tert-butyl (S)-2-(tert-butoxycarbonylamino)-5-[1-(2,4-dimethoxybenzyl)-1H-imidazo[4,5-b]pyridin-2-ylamino]pentanoate   、                                                                                      
(S)-(-)-tert-butyl-2-<(tert-butoxycarbonyl)amino>-6-iodohexanoate                                                                                                                                                                                              以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 72.0h,
                                                                                                                以69%的产率得到tert-butyl (2S)-6-[1-[(2,4-dimethoxyphenyl)methyl]-2-[[(4S)-5-[(2-methylpropan-2-yl)oxy]-4-[(2-methylpropan-2-yl)oxycarbonylamino]-5-oxopentyl]amino]imidazo[4,5-b]pyridin-4-ium-4-yl]-2-[(2-methylpropan-2-yl)oxycarbonylamino]hexanoate;iodide