7-methoxycarbonyl-2-chloromethylcarbonylaminomethyl-1-azaxanthone   、                                                                                      
(SS)-1,7-bis(diethyl-N-acetyl-S-glutamate)-4-carboxylic acid tert-butyl ester-1,4,7,10-tetraazacyclododecane                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以71%的产率得到tert-butyl 4,10-bis({[(2S)-1-ethoxy-1-oxopropan-2-yl]carbamoyl}methyl)-7-[(([7-(methoxycarbonyl)-5-oxo-5H-chromeno[2,3-b]pyridin-2-yl]methyl)carbamoyl)methyl]-1,4,7,10-tetraazacyclododecane-1-carboxylate