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[摘要]：17 beta-Hydroxysteroid dehydrogenase type 1 (17 beta-HSD1) represents a promising therapeutic target for breast cancer treatment. To reduce the undesirable estrogenic activity of potent 17 beta-HSD1 inhibitor 16 beta-(m-carbamoylbenzyl)estradiol (1) (IC(50) = 27 nM), a series of analogues with a small functionalized side chain at position 3 were synthesized and tested. The 3-(2-bromoethyl)-16 beta-(m-carbamoylbenzy1)-estra-1,3,5(10)-trien-17 beta-ol (5) was found to be a potent inhibitor (IC(50) = 68 nM) for the transformation of estrone (E1) into estradiol (E2) and, most importantly, did not stimulate the proliferation of estrogen-sensitive MCF-7 cells, suggesting no estrogenic activity. From these results, the crucial role of a bromoalkyl side chain at carbon 3 was identified for the first time. Thus, this new inhibitor represents a good candidate with an interesting profile suitable for further studies including pharmacokinetic and in vivo studies. |
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