(S)-(+)-alpha-甲氧基苯乙酸 、
(7aS,11aS,11bR)-11-Hydroxy-2,2-dimethyl-8,11,11a,11b-tetrahydro-7aH-1,3-dioxa-benzo[de]anthracen-7-one 在
4-二甲氨基吡啶 、
pyridinium chlorochromate 作用下,
以
乙醚 为溶剂,
生成 (S)-Methoxy-phenyl-acetic acid (7aS,11R,11aS,11bR)-2,2-dimethyl-7-oxo-7,7a,8,11,11a,11b-hexahydro-1,3-dioxa-benzo[de]anthracen-11-yl ester 、 (S)-Methoxy-phenyl-acetic acid (7aR,11S,11aR,11bS)-2,2-dimethyl-7-oxo-7,7a,8,11,11a,11b-hexahydro-1,3-dioxa-benzo[de]anthracen-11-yl ester