Synthesis of a non-hydrolyzable estrone sulfate analogue bearing the difluoromethanesulfonamide group and its evaluation as a steroid sulfatase inhibitor
作者:Yong Liu、Vanessa Ahmed、Bryan Hill、Scott D. Taylor
DOI:10.1039/b508852f
日期:——
Steroid sulfatase (STS) catalyzes the hydrolyis of steroidal sulfates such as estrone sulfate (ES1) and is considered to be an attractive target in the treatment of steroid dependent cancers. A non-hydrolyzable estrone sulfate (ES1) analogue bearing an α,α-difluorosulfonamide moiety at the 3-position on the A-ring, compound 7, was synthesized. Key to the success of this synthesis was the first use of the allyl group as a sulfonamide protecting group. The pKa of this ES1 mimic in 0.1 M bis-tris propane, 10% DMSO was determined to be 8.05 using 19F NMR. Compound 7 is a reversible inhibitor with a Ki similar to that of its sulfonate analogue at pH 7.0. It is more potent than its nonfluorinated sulfonamide analogue and, its inhibitory potency increases with increasing pH, a trend opposite to that of other STS inhibitors. Possible reasons for this are presented.
类固醇硫酸酯酶 (STS) 催化类固醇硫酸盐的水解,例如硫酸雌酮 (ES1),被认为是治疗类固醇依赖性癌症的一个有吸引力的靶标。合成了在 A 环 3 位上带有 α,α-二氟磺酰胺部分的不可水解雌酮硫酸盐 (ES1) 类似物,即化合物 7。该合成成功的关键是首次使用烯丙基作为磺酰胺保护基团。使用 19F NMR 测定此 ES1 模拟物在 0.1 M 双-三丙烷、10% DMSO 中的 pKa 为 8.05。化合物 7 是一种可逆抑制剂,在 pH 7.0 时的 Ki 值与其磺酸盐类似物相似。它比非氟化磺酰胺类似物更有效,并且其抑制效力随着 pH 值的增加而增加,这一趋势与其他 STS 抑制剂相反。提出了可能的原因。