4,10-bis-[((S)-1-phenyl-ethylcarbamoyl)-methyl]-1,4,7,10-tetraaza-cyclododecane-1-carboxylic acid tert-butyl ester   、                                                                                      2-bromomethyl-7-methoxycarbonyl-azaxanthone                                                                                                                                                              在
                                                                                                                                                                                 
potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以77%的产率得到2-(7-tert-butoxycarbonyl-4,10-bis-[((S)-1-phenyl-ethylcarbamoyl)-methyl]-1,4,7,10-tetraaza-cyclododec-1-ylmethyl)-10-oxo-10H-9-oxa-1-aza-anthracene-6-carboxylic acid methyl ester