Bridging C−H Activation: Mild and Versatile Cleavage of the 8-Aminoquinoline Directing Group
作者:Martin Berger、Rajan Chauhan、Catarina A. B. Rodrigues、Nuno Maulide
DOI:10.1002/chem.201604344
日期:2016.11.14
activation within the last decade. However, cleavage of its robust amide bond has shown to be challenging in several cases, thus jeopardizing the general synthetic utility of the method. To overcome this limitation, we herein report a simple oxidative deprotection protocol. This transformation rapidly converts the robust amide to a labile imide, allowing subsequent cleavage in a simple one‐pot fashion to rapidly
Direct enantioseparation of axially chiral 1,1′-biaryl-2,2′-diols using amidine-based resolving agents
作者:Koichi Kodama、Fusato Takase、Takuji Hirose
DOI:10.1039/d1ra03546k
日期:——
separation of axially chiral1,1′-biaryl-2,2′-diols have been developed. A strongly basic amidine bearing no substituents on its nitrogen atoms enables the formation of their diastereomeric salts upon being mixed with weakly acidic phenol derivatives. Enantiopure 1,1′-biaryl-2,2′-diols can be obtained in high yields after only one crystallization of their salts with the chiral amidine derived from dehydroabietic
已经开发出用于轴向手性 1,1'-联芳基-2,2'-二醇对映体分离的脒基光学活性拆分剂。氮原子上不带取代基的强碱性脒在与弱酸性苯酚衍生物混合时能够形成其非对映体盐。对映体纯的1,1'-联芳基-2,2'-二醇只需与脱氢松香酸衍生的手性脒形成盐一次结晶即可高产率获得。 X 射线晶体学表明,脒部分与苯酚基团形成盐,并且额外的分子间 NH/π 相互作用有助于有效的手性识别过程。
New derivatives of dehydroabietic acid target planktonic and biofilm bacteria in Staphylococcus aureus and effectively disrupt bacterial membrane integrity
作者:Suvi Manner、Mikko Vahermo、Malena E. Skogman、Sara Krogerus、Pia M. Vuorela、Jari Yli-Kauhaluoma、Adyary Fallarero、Vânia M. Moreira
DOI:10.1016/j.ejmech.2015.07.038
日期:2015.9
The combination of the dehydroabietic acid scaffold with different amino acids resulted in the discovery of a new class of hybrid compounds that targets both planktonic and biofilms bacteria in Staphylococcus aureus strains and are far more potent anti-biofilm agents than conventional antibiotics. Unlike dehydroabietic acid, these compounds can disrupt biofilms within a short time period and compromise the integrity of the bacterial membrane. Two of the compounds identified in our study are the most potent abietane-type anti-biofilm agents reported so far and display robust activity against pre-formed biofilms at concentrations only 3-6-fold higher than those required to inhibit biofilm formation. Their easy preparation based on proteolysis-resistant D- and unusual amino acids makes them useful chemical probes to gain a deeper understanding of bacterial biofilms and outstanding candidates for further development into new drugs to fight infections. (C) 2015 Elsevier Masson SAS. All rights reserved.
Ohtsuka,Y.; Tahara,A., Chemical and pharmaceutical bulletin, 1973, vol. 21, p. 653 - 658
作者:Ohtsuka,Y.、Tahara,A.
DOI:——
日期:——
Antifungal Application of Rosin Derivatives from Renewable Pine Resin in Crop Protection
作者:Pan Tao、Chengyu Wu、Jin Hao、Yanqing Gao、Xiaohua He、Jian Li、Shibin Shang、Zhanqian Song、Jie Song
DOI:10.1021/acs.jafc.0c00562
日期:2020.4.8
metabolism. Furthermore, QSAR and SAR studies revealed that charge distribution of rosin-based amides derivatives have a key role in the antifungalactivity through the hydrogen bonding, conjugation, and electrostatic interaction between the compounds and the receptors of the target. To sum up, this study contributes to the development of rosin-based antifungal agents with a novel structure and preferable