methyl (2S,3S,3a'S,5'R)-8'-hydroxy-4-(hydroxymethyl)-3-methyl-5'-pentyl-3',3a',4,5,5',6'-hexahydro-3H-spiro[furan-2,2'-pyrano[2,3,4-de]chromene]-9'-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
咪唑   、                                                                                                  
碘   、                                                                                                  
三苯基膦                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚   、                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以52%的产率得到methyl (2S,3S,3a'S,4S,5'R)-8'-hydroxy-4-(iodomethyl)-3-methyl-5'-pentyl-3',3a',4,5,5',6'-hexahydro-3H-spiro[furan-2,2'-pyrano[2,3,4-de]chromene]-9'-carboxylate