developed. 1-(2-Hydroxyphenyl)-3-phenylpropane-1,3-diones were fluorinated using selectfluor with a small amount of CH3CN at room temperature, followed by cyclization and dehydration in the presence of a trace amount of conc. H2SO4 to provide 3-fluoroflavones. The desired 3-fluoroflavone analogues were obtained in moderate to excellent yields. This strategy tolerated a wide range of functional groups and
开发了一种简洁高效的一锅法合成3-氟黄酮。在室温下,使用带有少量CH 3 CN的selectfluor对1-(2-羟基苯基)-3-苯基丙烷-1,3-二酮进行氟化,然后在痕量浓盐酸存在下进行环化和脱水。H 2 SO 4提供3-氟黄酮。以中等至优异的产率获得了所需的3-氟黄酮类似物。该策略可耐受各种官能团,不需要复杂的仪器或繁琐的底物制备。
Rh-Catalyzed Asymmetric Hydrogenation of 2-Substituted 4H-(Thio)chromenes for Synthesis of Chiral (Thio)chromanes
Rh-catalyzed asymmetric hydrogenation of 2-substituted 4H-thiochromenes and 4H-chromenes was successfully developed. This method provided highly efficient access to a series of chiral 2-substituted thiochromanes and chromanes in high yields with excellent enantioselectivities (up to 99% yield, 86–99% ee). The obtained chiral 2-substituted thiochromane products were also successfully transformed to
Cu(II)-catalyzed oxidative esterification of 2-carbonyl substituted phenols from the alcohol oxidation level
作者:Satyasheel Sharma、Jihye Park、Mirim Kim、Jong Hwan Kwak、Young Hoon Jung、In Su Kim
DOI:10.1016/j.tet.2013.08.079
日期:2013.11
A copper-catalyzed oxidative esterification of 2-carbonyl substituted phenols from the alcohol oxidation level is described. This protocol represents direct access to a range of 2-carbonylated aryl benzoate derivatives, which are important building blocks in the synthesis of natural and pharmacological compounds. (C) 2013 Elsevier Ltd. All rights reserved.
Decoupling Activation of Heme Biosynthesis from Anaerobic Toxicity in a Molecule Active in <i>Staphylococcus aureus</i>
作者:Brendan F. Dutter、Laura A. Mike、Paul R. Reid、Katherine M. Chong、Susan J. Ramos-Hunter、Eric P. Skaar、Gary A. Sulikowski
DOI:10.1021/acschembio.5b00934
日期:2016.5.20
Small molecules active in the pathogenic bacterium Staphylococcus aureus are valuable tools for the study of its basic biology and pathogenesis, and many molecules may provide leads for novel therapeutics. We have previously reported a small molecule, 1, which activates endogenous heme biosynthesis in S. aureus, leading to an accumulation of intracellular heme. In addition to this novel activity, 1 also exhibits toxicity towards S. aureus growing under fermentative conditions. To determine if these activities are linked and establish what features of the molecule are required for activity, we synthesized a library of analogs around the structure of 1 and screened them for activation of heme biosynthesis and anaerobic toxicity to investigate structure activity relationships. The results of this analysis suggest that these activities are not linked. Furthermore, we have identified the structural features that promote each activity and have established two classes of molecules: activators of heme biosynthesis and inhibitors of anaerobic growth. These molecules will serve as useful probes for their respective activities without concern for the off target effects of the parent compound.