(+/-)-cis-7-<(tert-butyldimethylsilyl)oxy>-9-hydroxy-6,11-dimethoxy-9-<1-oxo-2-<(tert-butyldimethylsilyl)oxy>ethyl>-7,8,9,10-tetrahydonaphthacene-5,12-dione                                                                                                                                                              在
                                                                                                                                                                                 
氢氟酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以98%的产率得到(+/-)-cis-7,9-dihydroxy-6,11-dimethoxy-9-(1-oxo-2-hydroxyethyl)-7,8,9,10-tetrahydonaphthacene-5,12-dione