M. Jokic et al., The synthesis of novel 6,5-and 6,6-membered fused heterocyclic compounds derived from thymine, NUCLEOS NUC, 19(9), 2000, pp. 1381-1396
Novel pyrimido[1,2-a]pyrimidinones 14, 15 and 16 and imidazo[1,2-a] pyrimid
inones 19 and 20, designed as conformationally constrained analogues of 1-(
3-amino-2-hydroxypropyl)thymine and 1-(2-amino-3-hydroxypropyl)thymine, res
pective ly, were synthesized by the ring-opening/ ring-closure rearrangemen
t of the corresponding byciclic oxygen-containing amino compounds 12 and 17
.