氧化二丁基锡(IV)与邻苯二酚类似物4'-(7-氧杂双环[2,2,1] -5-庚烷-2,3-二羧酸二亚胺)苯甲酸A反应生成配合物[(p -C已经表征的8 H 8 NO 3 -C 6 H 4 -COOBu 2 Sn)2 O] 2(1)和(p -C 8 H 8 NO 3 -C 6 H 4 -COO)2 SnBu 2(2)通过IR和1 H,13 C,119 Sn NMR。已经确定了与大多数其他[(RCOOBu 2 Sn)2 O] 2类似的化合物(1)的单X射线晶体结构分析。二聚体的特征在于Bu 4 Sn 2 O 2单元的中心,两个Bu 2 Sn基团通过桥接氧原子连接。每个锡原子通过来自二丁基部分的两个碳和来自邻苯二酚衍生物的三个氧原子并桥接氧原子采用扭曲的三角双锥体结构。体外测试显示,化合物1和2对P388和HL-60具有高细胞毒性。
Conjugates of podophyllotoxin and norcantharidin as dual inhibitors of topoisomeraseⅡ and protein phosphatase 2A
摘要:
A series of novel conjugates of podophyllotoxin and norcantharidin was designed using association strategy, and synthesized by coupling 4'-demethylepipodophyllotoxin with N-amino acid norcantharimides, and their cytotoxicitiy was evaluated against four human tumor cell lines (A-549, HepG2, HeLa and HCT-8) and normal human diploid fibroblast line WI-38. These compounds exhibited potent cytotoxic effects on tumor cell lines, whereas it was less toxic to WI-38 cells than anticancer drug VP-16 or its parent compound norcantharidin. Furthermore, conjugates 7a, 7c, 7f, 7j, 7k and 7I displayed excellent PP2A inhibition activity with IC50 values of 0.49-9.52 mu M. The most potent compound 7I also exhibited topoisomerasellinhibition activity. In addition, compound 7I induced cell-cycle arrest in the G2/M phase in HepG2 by regulating levels of cyclinB1 and cdc2. (C) 2016 Elsevier Masson SAS. All rights reserved.