(5R,10R)-10-(1-Hydroxy-allyl)-3,4-dimethoxy-1-oxa-spiro[4.5]deca-3,7-dien-2-one   、                                                                                      
4-<1α-methyl-1β-(carbomethoxy)-5β-(methoxymethoxy)-1,2,4aα,5,6,7,8,8aβ-octahydronaphthyl>butyric acid                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶   、                                                                                                  
N,N'-二环己基碳二亚胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以89%的产率得到(1R,2R,4aS,5R,8aR)-2-{3-[1-((5S,6S)-3,4-Dimethoxy-2-oxo-1-oxa-spiro[4.5]deca-3,8-dien-6-yl)-allyloxycarbonyl]-propyl}-5-methoxymethoxy-1-methyl-1,2,4a,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester