Design, Synthesis, and In Vitro Testing of α-Methylacyl-CoA Racemase Inhibitors
摘要:
The enzyme alpha-methylacyl-CoA racemase (AMACR) is overexpressed in prostate, colon, and other cancers and has been partially validated as a potential therapeutic target by siRNA knockdown of the AMACR gene. Analogs of the natural substrate branched chain alpha-methylacyl coenzyme A esters, possessing one or more beta-fluorine atoms, have been synthesized using Wittig, conjugate addition, and asymmetric aldol reactions and found to be reversible competitive inhibitors. Each diastereomer of the previously reported inhibitor ibuprofenoyl-CoA was also tested. The compounds had K-i values of 0.9-20 mu M and are the most potent inhibitors yet known. The presence of beta-fluorine on the alpha-methyl group or the acyl chain results in a significant lowering of the K-i value compared with nonfluorinated analogs, and this is attributed to a lowering of the pK(a) of the alpha-proton, facilitating enolization and binding. Several of the CoA ester inhibitors were formed by incubating the free carboxylic acid precursors with cell free extracts and CoA. alpha-Trifluoromethyltetradecanoic acid, the precursor to the most potent inhibitor, was shown to inhibit growth of cancer cell lines PC3, CWR22 Rv1, and Du145 in a dose-dependent manner and could be related to the expression level of AMACR.
The first general method for α-trifluoromethylation of carboxylic acids using BrF<sub>3</sub>
作者:Aviv Hagooly、Shlomo Rozen
DOI:10.1039/b315705a
日期:——
2-Carbomethoxy-1,1-bis(methylsulfide)-1-alkenes, easily made from carboxylic acids, CS2 and MeI, were treated with BrF3 producing eventually the desired α-trifluoromethyl carboxylate derivatives â RCH(CF3)COORâ²
â in good yields.
2-Carbomethoxy-1,1-bis(methylsulfide)-1-alkenes 很容易由羧酸、CS2 和 MeI 制成,用 BrF3 处理后,最终会以良好的收率生成所需的δ-三氟甲基羧酸衍生物 RCH(CF3)COORâ² 。