(cis)-4-[4-(cyclopropylmethyl)piperazin-1-yl]cyclohexanamine   、                                                                                         、                                                                                      
7-[[(7S)-8-isopropyl-7-ethyl-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   、                                                                                      
氨                                                                                                                                                              在
                                                                                                                                                                                 
二氯甲烷   、                                                                                                  Brine   、                                                                                                  
magnesium sulfate   、                                                                                                  silica gel   、                                                                                                  
N-[(cis)-4-[4-(cyclopropylmethyl)piperazin-1-yl]cyclohexyl]-7-[[(7S)-7-ethyl-8-isopropyl-5-methyl-6 -oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxamide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以A to obtain the title compound N-[(cis)-4-[4-(cyclopropylmethyl)piperazin-1-yl]cyclohexyl]-7-[[(7S)-7-ethyl-8-isopropyl-5-methyl-6-oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxamide 43 (1.12 g, yield: 74.6%) as a white solid的产率得到N-[(cis)-4-[4-(cyclopropylmethyl)piperazin-1-yl]cyclohexyl]-7-[[(7S)-7-ethyl-8-isopropyl-5-methyl-6 -oxo-7H-pteridin-2-yl]amino]-2,3-dihydrobenzofuran-4-carboxamide