Design, synthesis and evaluation of 2,4-disubstituted pyrimidines as cholinesterase inhibitors
作者:Tarek Mohamed、Praveen P.N. Rao
DOI:10.1016/j.bmcl.2010.04.108
日期:2010.6
A group of 2,4-disubstituted pyrimidine derivatives (7a–e, 8a–e and 9a–d) that possess a variety of C-2 aliphatic five- and six-membered heterocycloalkyl ring in conjunction with a C-4 arylalkylamino substituent were designed, synthesized and evaluated as cholinesterase (ChE) inhibitors. The steric and electronic properties at C-2 and C-4 positions of the pyrimidine ring were varied to investigate
一组具有各种C-2脂族五元和六元杂环烷基环以及一个C-4芳基烷基氨基取代基的2,4-二取代嘧啶衍生物(7a – e,8a – e和9a – d)是设计,合成并评估为胆碱酯酶(ChE)抑制剂。改变嘧啶环的C-2和C-4位的空间和电子性质,以研究其对ChE抑制能力和选择性的影响。结构-活性关系(SAR)研究确定N-苄基-2-硫代吗啉吡喃并咪唑-4-胺(7c)是最有效的胆碱酯酶抑制剂(ChEI),具有IC50 = 0.33μM(乙酰胆碱酯酶,AChE)和2.30μM(丁酰胆碱酯酶,BuChE)。分子模型研究表明,在AChE活性位点内,C-2巯基吗啉取代基朝向阳离子活性位点区域(Trp84和Phe330)取向,而在BuChE活性位点内,其C2取向朝向更靠近活性位点的疏水区域峡谷入口(Ala277)。因此,在嘧啶环的C-2位的空间和电子性质在ChE抑制中起关键作用。