Application of the Goldilocks Effect to the Design of Potent and Selective Inhibitors of Phenylethanolamine <i>N</i>-Methyltransferase: Balancing p<i>K</i><sub>a</sub> and Steric Effects in the Optimization of 3-Methyl-1,2,3,4-tetrahydroisoquinoline Inhibitors by β-Fluorination
作者:Gary L. Grunewald、Mitchell R. Seim、Jian Lu、Mariam Makboul、Kevin R. Criscione
DOI:10.1021/jm051262k
日期:2006.5.1
inhibitors of phenylethanolamine N-methyltransferase (PNMT), but are not selective due to significant affinity for the alpha(2)-adrenoceptor. Fluorination of the methyl group lowers the pK(a) of the THIQ amine from 9.53 (CH(3)) to 7.88 (CH(2)F), 6.42 (CHF(2)), and 4.88 (CF(3)). This decrease in pK(a) results in a reduction in affinity for the alpha(2)-adrenoceptor. However, increased fluorination also results