(1R,2R,3R)-1-(3,4-Dimethoxy-phenyl)-2,3-bis-hydroxymethyl-6,7-dimethoxy-1,2,3,4-tetrahydro-naphthalen-2-ol                                                                                                                                                              在
                                                                                                                                         
对甲苯磺酸                                                                                                                                                                                                                               吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 15.0h,
                                                                                                                生成                                                 
[(2'S,4S,4'S)-4'-(3,4-dimethoxyphenyl)-6',7'-dimethoxy-2,2-dimethylspiro[1,3-dioxolane-4,3'-2,4-dihydro-1H-naphthalene]-2'-yl]methyl acetate