[Cl:1][C:2]1[CH:9]=[C:8]([Cl:10])[CH:7]=[CH:6][C:3]=1[CH2:4][NH2:5].[Cl:11][C:12]1[N:13]=[C:14](Cl)[C:15]2[CH:21]=[CH:20][CH:19]=[N:18][C:16]=2[N:17]=1.C(N(CC)C(C)C)(C)C>ClCCCl.O>[Cl:11][C:12]1[N:13]=[C:14]([NH:5][CH2:4][C:3]2[CH:6]=[CH:7][C:8]([Cl:10])=[CH:9][C:2]=2[Cl:1])[C:15]2[CH:21]=[CH:20][CH:19]=[N:18][C:16]=2[N:17]=12,4-Dichlorobenzylamine (211 mg, 1.2 mmol) was added to the stirred solution of 2,4 dichloro-pyrido[2,3-d]pyrimidine(200 mg, 1 mmol) and N,N-diisopropylethylamine (266 μL, 1.5 mmol) in 1,2-dichloroethane (5 mL). The reaction mixture was stirred at room temperature for 12 h and then diluted with water (10 mL). The aqueous layer was extracted with CH2Cl2 and the combined organic layer was washed with water (2×10 mL), dried (Na2SO4) and concentrated in vaccuo to give (2-Chloro-pyrido[2,3-d]pyrimidin-4-yl)-(2,4-dichloro-benzyl)-amine as a yellow oil (185 mg) and was used as such in the next reaction without further purification.
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