Aryl and heteroaryl compounds, compositions, and methods of use
申请人:Mjalli M.M. Adnan
公开号:US20050059713A1
公开(公告)日:2005-03-17
This invention provides aryl and heteroaryl compounds of Formula (I) as described herein, and methods of their preparation. Also provided are pharmaceutical compositions made with the compounds of Formula (I) and methods for making such compositions. Compounds of Formula (I) may be useful for treating viral infections including orthopox viruses, either alone or in combination with other therapeutic agents.
The palladium catalyzed cross-coupling reaction of aryl halides with aryl(halo)silanes (halogen= F, Cl) gives good yields of unsymmetrical biaryls and p-terphenyls. The reaction takes place smoothly in N,N-dimethylformamide in the presence of an appropriate palladium catalyst and potassium fluoride. Since this reaction is tolerant of a variety of reactive functional groups, highly functionalized 4,4'-, 3,4'-, 2,4'- and even sterically crowded 2,2'-disubstituted biaryls can be obtained in moderate to high yields. The synthetic utility of the method has been demonstrated by its application to a short synthesis of liquid crystals. Mechanistic aspects of transmetalation of an aryl(fluoro)silicate intermediate with a palladium complex are discussed on the basis of the substituent effects on the rate of the cross-coupling reactions.
HATANAKA, YASUO;FUKUSHIMA, STASOHI;HIYAMA, TAMEJIRO, CHEM. LETT.,(1989) N0, C. 1711-1714