benzyl 1-(18β-glycyrrhet-30-yl)-2,3,4-tri-O-benzyl-β-D-glucopyranuronate 在
palladium on activated charcoal
氢气 作用下,
以
乙酸乙酯 为溶剂,
以97%的产率得到(2S,3S,4S,5R,6S)-6-[(2R,4aS,6aS,6bR,10S,12aS,14bS)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-3,4,5,6,6a,7,8,8a,10,11,12,14b-dodecahydro-1H-picene-2-carbonyl]oxy-3,4,5-trihydroxyoxane-2-carboxylic acid