The proton sponge–triethylamine tris(hydrogen fluoride) mixture provides a mild and efficient fluorinatingreagent for the selective introduction of a fluorine atom, by halogen exchange, into dichlorodiazines.
Selective fluorination by halogen exchange of chlorodiazines and chloropyridines promoted by the ‘proton sponge’—triethylamine tris(hydrogen fluoride) system
The ‘proton sponge’—triethylamine tris(hydrogen fluoride) mixtures provide a mild and efficient fluorinating reagent to introduce selectively fluorine atoms by halogenexchange into chlorodiazines and chloronitropyridine series.
The present invention relates to 3,8-diaza-bicyclo[4.2.0]oct-3-yl amide derivatives of formula (I), wherein the relative configuration of the diazabicyclooctane moiety is cis; and wherein Ar1, and Ar2 are as described in the description, to their preparation, to pharmaceutically acceptable salts thereof, and to their use as pharmaceuticals, to pharmaceutical compositions containing one or more compounds of formula (I), and especially to their use as orexin receptor antagonists.
The present invention relates to 3,8-diaza-bicyclo[4.2.0]oct-8-yl amide derivatives of formula (I) Formula (I) wherein the relative configuration of the diazabicyclooctane moiety is cis; and wherein Ar1, and Ar 2 are as described in the description, to their preparation, to pharmaceutically acceptable salts thereof, and to their use as pharmaceuticals, to pharmaceutical compositions containing one or more compounds of formula (I), and especially to their use as orexin receptor antagonists.
Elemental fluorine. Part 10.1 Selective fluorination of pyridine, quinoline and quinoxaline derivatives with fluorine–iodine mixtures
作者:Richard D. Chambers、Mandy Parsons、Graham Sandford、Christopher J. Skinner、Malcolm J. Atherton、John S. Moilliet
DOI:10.1039/a809838g
日期:——
Selectivefluorination of a range of pyridine and quinoline substrates to give corresponding 2-fluoro-derivatives can be readily achieved in high yield at room temperature using elemental fluorine–iodine mixtures. Reaction of fluorine with iodine forms, in situ, systems that function like sources of both iodonium and fluoride ions and fluorination of heterocyclic derivatives is suggested to proceed