Tyrosine Kinase Inhibitors. 12. Synthesis and Structure−Activity Relationships for 6-Substituted 4-(Phenylamino)pyrimido[5,4-<i>d</i>]pyrimidines Designed as Inhibitors of the Epidermal Growth Factor Receptor
作者:Gordon W. Rewcastle、Alexander J. Bridges、David W. Fry、J. Ronald Rubin、William A. Denny
DOI:10.1021/jm960879m
日期:1997.6.1
the enhanced potency shown by 6-N-methylated derivatives in each series. X-ray crystal structures were determined for the three NHMe derivatives 2, 3, and 5c in the pyrido[9,2-d]-, pyrido[3,4-d]-, and pyrimido[5,4-d]-pyrimidine series, respectively. These show that a carbon rather than a nitrogen atom at the 5-position leads to significant conformational changes in the molecule (a longer C5a-C4 bond
已经制备了一系列6-取代的4-苯胺基嘧啶基[5,4-d]嘧啶,它们是表皮生长因子受体(EGFR)酪氨酸激酶活性的有效抑制剂。这些化合物在结构上与先前显示为EGFR抑制剂的吡啶并[3,2-d]-和吡啶并[3,4-d]-嘧啶相关。它们与抑制[3,2-d]的结构-活性关系(SAR)比[3,4-d]嘧啶嘧啶的异构体更接近[3,2-d]。这表明对于每个系列中的6-N-甲基化衍生物所显示的增强的效力,需要在7位而不是5位上的氮杂原子(即,在5位上的碳原子)。确定了吡啶并[9,2-d]-,吡啶并[3,4-d]-和嘧啶并[5,4-d]-中三个NHMe衍生物2、3和5c的X射线晶体结构嘧啶系列 分别。这些表明,由于需要,在5位上的碳原子而不是氮原子会导致分子中显着的构象变化(更长的C5a-C4键和苯基的平面外旋转30度)以减轻C5和N9质子之间的非键相互作用 带有笨重,弱碱性的可溶侧链的仲嘧啶并[5,4-d