Reaction of hydroxyl-protected derivatives of hydroxyalkoxyamines (3a, b, c) with either 4, 6- dichloro-2, 5-diformamidopyrimidine (5) or 4, 6-dichloro-5-formamidopyrimidine (31) and subsequent cyclization of the resultant 6-(alkoxyamino) pyrimidines (6, 17, 32, 35) by heating with diethoxymethyl acetate afforded 9-alkoxy-6-chloropurines (7, 18, 33, 36), which were converted subsequently to 9-(3-hydroxypropoxy)-and 9-[3-hydroxy-2-(hydroxy- ...
[Kim, Dae-Kee; Gam, Jongsik; Kim, Young-Woo; Lim, Jinsoo; Kim, Hun-Taek; Kim, Key H. Journal of Medicinal Chemistry, 1997 , vol. 40, # 15 p. 2363 - 2373]