乙酸酐 、
24-O-methylazukisapogenol methyl ester 在
吡啶 作用下,
反应 10.0h,
以52 mg的产率得到(2R,4aS,6aS,6bR,8aR,9S,10S,12aR,12bR,14bR)-10-Acetoxy-9-methoxymethyl-2,4a,6a,6b,9,12a-hexamethyl-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydro-picene-2-carboxylic acid methyl ester