作者:Tokumi Maruyama、Shigetada Kozai、Fumi Sasaki
DOI:10.1080/15257770008035040
日期:2000.7
A general procedure to obtain tetra-substituted uric acid by stepwise N-alkylation is described. 2,6-Dichloropurine (1) was condensed with 1-propanol by Mitsunobu reaction to give 9-propyl congener (2). Treatment of 2 with ammonia gave adenine derivative (4a), which was converted to the 8-oxoadenine (5b) in 3 steps. Methylation of 5b proceeded site-specifically to give 6-amino-2-chloro-7,8-dihydro
描述了通过逐步N-烷基化获得四取代尿酸的一般程序。通过Mitsunobu反应将2,6-二氯嘌呤(1)与1-丙醇缩合,得到9-丙基同源物(2)。用氨处理2得到腺嘌呤衍生物(4a),其经3步转化为8-氧代腺嘌呤(5b)。5b的甲基化位点特异性进行,得到6-氨基-2-氯-7,8-二氢-7-甲基-9-丙基嘌呤-8-(6)作为唯一产物。将化合物6依次用NaNO 2和碘甲烷处理,得到2-氯-1,6,7,8-四氢-1,7-二甲基-9-丙基嘌呤-6,8-二酮(9)以及O6-甲基产物(8)分别为75%和6.9%。用NaOAc亲核取代9后,产物(11)与碘甲烷反应,分别得到46%和15.5%的尿酸(12)和2-甲氧基产物(13)。然而,