1,4-Dihydroxy-2-((5S,6S)-8-hydroxy-2,2-dimethyl-1,3,7-trioxa-spiro[4.4]non-6-yl)-anthraquinone 在
sodium hydroxide 、 sodium dithionite 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以57%的产率得到(4S,7'R,10'R)-6',7',10',11'-tetrahydroxy-2,2-dimethylspiro[1,3-dioxolane-4,9'-8,10-dihydro-7H-tetracene]-5',12'-dione