Modulation of multidrug resistance in tumor cells by taxinine derivatives
摘要:
Among a series of taxinine (1) and its designed derivatives (2 similar to 33), two taxoids (29 and 33) increased cellular accumulation of vincristine in multidrug-resistant tumor cells more potently than verapamil, while the activities of eight taxoids (11, 14 similar to 16, 22, and 30 similar to 32) were comparable with that of verapamil. These results reveal that some taxinine derivatives are good modifiers of multidrug resistance in tumor cells. (C) 1999 Elsevier Science Ltd. All rights reserved.
Epoxidation of taxinine (1), taxinine A (2), and taxinine derivative 7 with m-chloroperbenzoic acid afforded the α-4(20)-epoxides selectively (α : β = 99 : 1), while epoxidation of taxinine derivatives 7 and 8 with dimethyldioxirane gave the β-4(20)-epoxides predominantly (α : β = 1 : 4∼5). The epoxide orientation was found to be assignable by magnitude of chemical shift differences between the geminal
taxinine(环氧化1),taxinine A(2),和taxinine衍生物7与米,得到氯过苯甲酸的α-4(20) -环氧化物选择性(α:β = 99:1),而taxinine衍生物的环氧化7和8与二甲基二,得到β-4(20) -环氧化物主要(α:β = 1:4〜5)。发现环氧化物的取向可通过1 H NMR光谱中双环环氧质子之间的化学位移差异的大小来确定。1β-羟基浆果赤霉素I的相对立体化学(9通过X射线分析确定具有β-4(20)-环氧部分的),以提供环氧方向的有效分配。
Modulation of multidrug resistance in tumor cells by taxinine derivatives
Among a series of taxinine (1) and its designed derivatives (2 similar to 33), two taxoids (29 and 33) increased cellular accumulation of vincristine in multidrug-resistant tumor cells more potently than verapamil, while the activities of eight taxoids (11, 14 similar to 16, 22, and 30 similar to 32) were comparable with that of verapamil. These results reveal that some taxinine derivatives are good modifiers of multidrug resistance in tumor cells. (C) 1999 Elsevier Science Ltd. All rights reserved.
Sako, Magoichi; Suzuki, Hikokazu; Yamamoto, Noriyuki, Journal of the Chemical Society. Perkin transactions I, 1998, # 3, p. 417 - 421