Synthesis of 5-aryl-3-C-glycosyl- and unsymmetrical 3,5-diaryl-1,2,4-triazoles from alkylidene-amidrazones
作者:Béla Szőcs、Éva Bokor、Katalin E. Szabó、Attila Kiss-Szikszai、Marietta Tóth、László Somsák
DOI:10.1039/c5ra05702g
日期:——
Bromination of the so obtained compounds by NBS gave hydrazonoyl bromide type derivatives which were ring closed to 3-C-glycosyl-5-substituted-1,2,4-triazoles in pyridine or by NH4OAc in AcOH. Under the same conditions O-perbenzoylated N1-arylidene-C-(β-D-glucopyranosyl)-formamidrazones gave the expected 1,2,4-triazoles as minor products only. N1-Arylidene-arenecarboxamidrazones were also transformed
A series of Zn(ii) complexes with 5-(4-R-phenyl)-3-(pyridin-2-yl)-1,2,4-triazoles have been synthesized and subsequently characterized by single crystal X-ray diffraction, 1H-NMR, FT-IR spectroscopy, elemental analyses, ESI-MS, and PXRD.
1 : 2 : 4-Triazoles. Part I. A synthesis of 3 : 5-disubstituted 1 : 2 : 4-triazoles
作者:K. T. Potts
DOI:10.1039/jr9540003461
日期:——
Multimodal Probes: Superresolution and Transmission Electron Microscopy Imaging of Mitochondria, and Oxygen Mapping of Cells, Using Small-Molecule Ir(III) Luminescent Complexes
作者:Jonathan R. Shewring、Ahmet J. Cankut、Luke K. McKenzie、Bethany J. Crowston、Stanley W. Botchway、Julia A. Weinstein、Elizabeth Edwards、Michael D. Ward
DOI:10.1021/acs.inorgchem.7b02633
日期:2017.12.18
We describe an Ir(III)-basect small-molecule, multi modal probe for use in both light and electron microscopy. The direct correlation of data between light- and electron-microscopy-based imaging to investigate cellular processes at the ultrastructure level is a current challenge, requiring both dyes that must be brightly emissive for luminescence imaging and scatter electrons to give contrast for electron microscopy, at a single working concentration suitable for both methods. Here we describe the use of Ir(III) complexes as probes that provide excellent image contrast and quality for both luminescence and electron microscopy imaging, at the same working concentration. Significant contrast enhancement of cellular mitochondria was observed in transmission electron microscopy imaging, with and without the use of typical contrast agents. The specificity for cellular mitochondria was also confirmed with MitoTracker using confocal and 3D-structured illumination microscopy. These phosphorescent dyes are part of a very exclusive group of transition-metal complexes that enable imaging beyond the diffraction limit. Triplet excited-state phosphorescence was also utilized to probe the O-2 concentration at the mitochondria in vitro, using lifetime mapping techniques.