(S)-2-((2R,4aS)-8-Bromomethyl-4a-methyl-7-oxo-1,2,3,4,4a,7-hexahydro-naphthalen-2-yl)-propionic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
sodium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以2%的产率得到(1S,9R,11S,19R)-1,8,11,18-Tetramethyl-5,9,10,11,15,18,19,20-octahydro-4H,7H-1,19:9,11-diethanodibenzo(c,k)(1,9)dioxacyclohexadecine-4,7,14,17(1H,8H)-tetrone