[Cl:1][C:2]1[N:3]=[C:4](Cl)[C:5]2[CH:10]=[CH:9][NH:8][C:6]=2[N:7]=1.[NH:12]1[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]1.C(N(CC)CC)C.O>O1CCOCC1.CCOC(C)=O>[Cl:1][C:2]1[N:3]=[C:4]([N:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)[C:5]2[CH:10]=[CH:9][NH:8][C:6]=2[N:7]=1A mixture of 2,4-dichloro-7H-pyrrolo[2,3-d]pyrimidine (100 mg, 0.531 mmol), piperidine (0.060 mL, 0.607 mmol) and triethylamine (0.200 mL, 1.43 mmol) in dioxane (4 mL) was stirred at 70° C. for 20 h. Water and EtOAc were added. The organic phase was separated, dried over Na2SO4, concentrated in vacuo to give 2-chloro-4-(piperidin-1-yl)-7H-pyrrolo[2,3-d]pyrimidine (123 mg). MS 237.3 and 239.3 (M+H, Cl pattern)
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