Total synthesis of three naturally occurring 6,8-di-C-glycosylflavonoids: phloretin, naringenin, and apigenin bis-C-β-d-glucosides
作者:Shingo Sato、Toshiki Akiya、Hiroaki Nishizawa、Toshiyuki Suzuki
DOI:10.1016/j.carres.2006.02.019
日期:2006.6
Three naturally occurring di-C-glycosylflavonoids, phloretin (dihydrochalcone), naringenin (flavanone), and apigenin (flavone) bis-6,8-C-beta-D-glucopyranosides (4, 5, and 6), were synthesized in total yields of 52.3%, 53.5%, and 36.4%, respectively, starting from the key compound, di-C-beta-D-glucopyranosylphloroacetophenone (1). Benzyl protection of the phenolic hydroxyls in I and a subsequent aldol condensation with benzyloxybenzaldehyde led to the production of chalcone 3, which, after hydrogenolysis or acid hydrolysis and deprotection, gave 4 and 5, respectively. The acetylation of 5, followed by DDQ oxidation and deprotection, gave 6. (c) 2006 Elsevier Ltd. All rights reserved.