2-Amino-6-chloropurine (1) was reacted with 2-bromoethyl acetate to yield 9-acetoxyethyl-2-amino-6-chloro-purine (2), which was treated with NBS to afford 9-acetoxyethyl-2-amino-8-bromo-6-chloropurine (3). 3 was reacted with sodium methanol to afford 2-amino-6-chloro-9-(2-hydroxyethyl)-8-methoxypurine (4), and then 4 was treated with acetic anhydride to yield 9-acetoxyethyl-2-amino-6-chloro-8-methoxypurine (5). After that 5 was diazotized and reacted with dialkyl disulfide to yield 9-acetoxyethyl-2-alkylthio-6-chloro-8-methoxypurine (6) and 6 was treated with amine to afford 9-acetoxyethyl-6-alkylamino-2-alkylthio-8-methoxypurine (7). Deprotection of hydroxyl group in compound 7 provided target compound 8. All 24 novel compounds 3～8 were acquired and their structures were identified by 1H NMR, 13C NMR, IR and HRMS techniques. Besides, the anti-platelet aggregation activities of the nine target compounds were tested.

Key words: purine derivatives, synthesis, characterization, anti-platelet aggregation