A Bisphenolic Honokiol Analog Outcompetes Oral Antimicrobial Agent Cetylpyridinium Chloride via a Membrane-Associated Mechanism
摘要:
Targeting Streptococcus mutans is the primary focus in reducing dental caries, one of the most common maladies in the world. Previously, our groups discovered a potent bactericidal biaryl compound that was inspired by the natural product honokiol. Herein, a structure activity relationship (SAR) study to ascertain structural motifs key to inhibition is outlined. Furthermore, mechanism studies show that bacterial membrane disruption is central to the bacterial growth inhibition. During this process, it was discovered that analog C2 demonstrated a 4-fold better therapeutic index compared to the commercially available antimicrobial cetylpyridinium chloride (CPC) making it a viable alternative for oral care.
通过钯催化的C(sp 3)–C(sp 3)氢解对苄基的季碳,叔碳和仲碳中心进行修饰)呈现σ键。当在温和的氢解条件下(含钯碳和氢气的大气压)处理带有季苄基中心的苄基麦德鲁姆的酸衍生物时,就可以很好地获得高收率的芳族化合物,这些芳族化合物被叔苄基中心和麦德鲁姆酸所取代。类似地,含有叔或仲苄基中心的底物分别产生被仲苄基中心或甲苯衍生物取代的芳族化合物。此外,该策略用于二芳基甲烷的高产率合成。探索了还原性脱烷基反应的范围,并确定了对空间和电子因素的限制。描述了该反应的机理分析,该分析由氘标记实验和对映体富集的衍生物的氢解组成。调查显示,C(sp 3)–C(sp 3)σ键断裂事件是通过混合的S N 1 / S N 2机理发生的,其中钯中心置换了一个基于碳的离去基团,即Meldrum酸,其构型反转,随后通过还原消除钯来提供CH键。
Dual Nickel- and Photoredox-Catalyzed Reductive Cross-Coupling of Aryl Halides with Dichloromethane via a Radical Process
作者:Wenhao Xu、Purui Zheng、Tao XU
DOI:10.1021/acs.orglett.0c03248
日期:2020.11.6
The first catalytic strategy to harness a new chloromethane radical from dichloromethane under dual Ni/photoredox catalytic conditions has been developed. Compared with traditional two-electron reductiveprocess associated with metallic reductants, this method via a single-electron approach can proceed under exceptionally mild conditions (visible light, ambient temperature, no strong base) and exhibits
The present disclosure provides compounds of formula (I) or salts thereof, wherein R1- R10 and x are defined herein; compositions containing these compounds; methods of inhibiting, reducing, or ameliorating bacterial growth on a substrate using these compound; and products such as dental care products, soaps, antibacterial products, and plastics comprise one or more compounds described herein.
A one-potsynthesis of diarylmethanes from air-stable diborylmethane via the Suzuki–Miyaura cross-coupling reaction is described. The present approach realizes the synthesis of various symmetrical and unsymmetrical diarylmethanes in good to excellent yields.
A novel palladium-catalyzed coupling reaction of an arylmethylketone with two molecules of an aryl halide to yield symmetric diarylmethanes is described. In the facile one-pot reaction, the arylmethylketone acts as a formal methylene donor. The experimental facts, including TLC monitoring, speculated intermediates as the raw materials, analysis of the cesium benzoate coproduct by ex situ IR spectroscopy
Catalytic Double C-Cl Bond Activation in CH2Cl2 by Iron(III) Salts with Grignard Reagents
作者:Christopher Kozak、Xin Qian
DOI:10.1055/s-0030-1259922
日期:2011.4
Cross-coupling of Grignard reagents with dichloromethane is achieved using iron(III) catalysts. Aryl- and benzylmagnesium bromides show a range of activity toward double C-Cl bond activation resulting in the insertion of methylene fragments between two equivalents of the nucleophilic partner.