乙酸酐 、
乐园树酮 以
吡啶 为溶剂,
生成 (S)-2-Hydroxy-2-methyl-butyric acid (2R,3R,3aS,4R,6aR,7aS,11S,11aS,11bR,11cS)-11-acetoxy-11c-acetoxymethyl-2-hydroxy-3,8,11a-trimethyl-1,5,10-trioxo-1,2,3,3a,4,5,6a,7,7a,10,11,11a,11b,11c-tetradecahydro-6-oxa-benzo[de]anthracen-4-yl ester 、 (S)-2-Hydroxy-2-methyl-butyric acid (2R,3R,3aS,4R,6aR,7aS,11S,11aS,11bR,11cS)-2,11-diacetoxy-11c-acetoxymethyl-3,8,11a-trimethyl-1,5,10-trioxo-1,2,3,3a,4,5,6a,7,7a,10,11,11a,11b,11c-tetradecahydro-6-oxa-benzo[de]anthracen-4-yl ester