Effects of 8-phenyl and 8-cycloalkyl substituents on the activity of mono-, di, and trisubstituted alkylxanthines with substitution at the 1-, 3-, and 7-positions
作者:Mah T. Shamim、Dieter Ukena、William L. Padgett、John W. Daly
DOI:10.1021/jm00126a014
日期:1989.6
The effects of 8-phenyl and 8-cycloalkyl substituents on the activity of theophylline, caffeine, 1,3-dipropylxanthine, 1,3-dipropyl-7-methylxanthine, 3-propylxanthine, and 1-propylxanthine at A1 adenosine receptors of rat brain and fat cells and at A2 adenosine receptors of rat pheochromocytoma PC12 cells and human platelets are compared. An 8-phenyl substituent has little effect on the activity of
involves copper-catalyzed intramolecular C–Hamination of benzamidines that possess a uracil moiety and produces variously substituted xanthines generally in good to high yields. This work introduces a new, facile approach to polysubstituted xanthine compounds. Catalytic synthesis of xanthines was achieved in the presence of a copper catalyst. The process involves copper-catalyzed intramolecular C–H amination