Synthesis and biological evaluation of paclitaxel analogs modified in ring C
作者:Xian Liang、David G.I. Kingston、Chii M. Lin、Ernest Hamel
DOI:10.1016/0040-4039(95)00431-b
日期:1995.4
Both 7-deoxy-7 alpha-azidopaclitaxel (6) and 7-deoxy-Delta(6,7)-paclitaxel (4) can be prepared from paclitaxel-7-0-triflate (2b). Oxidation of 7-deoxy-Delta(6,7)-paclitaxel with dioxirane yields the epoxide 7, while oxidation with osmium tetroxide yields 6 alpha-hydroxy-7-epipaclitaxel (9), and acylation of this gives the 6 alpha-acyloxy-7-epipaclitaxel derivatives 11a-d. No compound was as effective at promoting tubulin assembly as paclitaxel, but most stabilized polymer as well as or better than paclitaxel. Compounds 4, 6, 7, 9, and 11d differed little from paclitaxel in their cytotoxicity for human Burkitt lymphoma CA46 cells.