Synthesis and Biological Evaluations of 3-Benzothiazol-2-yl Coumarin Derivatives as MEK1 Inhibitors
作者:Chao Wang、Fengrong Xu、Yan Niu、Yun Wu、Jing Sun、Yihong Peng、Lei Liang、Ping Xu
DOI:10.2174/15701808113109990012
日期:2013.8.1
In order to discover novel MEK inhibitors, a series of 3-(benzothiazol-2-yl) coumarin derivatives have been
synthesized following our earlier study of 3-benzyl coumarin derivatives. The target compounds were obtained by condensation,
cyanation, hydrolyzation and esterification starting from o-hydroxy benzaldehydes and benzothiazole-2-
acetonitrile. The cyanation reaction could only occur when there were electron with drawing groups at C3 position of coumarin
scaffold. All the synthesized compounds showed weak binding and inhibition potencies to phosphorylated MEK1
but obvious inhibitory effect to unphosphorylated MEK1, suggesting that compounds inhibition to MEK1 is mainly due to
the inhibition of npMEK1 rather than pMEK1. The most potent compound 3 was with an inhibition rate of 60.7% at 1 μM
in the RAF-MEK cascading assay. Molecular docking studies revealed that the pocket occupation and structure hydrophobicity
may be important for activity. These results can contribute to further optimization on coumarin scaffold and led
to the design of novel coumarin derivatives as more potent MEK1 inhibitors.
为了发现新型MEK抑制剂,一系列3-(苯并噻唑-2-基)香豆素衍生物被研究
根据我们早期对 3-苄基香豆素衍生物的研究合成的。经缩合得到目标化合物,
以邻羟基苯甲醛和苯并噻唑-2-为原料进行氰化、水解和酯化
乙腈。氰化反应只有在香豆素C3位有带拉基的电子时才能发生
脚手架。所有合成的化合物均对磷酸化 MEK1 表现出较弱的结合和抑制能力
但对未磷酸化的MEK1有明显的抑制作用,提示化合物对MEK1的抑制主要是由于
抑制 npMEK1 而不是 pMEK1。最有效的化合物 3 在 1 μM 时抑制率为 60.7%
在 RAF-MEK 级联测定中。分子对接研究表明口袋占据和结构疏水性
可能对活动很重要。这些结果有助于进一步优化香豆素支架和LED
设计新型香豆素衍生物作为更有效的 MEK1 抑制剂。