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• W2073917880 abstract "The triarylethylene estrogen mimetic (E, Z)-4-[1-(p-hydroxyphenyl)-2-phenyl-1-butenyl]phenoxyacetic acid (4) represents a novel class of estrogen receptor (ER) ligands which, like tamoxifen (1), can elicit estrogen agonist and antagonist effects, in turn, in nonreproductive and reproductive tissues. Analogues of 4, incorporating structural features shown previously in triarylethylenes to improve ER affinity and estrogen antagonist properties, were prepared with the ultimate aim of identifying substances with improved estrogenicity exclusive of reproductive tissues. Thus, the side chain of 4 was elongated to give oxybutyric acid 13, which was further altered by (a) repositioning of its p-hydroxyl to the neighboring m-position (12) and (b) ethylenic bond reduction (14). Also, the p-hydroxyl group and oxyacetic acid groups of 4 were, in turn, shifted to the neighboring m-positions, affording 8 and 9. Oxybutyric acid analogue 13 had about 2 times the affinity for human ERalpha as 4, and its antiproliferative effect in MCF-7 cells was greater than that of 1. Dihydro analogue 14, which was conformationally similar to cis-13, had very low ER affinity and antiestrogenicity, and m-hydroxy analogue 12 also had reduced ER affinity and potency, but its MCF-7 cell antiproliferative efficacy was retained. Modest ER affinity and antiproliferative potency were seen with 8, in which phenolic and phenyl rings were trans to one another, but 9, in which these rings were cis, was inactive. Our findings indicate that two-carbon side-chain elongation and/or m-positioning of the hydroxyl group in 4 affords analogues with dominant estrogen antagonist effects in MCF-7 cells." @default.
• W2073917880 created "2016-06-24" @default.
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• W2073917880 date "1999-07-23" @default.
• W2073917880 modified "2023-10-04" @default.
• W2073917880 title "Carboxylic Acid Analogues of Tamoxifen: (<i>Z</i>)-2-[<i>p</i>-(1,2-Diphenyl-1-butenyl)phenoxy]-<i>N,N</i>-dimethylethylamine. Estrogen Receptor Affinity and Estrogen Antagonist Effects in MCF-7 Cells" @default.
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• W2073917880 doi "https://doi.org/10.1021/jm990078u" @default.
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