Intramolecular cyclization of 6-amino-5-[2-substituted-2-(cyanovinyl)]amino-1,3-dimethyluracil: synthesis of 9-deazaxanthine derivatives and 8-(cyanomethyl)theophylline
Intramolecular cyclization of 6-amino-5-[2-substituted-2-(cyanovinyl)]amino-1,3-dimethyluracil: synthesis of 9-deazaxanthine derivatives and 8-(cyanomethyl)theophylline