Synthesis of new spin probes based on aminoaryl-substituted imidazoline nitroxides
作者:V. A. Reznikov、T. A. Berezina、I. A. Kirilyuk、L. B. Volodarskii
DOI:10.1007/bf01169720
日期:1994.3
A series of newspin probes, azides and isothiocyanates, were synthesized starting from aminoaryl-substituted nitroxides which are derivatives of 3-imidazoline and 3-imidazoline-3-oxide. The new compounds were transformed to complexones, derivatives of iminodiacetic acid.
Convenient and rapid diazotization and diazo coupling reaction via aryl diazonium nanomagnetic sulfate under solvent-free conditions at room temperature
acid is used for conversion of several types of aromatic amine, containing electron-withdrawing groups as well as electron-donating groups to the corresponding azo dyes in excellent yield. The synthesis of these compounds is described by the sequential diazotization–diazo coupling of various aromatic amines with sodium nitrite, nanomagnetic supported sulfonic acid and coupling agents under solvent-free
Described are phosphoramidite nucleoside analog monomers, precursors thereof, and oligonucleotides including one or more of the monomers. The monomers can be used during automated synthesis of oligonucleotide derivatives, and allow for incorporation of one or several reporter groups, organic molecules, bio-molecules, small molecules or other chemical groups at the internucleoside phosphotriesters. Oligonucleotides including the monomers have a number of uses in therapeutic, diagnostic, and research applications.
Fluorescence Quenchers for Hydrazone and Oxime Orthogonal Bioconjugation
作者:Pete Crisalli、Armando R. Hernández、Eric T. Kool
DOI:10.1021/bc300344b
日期:2012.9.19
We describe the synthesis and properties of new fluorescence quenchers containing aldehyde, hydrazine, and aminooxy groups, allowing convenient bioconjugation as oximes or hydrazones. Conjugation to oligonucleotides proceeded in high yield with aniline as catalyst. Kinetics studies of conjugation show that, under optimal conditions, a hydrazine or aminooxy quencher can react with aldehyde-modified DNA to form a stable hydrazone or oxime adduct in as little as five minutes. The resulting quencher-containing DNAs were assessed for their ability to quench the emission of fluorescein in labeled complements and compared to the commercially available dabcyl and Black Hole Quencher 2 (BHQ2), which were conjugated as phosphoramidites. Results show that the new quenchers possess slightly different absorbance properties compared to dabcyl and are as efficient as the commercial quenchers in quenching fluorescein emission. Hydrazone-based quenchers were further successfully incorporated into molecular beacons and shown to give high signal to background ratios in single nucleotide polymorphism detection in vitro. Finally, aminooxy and hydrazine quenchers were applied to quenching of an aldehyde-containing fluorophore associated with living cells, demonstrating cellular quenching within one hour.
Torrey; Mc Pherson, Journal of the American Chemical Society, 1909, vol. 31, p. 582