Abstract
An improved steroid sulfatase inhibitor was prepared by replacing the N-propyl group of the second-generation steroid-like inhibitor (2) with a N-3,3,3-trifluoropropyl group to give (10). This compound is 5-fold more potent in vitro, completely inhibits rat liver steroid sulfatase activity after a single oral dose of 0.5 mg/kg, and exhibits a significantly longer duration of inhibition over (2). These biological properties are attributed to the increased lipophilicity and metabolic stability of (10) rendered by its trifluoropropyl group and also the potential H-bonding between its fluorine atom(s) and Arg(98) in the active site of human steroid sulfatase. Like other sulfamates, (10) is expected to be sequestered, and transported by, erythrocytes in vivo because it inhibits human carbonic anhydrase II (hCAII) potently (IC(50), 3 nmol/L). A congener (4), which possesses a N-(pyridin-3-ylmethyl) substituent, is even more active (IC(50), 0.1 nmol/L). To rationalize this, the hCAII-(4) adduct, obtained by cocrystallization, reveals not only the sulfamate group and the backbone of (4) interacting with the catalytic site and the associated hydrophobic pocket, respectively, but also the potential H-bonding between the N-(pyridin-3-ylme...Continue Reading
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