Recently, we have demonstrated that the photogeneration of Vilsmeier-Haack reagents is possible using only dimethylformamide (DMF) and tetrabromomethane (CBr4) in the bromination of alcohols. Extending these findings to carboxylic acid substrates has produced a mild and facile approach to the in situ formation of symmetric anhydrides, which were conveniently converted to amide derivatives in a one-pot process. The efficient protocols discussed herein are marked by use of UVA LEDs (365 nm), which have reduced the reaction times and come with a low setup cost.
sensitivity to U87cells with IC50 values ranging from 173 to 2 nM. Moreover, most compounds produced high levels of NO in vitro, and the antitumor activity of 11a in U87cells was markedly attenuated by an NO scavenger (hemoglobin or carboxy-PTIO). Further mechanism studies revealed that 11a caused the G2 phase arrest of the cell cycle and induced apoptosis of U87cells by preventing the activation of the
Characterization of Novel Aminobenzylcantharidinimides and Related Imides by Proton NMR Spectra and Their Effects on NO Induction
作者:Ing-Jy Tseng、Pen-Yuan Lin、Shiow-Yunn Sheu、Wan-Ni Tung、Ching-Tung Lin、Mei-Hsiang Lin
DOI:10.1002/jccs.201400228
日期:2015.1
0032) to produce cantharidinimides and their analogues in good yields. The para‐aminobenzylic imides showed greater inhibition of nitric oxide (NO) synthesis by NO synthase (NOS) than did ortho‐ and meta‐aminobenzylic imides. Compound 3fp, para‐aminobenzylic norbonane‐imide, had the most potent effect on inducible NOS among the tested compounds and showed 35% inhibition.
dosage of H2S release was also recorded. Hence, A1 was most suitable for mechanistic exploration on account of both safety and efficacy. The ensuing biological assays revealed central role of apoptosis in A1’s mode of action for antiproliferative efficacy, which led to further confirmation of G1 phase cell cycle arrest, mitochondria membrane potential collapse and apoptotic activation in Bel-7402 cells
The present invention provides a (di)azaindole derivative represented by the formula (I). A compound of the present invention inhibits a Cdc7 protein kinase activity and suppresses cell proliferation.
Structure–activity relationships of galabioside derivatives as inhibitors of E. coli and S. suis adhesins: nanomolar inhibitors of S. suis adhesins
作者:Jörgen Ohlsson、Andreas Larsson、Sauli Haataja、Jenny Alajääski、Peter Stenlund、Jerome S. Pinkner、Scott J. Hultgren、Jukka Finne、Jan Kihlberg、Ulf J. Nilsson
DOI:10.1039/b416878j
日期:——
Four collections of Galα1-4Gal derivatives were synthesised and evaluated as inhibitors of the PapG class II adhesin of uropathogenic Escherichia coli and of the PN and PO adhesins of Streptococcus suis strains. Galabiosides carrying aromatic structures at C1, methoxyphenyl O-galabiosides in particular, were identified as potent inhibitors of the PapG adhesin. Phenylurea derivatisation at C3â² and methoxymethylation at O2â² of galabiose provided inhibitors of the S. suis strains type PN adhesin with remarkably high affinities (30 and 50 nM, respectively). In addition, quantitative structureâactivity relationship models for E. coli PapG adhesin and S. suis adhesin type PO were developed using multivariate data analysis. The inhibitory lead structures constitute an advancement towards high-affinity inhibitors as potential anti-adhesion therapeutic agents targeting bacterial infections.
合成并评估了四种Galα1-4Gal衍生物作为产尿致病大肠杆菌PapG II类粘附素及链球菌豚型(Streptococcus suis)PN和PO粘附素的抑制剂。具有芳香结构的半乳糖双糖,特别是含有甲氧基苯基的O-半乳糖双糖,被确定为PapG粘附素的强效抑制剂。在半乳糖双糖的C3'位进行苯基脲衍生化,以及在O2'位进行甲氧基甲基化,提供了对S. suis PN型粘附素具有显著高亲和力的抑制剂(分别为30和50 nM)。此外,利用多变量数据分析方法建立了针对大肠杆菌PapG粘附素和S. suis PO型粘附素的定量构效关系模型。这些抑制剂的领先结构为开发高亲和力的潜在抗粘附治疗剂以靶向细菌感染提供了进展。