- Improved synthesis of 4-amino-7-nitrobenz-2,1,3-oxadiazoles using NBD fluoride (NBD-F)
-
The 7-nitrobenz-2,1,3-oxadiazole (NBD) unit is a highly useful fluorescent tag with wide application in biology. Installation of the NBD group typically proceeds via the SNAr reaction between an amine and an NBD halide. Herein, we demonstrate that NBD-F 1 results in significantly higher yields than NBD-Cl 2, and that triethylamine in dimethylformamide at 23 °C overnight is a broadly applicable set of conditions for this reaction. In particular, the highly useful fluorescent carbohydrate 2-NBD-glucosamine (2-NBDG, 3) can now be prepared in 75% yield with NBD-F as compared to 12% with NBD-Cl.
- Jung, Michael E.,Dong, Timothy A.,Cai, Xiaolu
-
body text
p. 2533 - 2535
(2011/06/21)
-
- HETEROCYCLIC COMPOUNDS HAVING AN OXADIAZOLE MOIETY AND HYDRO ISOMERS THEREOF
-
The present invention relates to substituted diphenyl heterocycle compounds having an oxadiazole moiety and pharmaceuticals compositions thereof that inhibit replication of HCV virus. The present invention also relates to the use of the compounds and/or compositions to inhibit HCV replication and/or proliferation and to treat or prevent HCV infections.
- -
-
Page/Page column 62-63
(2008/06/13)
-
- PRESSURE EFFECT ON DIMERIZATION EQUILIBRIA OF A SERIES OF SUBSTITUTED NITROSOBENZENES IN SOLUTION.
-
The effect of pressure was studied on the dimerization reactions of six di- and tri-substituted nitrosobenzenes in carbon tetrachloride at 25 degree C. The obtained configurational volume changes for the prototype one bond formation reactions are in the range of minus 17 to minus 21 cm**3 mol** minus **1 at 6. 13 MPa. The volume changes were interpreted in terms of the perturbation theory of liquid; they were dominated by the volume change in the reference system composed of hard spheres. Small differences between the observed and theoretical reference volume changes were ascribed to the perturbation due to electrostatic interactions between the solute and solvent; the perturbation volume changes were estimated by the Kirkwood theory of dipolar solvation.
- Yoshimura,Nakahara
-
-
- OXIDATION OF HYDRAZINES WITH NITROSOBENZENES
-
Nitrosoarenes react with 1,1-disubstituted hydrazines to yield products of direct oxidation and the thermally stable triazene N-oxides.The triazene N-oxides undergo photoinduced fragmentation to yield products which may be rationalized through the interme
- Kano, Kunio,Koga, Masahiro,Anselme, Jean-Pierre
-
p. 137 - 144
(2007/10/02)
-