1,3-alkylsubstituted-8-(3,4-,3- or 4-substituted phenyl)xanthines and pharmaceutically acceptable salts of such compounds are disclosed. The 3-substituents are hydrogen, dimethylaminomethyl, or 2,3-dihydroxypropyloxy. The 4-substituents are selected from hydroxy, cyano, --NHCON(R.sub.5).sub.2, --C(.dbd.NH)N(R.sub.5).sub.2, --NH--C(.dbd.NH)N(R.sub.5).sub.2, with each R.sub.5 independently being hydrogen or an alkyl group of one to three carbons and provided that when the 3-substituent is hydrogen the 4-substituent is not hydroxy or hydrogen. The compounds are potent adenosine receptor antagonists having relatively low lipophilicity. The compounds are intended for use as bronchodilators and cardiotonics.
Smooth Metal‐Free Photoinduced Preparation of Valuable 8‐Arylxanthines
作者:Havall Othman Abdulla、Ahmed A. Amin、Carlotta Raviola、Till Opatz、Stefano Protti、Maurizio Fagnoni
DOI:10.1002/ejoc.201900638
日期:2020.3.15
A set of 8‐arylxanthines was prepared under metal‐free conditions and in aqueous solvents from arylazosulfones and caffeine or theophylline. Notably, the process took place by simply exposing the reaction vessel to visible or solar light, and unreacted xanthine could be easily recovered during the purification step.