(S)-tert-butyl 3-((4-(3-iodobenzylamino)-5-aminopyrimidin-2-ylamino)methyl)pyrrolidine-1-carboxylate   、                                                                                      
N,N'-羰基二咪唑                                                                                                                                                              在
                                                                                                                                                                                 
水   、                                                                                                  
(S)-tert-butyl 3-((9-(3-iodobenzyl)-8-oxo-8,9-dihydro-7H-purin-2-ylamino)methyl)pyrrolidine-1-carboxylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以to give (S)-tert-Butyl 3-((9-(3-iodobenzyl)-8-oxo-8,9-dihydro-7H-purin-2-ylamino)methyl)pyrrolidine-1-carboxylate (0.15 g, 38%; Intermediate 25) as a pale purple solid的产率得到(S)-tert-butyl 3-((9-(3-iodobenzyl)-8-oxo-8,9-dihydro-7H-purin-2-ylamino)methyl)pyrrolidine-1-carboxylate