1-O-acetyl trioxacarcinose A   、                                                                                      (2R,2‘R,3a'R,13a’R)-12’-hydroxy-2’-(hydroxymethyl)-7’,13a’-dimethoxy-5’-methyl-3a’,4’,8’,9’,10’,13a’-hexahydro-2‘H,11‘H-spiro[oxirane-2,1’-[2,4]epoxyfuro[3,2-b]naphtho[2,3-h]chromen]-11’-one                                                                                                                                                              在
                                                                                                                                                                                 
三氟化硼乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以82 %的产率得到(2S,3S,4R,6S)-4-hydroxy-6-(((2R,13a'R)-12’-hydroxy-7’,13a’-dimethoxy-5’-methyl-11‘-oxo-3a’,8’,9’,10’,11',13a’-hexahydro-2’H,4’H-spiro[oxirane-2,1‘-[2,4]epoxyfuro[3,2-b]naphtho[2,3-h]chromen]-2’-yl)methoxy)-2,4-dimethyltetrahydro-2H-pyran-3 -yl acetate