Efficient synthesis of mugineic acid, a typical phytosiderophore, utilizing the phenyl group as the carboxyl synthon
摘要:
Stereoselective total synthesis of mugineic acid, a unique phytosiderophore from roots of barley, has been achieved from (2R,3R)- and (2S,3S)-2,3-epoxycinnamyl alcohols employing the phenyl group as the carboxyl synthon.
We report that transition metal-catalyzed nucleophilic activation can be combined with chiral amine-catalyzed iminium activation as exemplified by the unprecedented enantioselectiveconjugateaddition of a dimethylsilanyl group to α,β-unsaturatedaldehydes. These reactions proceed with excellent 1,4-selectivity to afford the corresponding β-silyl aldehyde products 3 in high yields and up to 97:3 er
Stereoselective total synthesis of mugineic acid (1), a unique phytosiderophore from roots of barley, has been achieved from madily available (2S,3S)- and (2R,3R)-2,3-epoxycinnamyl alcohols (5) and (6). The key step is the oxidation of the phenyl group to the carboxylic acid by use of the ruthenium trichloride-sodium metaperiodate system.