6-O-Malonyl-β-methyl-d-glucopyranoside from roots of Rumex obtusifolius
作者:Takanori Kasai、Michiko Okuda、Sadao Sakamura
DOI:10.1016/0031-9422(81)83043-9
日期:1981.1
Abstract From the methanol-soluble acidic fraction of Rumexobtusifolius 6-O-malonyl-β-methyl- d -glucopyranoside and ascorbalamic acid were isolated and identified. The identity of The former compound was confirmed by synthesis.
directly introduce these acyl moieties by an enzyme-catalyzed reaction of 2a with the corresponding activated esters. This new approach was based on the regioselective introduction of a methyl malonate residue at the CH2OH of the sugar moiety by catalysis with the protease subtilisin ( 22a). The mixed diester 22a was then subjected to chemoselective hydrolysis of the methoxycarbonyl function by another