Microwave Promoted Synthesis of 4,7-Dihydro-1H-imidazo[4,5-e]-1,2,4-triazepin-8-ones as Ring-expanded Hypoxanthine Analogues - Raboisson, Pierre; Norberg, Bernadette; Casimir, J Richard; Bourguignon, Jean-Jacques (Synlett, 2002)