(+/-)-2-(benzyloxycarbonyl)-6-ethyl-7-exo-chloro-2-azabicyclo<2.2.2>oct-5-ene-7-endo-carboxylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
氢溴酸                                                                                                                                  作用下,
                                                                                                                                                                                        反应 0.5h,
                                                                                                                以99.56%的产率得到(+/-)-6-ethyl-7-exo-chloro-2-azabicyclo<2.2.2>oct-5-ene-7-endo-carboxylic acid methyl ester hydrogen bromide salt