Reaction of alkenoxyamines (3, 5) or (R, S)-,(R)-, and (S)-hydroxy-protected derivatives of hydroxyalkoxyamines (20a, b, 37a-c) with 4, 6-dichloro-2, 5-diformamidoppimidine (4) and cyclization of the resultant 6-[(alkenoxy) amino]-and 6-(alkoxyamino) pyrimidines (6, 7, 21a, b, 38a, b, c) by heating with diethoxymethyl acetate afforded 9-alkenoxyand 9-alkoxy-6- chloropurines (9, 10, 22a, b, 39a-c, 4Oa). These were subsequently converted to 9-(2, 3- ...