Substitution directe de l'azote N‐9 de la théophylline

1985 
La bis (chloro-2 ethyl)amino-8 theophylline (1) se cyclise en milieu alcalin en deux imidazo-purines: une imidazo[1,2-e]purine 2A (cyclisation en N-9) et une imidazo[2,1-f]purine 2B (cyclisation en N-7). La structure de chaque compose a ete determined par spectrographie et confirmee par synthese univoque. La synthese d'une pyrrolo[2,1-f]purine, nouvel heterocycle, est decrite. In alkaline medium, 8-(2-chloroethyl)aminotheophylline (1) cyclizes into two imidazopurines: the imidazo[1,2-e]purine (2A) (cyclization on 9-N) and the imidazo[2,1-f]purine (2B) (cyclization on 7-N). The structure of each compound was determined by an unambiguous synthesis and confirmed by spectrographic methods. Synthesis of one pyrrlo[2,1-f]purine, a novel heterocycle, is described.
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