(1R,2R,3S,4S)-3-((S)-Pyridine-2-sulfinyl)-7-oxa-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,5S)-2-isopropyl-5-methyl-cyclohexyl ester                                                                                                                                                              在
                                                                                                                                                                                 titanium(III) chloride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以93%的产率得到(1R,2R,3S,4S)-3-(Pyridin-2-ylsulfanyl)-7-oxa-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,5S)-2-isopropyl-5-methyl-cyclohexyl ester