Berberine Analogues as a novel class of the low-density-lipoprotein receptor up-regulators: synthesis, structure− activity relationships, and cholesterol-lowering …
Twenty-nine derivatives of berberine (1) or pseudoberberine (2) were designed, semisynthesized, and evaluated for their up-regulatory activity on the low-density-lipoprotein receptor (LDLR) expression. SAR analysis revealed that (i) the methylenedioxy group at the 2-and 3-position is an essential element to keep the activity,(ii) the 7-position quaternary ammonium and planar structure of the compound are activity-required, and (iii) addition of ...