compounds and 3-pyridylalkanethiol compounds.