9-diazo-4-hydroxymethyl-9H-fluorene   、                                                                                      
(2R,5S)-7-ethoxycarbonyl-8-oxo-2-phenyl-1-aza-3-oxa-bicyclo[3.3.0]oct-6-ene                                                                                                                                                                                              以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                以32%的产率得到(2R,5S,6S,7R,9S)-4′-hydroxymethylspiro[1-aza-7-ethoxycarbonyl-3-oxa-8-oxo-2-phenyltricyclo[4.3.0
1,5.0
6,7]-nonane-9,9′-fluorene]