(1S,2R,6R,9R,10S,11R,12R)-7-[(2-bromo-1-ethoxyethoxy)methyl]-12-(methoxymethoxymethyl)-4,4-dimethyl-11-(phenylmethoxymethyl)-3,5-dioxatetracyclo[7.3.1.02,6.06,10]tridec-7-en-9-ol                                                                                                                                                              在
                                                                                                                                                                                 
偶氮二异丁腈   、                                                                                                  
三正丁基氢锡                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (1S,2R,6R,7R,9R,10S,11R,12R)-2'-ethoxy-12-(methoxymethoxymethyl)-4,4-dimethyl-11-(phenylmethoxymethyl)spiro[3,5-dioxatetracyclo[7.3.1.02,6.06,10]tridecane-7,4'-oxolane]-9-ol