3β-(Benzoyloxy)-2β-vinyltropane 、
3β-(t-Butyldimethylsilyloxy)-2β-[(E)-2-chlorovinyl]tropane 以gave 39 mg (22% yield) of compound 2b (column chromatography, hexane: ethyl acetate=2:1)的产率得到Benzoic acid (1R,2R,3S,5S)-2-((E)-2-chloro-vinyl)-8-methyl-8-aza-bicyclo[3.2.1]oct-3-yl ester