methyl (28-Hydroxy-23,28-dioxoolean-12-en-3β-yl β-D-Glucopyranoside)uronate 、
原甲酸三甲酯 在
三氯化铁 作用下,
以
甲醇 为溶剂,
反应 47.0h,
以206 mg的产率得到(2S,3S,4S,5R,6R)-6-((3S,4S,4aR,6aR,6bS,8aS,14bR)-8a-Carboxy-4-dimethoxymethyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydro-picen-3-yloxy)-3,4,5-trihydroxy-tetrahydro-pyran-2-carboxylic acid methyl ester