重氮甲烷   、                                                                                      
<1S-(1α,2β(Z),3α,4α)>-7-<3-<<2-<(phenylamino)carbonyl>hydrazino>methyl>-5-oxabicyclo<2.2.1>hept-2-yl>-5-heptenoic acid                                                                                                                                                                                              以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                                                        以52%的产率得到methyl <1S-(1α,2β(Z),3α,4α)>-7-<3-<<2-<(phenylamino)carbonyl>hydrazino>methyl>-5-oxabicyclo<2.2.1>hept-2-yl>-5-heptenoate