苯氧乙酰氯   、                                                                                      
(S)-2-{[1-(4-Methoxy-phenyl)-meth-(Z)-ylidene]-amino}-3-methyl-butyric acid ethyl ester                                                                                                                                                              在
                                                                                                                                                                                 
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 (S)-2-[(2R,3S)-2-(4-Methoxy-phenyl)-4-oxo-3-phenoxy-azetidin-1-yl]-3-methyl-butyric acid ethyl ester   、                                                                                             (S)-2-[(2S,3R)-2-(4-Methoxy-phenyl)-4-oxo-3-phenoxy-azetidin-1-yl]-3-methyl-butyric acid ethyl ester