Synthesis and biological evaluation of 5-substituted O4-alkylpyrimidines as CDK2 inhibitors
作者:Francesco Marchetti、Céline Cano、Nicola J. Curtin、Bernard T. Golding、Roger J. Griffin、Karen Haggerty、David R. Newell、Rachel J. Parsons、Sara L. Payne、Lan Z. Wang、Ian R. Hardcastle
DOI:10.1039/b925481a
日期:——
CDK2 inhibitory structure–activity relationships have been explored for a range of 5-substituted O4-alkylpyrimidines. Variation of the 5-substituent in the 2,6-diaminopyrimidine series confirmed the 5-nitroso substituent as optimal, and showed that 5-formyl and 5-acetyl substituents were also tolerated at this position. A series of O4-alkyl-N2-aryl-5-substituted-6-aminopyrimidines revealed interesting structure–activity relationships. In the 5-nitroso series, the optimum O4-alkyl substituents were cyclohexylmethyl or sec-butyl, combined with a 2-sulfanilyl group. By contrast, in the N2-arylsulfonamido-5-formyl series, the cyclohexylmethyl compound showed relatively poor activity compared with the sec-butyl derivative (22j, (R)-4-(4-amino-6-sec-butoxy-5-formylpyrimidin-2-ylamino)benzenesulfonamide; CDK2 IC50 = 0.8 nM). Similarly, in the N2-arylsulfonamido-5-(hydroxyiminomethyl) series the O4-sec-butyl substituent conferred greater potency than the cyclohexylmethyl (23c, (rac)-4-(4-amino-6-sec-butoxy-5-(hydroxyiminomethyl)pyrimidin-2-ylamino)benzenesulfonamide; CDK2 IC50 = 7.4 nM). The 5-formyl derivatives show selectivity for CDK2 over other CDK family members, and are growth inhibitory in tumour cells (e.g.22j, GI50 = 0.57 μM).
我们对一系列 5-取代的 O4-烷基嘧啶的 CDK2 抑制结构-活性关系进行了探索。在 2,6-二氨基嘧啶系列中,5-取代基的变化证实了 5-亚硝基取代基是最佳的,并表明 5-甲酰基和 5-乙酰基取代基在该位置上也是可以容忍的。一系列 O4-烷基-N2-芳基-5-取代的 6-氨基嘧啶揭示了有趣的结构-活性关系。在 5-亚硝基系列中,最佳的 O4-烷基取代基是环己基甲基或仲丁基,再加上一个 2-甲磺酰基。相比之下,在 N2-芳基磺酰胺-5-甲酰基系列中,环己基甲基化合物的活性相对低于仲丁基衍生物(22j,(R)-4-(4-氨基-6-仲丁氧基-5-醛基嘧啶-2-基氨基)苯磺酰胺;CDK2 IC50 = 0.8 nM)。同样,在 N2-芳基磺酰胺-5-(羟基亚氨基甲基)系列中,O4-仲丁基取代基比环己基甲基取代基具有更强的效力(23c,(rac)-4-(4-氨基-6-仲丁氧基-5-(羟基亚氨基甲基)嘧啶-2-基氨基)苯磺酰胺;CDK2 IC50 = 7.4 nM)。5- 甲酰基衍生物对 CDK2 的选择性高于 CDK 家族的其他成员,对肿瘤细胞具有生长抑制作用(例如 22j,GI50 = 0.57 μM)。