tri-tert-butyl ester 10-benzyloxymethyl-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid   、                                                                                      
ethyl (4-nitrobenzyl)phosphinate                                                                                                                                                                                              以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以85%的产率得到tri-tert-butyl ester 10-[ethoxy-(4-nitrobenzyl)phosphinoylmethyl]-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid