Acetic acid 2-oxo-2-((2S,4S)-2,4,5,7,12-pentahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydro-naphthacen-2-yl)-ethyl ester   、                                                                                      Acetic acid (2S,3R,4S)-6-acetoxy-2,4-dimethyl-4-(2,2,2-trifluoro-acetylamino)-tetrahydro-pyran-3-yl ester                                                                                                                                                              在
                                                                                                                                         4 A molecular sieve                                                                                                                                                                                                                               
三氟甲磺酸三甲基硅酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环   、                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 0.25h,
                                                                                                                以31%的产率得到Acetic acid 2-{(2S,4S)-4-[(2R,4S,5R,6S)-5-acetoxy-4,6-dimethyl-4-(2,2,2-trifluoro-acetylamino)-tetrahydro-pyran-2-yloxy]-2,5,7,12-tetrahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydro-naphthacen-2-yl}-2-oxo-ethyl ester