Antitumor agents—CLXXV. Anti-tubulin action of (+)-thiocolchicine prepared by partial synthesis
作者:Qian Shi、Pascal Verdier-Pinard、Arnold Brossi、Ernest Hamel、Kuo-Hsiung Lee
DOI:10.1016/s0968-0896(97)00171-5
日期:1997.12
(+)-Thiocolchicine (2b) was prepared from (+/-)-colchicine (1) in a five-step reaction sequence that included chromatographic separation of appropriate camphanylated diastereomers. Acid hydrolysis of the (+)-diastereomer, followed by acetylation, yielded the desired product 2b. (+)-Thiocolchicine has 15-fold lower inhibitory activity against tubulin polymerization than (-)-thiocolchicine, and is 29-fold less potent for inhibiting growth of human Burkitt lymphoma cells. The enantiomer 2a, prepared from the (-)-camphanylated diastereomer, had potent activity in all assays comparable to that of (-)-thiocolchicine prepared by other methods. These results support the hypothesis that the proper configuration of colchicine-related compounds is an important requirement for their anti-tubulin action. (C) 1997 Elsevier Science Ltd.
(+)-硫秋水仙素(2b)由(+/-)-秋水仙素(1)经过五步反应制得,其中包括对合适樟脑化衍生物的色谱分离。对(+)-立体异构体进行酸水解,随后乙酰化,得到目标产物2b。与(-)-硫秋水仙素相比,(+)-硫秋水仙素对微管聚合的抑制活性低15倍,且对人骨髓瘤细胞生长的抑制效力低29倍。由(-)-樟脑化立体异构体制备的对映体2a,在所有测定中的活性均与采用其他方法制备的(-)-硫秋水仙素相当。这些结果支持以下假设:秋水仙素相关化合物的正确构型是其抗微管作用的重要要求。 (C) 1997 Elsevier Science Ltd.