Facile synthesis of 6-cyano-9-substituted-9H-purines and their ring expansion to 8-(arylamino)-4-imino-3-methylpyrimidino[5,4-d]pyrimidines.
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R. A. Carpenter | M. F. Proença | Amal Al‐Azmi | R. Pritchard | B. Booth | Alice Carvalho | Elodie Marrelec