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