Controlled stepwise conversion of 2,4,6,8-tetrachloropyrimido[5,4-d]pyrimidine into 2,4,6,8-tetrasubstituted pyrimido[5,4-d]pyrimidines
作者:Northen, Julian S.、Boyle, F. Thomas、Clegg, William、Curtin, Nicola J.、Edwards, Andrew J.、Griffin, Roger J.、Golding, Bernard T.
DOI:10.1039/b102224p
日期:2002.12.17
and C-8, followed by nucleophile 2 at C-2 and C-6) or abac (reaction with nucleophile 1 at C-4 and C-8, nucleophile 2 at C-2 and nucleophile 3 at C-6) or abcd (reaction with nucleophile 1 at C-4, nucleophile 2 at C-8, nucleophile 3 at C-2 and nucleophile 4 at C-6). The use of low temperature, relatively dilute solution and careful addition of the amine nucleophile can control the critical first step
为了合理合成2,4,6,8-四取代的嘧啶[5,4- d ]嘧啶,需要嘌呤 模拟物,连续的亲核取代 2,4,6,8-四氯嘧啶[5,4- d ]嘧啶已被调查。已经设计出反应条件,以产生2,4,6,8-四取代的嘧啶并[5,4- d ]嘧啶,其取代方式表示为abab(与亲核试剂1在C-4和C-8处反应,随后与亲核试剂2反应)在C-2和C-6处)或abac(在C-4和C-8与亲核试剂1反应,在C-2与亲核试剂2反应,在C-6与亲核试剂3反应)或abcd(在C-4与亲核试剂1反应),C-8的亲核试剂2,C-2的亲核试剂3和C-6的亲核试剂4)。使用低温,相对稀释的溶液,并小心添加胺亲核试剂可以控制关键的第一步。产生abcd图案的第三步产生了两种区域异构体,它们的结构特征是1 H NMR以及晶体结构分析。选择的2,4,6,8-四取代的嘧啶[5,4- d ]嘧啶经测试为抑制剂 细胞周期蛋白依赖性激酶1复合物(细胞周期蛋白B