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- ( hydroxymethyl ) propoxy ] derivatives of guanine , 2-amino-6-chloropurine , 2-amino-6-alkoxypurines , 2-aminopurine , 2,6-diaminopurine , adenine , hypoxanthine , and 6-methoxypurine ( 8 , 12 , 13 , 19-21 , 23-26 , 34 , 37-39 ) .
C0000263
2-aminopurine
C0001407
adenine