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Intramolecular cyclization of 6-amino-5-[2-substituted-2-(cyanovinyl)]amino-1,3-dimethyluracil: synthesis of 9-deazaxanthine derivatives and 8-(cyanomethyl)theophylline.
Yoshihisa Okamoto, Kaname Takagi, Atsushi Takada, Takeo Ueda.
- DOI:
http://dx.doi.org/10.1021/jo00179a029