(1S,2S,3R,4R)-3-((R)-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(1S,2S,3R,4R)-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