7-[[(7R)-7-ethyl-8-isopropyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxylic acid   、                                                                                      
2-(1H-Benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate   、                                                                                      
N,N-二异丙基乙胺   、                                                                                      
(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propan-1-amine   、                                                                                      
disodium;carbonate                                                                                                                                                              在
                                                                                                                                                                                 
二氯甲烷   、                                                                                                  
氯化钠   、                                                                                                  
Sodium sulfate-III   、                                                                                                  silica gel   、                                                                                                  
7-[[(7R)-7-ethyl-8-isopropyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以to obtain the title compound 7-[[(7R)-7-ethyl-8-isopropyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide 39 (35 mg, yield: 26.5%) as a white solid的产率得到7-[[(7R)-7-ethyl-8-isopropyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-methoxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide