tert-butyl 4-[(2S)-3-[[7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carbonyl]amino]-2-hydroxy-propyl]piperazine-1-carboxylate   、                                                                                         、                                                                                      
盐酸   、                                                                                      
碳酸氢钠   、                                                                                      
对甲苯磺酸甲酯                                                                                                                                                              在
                                                                                                                                                                                 
乙腈   、                                                                                                  
二氯甲烷   、                                                                                                  
氯化钠   、                                                                                                  
magnesium sulfate   、                                                                                                  silica gel   、                                                                                                  
7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-hydroxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷   、                                                                                         
1,4-二氧六环   、                                                                                         
水                                                                                  为溶剂,
                                                                                                                                                    反应 12.5h,
                                                                                                                以to obtain the title compound 7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-hydroxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide 8 (150 mg, yield: 30.0%) as a white solid的产率得到7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(2S)-2-hydroxy-3-(4-methylpiperazin-1-yl)propyl]-2,3-dihydrobenzofuran-4-carboxamide