7-[[(7R)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxylic acid   、                                                                                      
trans-4-[4-(Cyclopropylmethyl)-1-piperazinyl]cyclohexanamine   、                                                                                      
2-(1H-Benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate   、                                                                                      
N,N-二异丙基乙胺   、                                                                                      
碳酸氢钠                                                                                                                                                              在
                                                                                                                                                                                 
二氯甲烷   、                                                                                                  
水   、                                                                                                  
氯化钠   、                                                                                                  
magnesium sulfate   、                                                                                                  silica gel   、                                                                                                  
7-[[(7R)-8-cyclopentyl-7-ethyl-5 -methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(trans)-4-[4-(cyclopropylmethyl)piperazin-1 -yl]cyclohexyl]-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)-8-cyclopentyl-7-ethyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-N-[(trans)-4-[4-(cyclopropylmethyl)piperazin-1-yl]cyclohexyl]-2,3-dihydrobenzofuran-4-carboxamide 34 (50 mg, yield: 40.0%) 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-[(trans)-4-[4-(cyclopropylmethyl)piperazin-1 -yl]cyclohexyl]-2,3-dihydrobenzofuran-4-carboxamide