Studies on tridecaptin B<sub>1</sub>, a lipopeptide with activity against multidrug resistant Gram-negative bacteria
作者:Stephen A. Cochrane、Christopher T. Lohans、Marco J. van Belkum、Manon A. Bels、John C. Vederas
DOI:10.1039/c5ob00780a
日期:——
Tridecaptin B1is a new lipopeptide with activity against Gram-negative bacteria.
Tridecaptin B1是一种针对革兰氏阴性细菌活性的新脂肽。
Development of Highly Potent<scp>D</scp>-Glucosamine-Based Chiral Fluorescent Labeling Reagents and a Microwave-Assisted β-Selective Glycosidation of a Methyl Glycoside Reagent
We synthesized new chiral fluorescence labeling reagents having a 2,3-anthracenedicarboximide group from D-glucosamine, and it was possible to introduce target alcohols at the anomeric positions of the reagents with β-selectivity by glycosidations. Especially, it was possible to use methyl glycoside reagent as a glycosyl donor with a Lewis acid and microwave irradiation, and it gave selectively β-glycoside while the reaction without microwave irradiation gave α- and β-mixed glycosides. Those reagents showed very high chiral discrimination ability, and they made it possible to separate the eight stereoisomers of 4,8,12,16-tetramethylheptadecanol by HPLC after derivatizations.
Enatiomeric Separation of Branched Fatty Acids after Conversion with<i>trans</i>-2-(2,3-Anthracenedicarboximido)cyclohexanol, a Highly Sensitive Chiral Fluorescent Conversion Reagent
作者:Kazuaki AKASAKA、Hiroshi OHRUI
DOI:10.1271/bbb.63.1209
日期:1999.1
(1R,2R)-2-(2,3-Anthracenedicarboximido)cyclohexanol was synthesized as a highly sensitive chiral fluorescent conversion reagent. The diastereomeric derivatives of chiral branched fatty acids that had methyl ethyl chirality from the 2 to 12 position were separated into 2 peaks by reversed-phase HPLC and detected at the 10-15 mole level by fluorometry.
Five-Component Self-Assembly of Cucurbituril-Based Hetero-pseudorotaxanes
作者:Cátia Parente Carvalho、Zoe Domínguez、Cristina Domínguez、Hamdy S. El-Sheshtawy、José Paulo Da Silva、Jesús F. Arteaga、Uwe Pischel
DOI:10.1002/open.201600173
日期:2017.4
induced disassembly of the pseudorotaxanes can be monitored by measuring the fluorescence of the anthracene guest in solution. Mass spectral evidence for the supramolecular assemblies is obtained in the gasphase. The disassembly in the gasphase can be achieved by collision‐induced dissociation leading to the corresponding [2]‐ and [3]pseudorotaxanes.
To establish an effective and concise procedure for determining the concentrations of spermidine and spermine, several functional molecules based on phenolphthalein and two crown loops were constructed. Host 5 with a dimethylamino group showed excellent selectivity for spermidine and spermine among other biogenic amines and high sensitivity compared with basic host 1.