tert-butyl (1S,3R,5S,6S,7S)-3-(tert-butyl)-7-chloro-6-hydroxy-7-{2-[(tert-butyldiphenylsilyl)oxy]ethyl}-2-oxa-4-azabicyclo[3.2.0]heptane-4-carboxylate   、                                                                                      
3-溴丙烯                                                                                                                                                              在
                                                                                                                                                                                 potassium hydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃   、                                                                                         mineral oil                                                                                  为溶剂,
                                                                                                                                                                                        以90%的产率得到tert-butyl (1S,3R,5S,6S,7S)-3-(tert-butyl)-7-chloro-6-allyloxy-7-{2-[(tert-butyldiphenylsilyl)oxy]ethyl}-2-oxa-4-azabicyclo[3.2.0]heptane-4-carboxylate