Concise Syntheses of the Abyssinones and Discovery of New Inhibitors of Prostate Cancer and MMP-2 Expression
摘要:
The first asymmetric syntheses of four members of the abyssinone class of natural products (I, II, III, and IV 4'-OMe) via quinine- or quinidine-derived thiourea-catalyzed intramolecular conjugate additions of beta-keto ester alkylidenes are reported. This concise strategy delivers all four natural products and their corresponding antipodes. A preliminary evaluation of all of these small molecules against a metastatic human prostate cancer cell line has identified that these compounds selectively and differentially inhibit cell growth and downregulate the expression of matrix metalloproteinase-2 (MMP-2) at nontoxic concentrations.
TcCGT1, which is initiated by the spontaneous deprotonation of the substrate. The spacious binding pocket explains the substrate promiscuity, and the binding pose of the substrate determines C‐ or O‐glycosylation activity. Site‐directed mutagenesis at two residues (I94E and G284K) switched C‐ to O‐glycosylation. TcCGT1 is the first plant CGT with a crystal structure and the first flavone 8‐C‐glycosyltransferase
Concise Syntheses of the Abyssinones and Discovery of New Inhibitors of Prostate Cancer and MMP-2 Expression
作者:Rebecca L. Farmer、Margaret M. Biddle、Antoinette E. Nibbs、Xiaoke Huang、Raymond C. Bergan、Karl A. Scheidt
DOI:10.1021/ml100110x
日期:2010.11.11
The first asymmetric syntheses of four members of the abyssinone class of natural products (I, II, III, and IV 4'-OMe) via quinine- or quinidine-derived thiourea-catalyzed intramolecular conjugate additions of beta-keto ester alkylidenes are reported. This concise strategy delivers all four natural products and their corresponding antipodes. A preliminary evaluation of all of these small molecules against a metastatic human prostate cancer cell line has identified that these compounds selectively and differentially inhibit cell growth and downregulate the expression of matrix metalloproteinase-2 (MMP-2) at nontoxic concentrations.