dimethyl (RS)-2-(<(1S,2R,4R)-2-hydroxy-7,7-dimethylbicyclo<2.2.1>heptan-1-yl>methylsulphinyl)maleate 、
环戊二烯 在
zinc(II) chloride 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以86%的产率得到dimethyl (1R,2R,3S,4S)-2-((R)-(((1S,2R,4R)-2-hydroxy-7,7-dimethylbicyclo[2.2.1]heptan-1-yl)methyl)sulfinyl)bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate