[Br:1][C:2]1[C:6]2[N:7]=[C:8]([Cl:12])[N:9]=[C:10](Cl)[C:5]=2[S:4][CH:3]=1.[CH2:13]([NH2:20])[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.O>O1CCCC1>[CH2:13]([NH:20][C:10]1[C:5]2[S:4][CH:3]=[C:2]([Br:1])[C:6]=2[N:7]=[C:8]([Cl:12])[N:9]=1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=17-Bromo-2,4-dichlorothieno[3,2-d]pyrimidine (500 mg, 1.77 mmol) was dissolved in anhydrous tetrahydrofuran (8 mL) and stirred at 60° C. for 2 hours after adding benzylamine (0.58 mL, 5.32 mmol). The reaction mixture was cooled to room temperature and added to water (30 mL). Thus prepared solid was filtered and dried with nitrogen gas. The resultant target compound (580 mg, 92% yield) was used in the following reaction without purification.
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