2,6-Difluoro-7-(3-hydroxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-3-methyl-nona-2,4,6-trienoic acid ethyl ester   、                                                                                      
(2Z,4E,6E)-2,6-difluoro-7-(3-hydroxy-5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-3-methyl-nona-2,4,6-trienoic acid ethyl ester   、                                                                                      
potassium carbonate   、                                                                                      
1-碘代丙烷                                                                                                                                                              在
                                                                                                                                                                                 
ethyl acetate n-hexane                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                                                        以the title compound was obtained as a clear syrup (80 mg, 41%)的产率得到(2Z,4E,6E)-2,6-difluoro-3-methyl-7-(5,5,8,8-tetramethyl-3-propoxy-5,6,7,8-tetrahydro-naphthalen-2-yl)-nona-2,4,6-trienoic acid ethyl ester