against cellular proliferation and tubulin polymerization. In particular, monomethoxylated derivatives of phenstatin and isoCA-4 exhibit similar activities to those of parent phenstatin. Attempts of the Wittig reaction on 2- (or 4-) methoxy-4′-nitrobenzophenones in the same conditions do not lead to the expected isocombretastatins but to methyleneketones with the exclusion of triphenylphosphine. A mechanism
在t BuOK存在下,通过使相应的phenstatin类似物与CH 3 PPh 3 Br反应,合成了新的异combretastatin 。这些新的衍
生物显示出对细胞增殖和微管蛋白聚合的显着活性。尤其是,phenstatin和iso
CA-4的单甲氧基化衍
生物表现出与母体phenstatin相似的活性。在相同条件下对2-(或4-)甲氧基-4'-硝基
二苯甲酮进行Wittig反应的尝试不会导致预期的异combretastatins,但会导致亚甲基酮,但不包括
三苯基膦。提出了这种新的酮同系物的机制。