Cl[C:2]1[N:10]=[C:9]2[C:5]([N:6]=[CH:7][N:8]2C(C)C)=[C:4](NCC2C=CC(OC)=CC=2)[N:3]=1.CO[C:26]1[CH:43]=CC(CNC2N=C(Cl)N=C3C=2NC=N3)=C[CH:27]=1.[H-].[Na+].IC(C)C>CN(C=O)C.O>[CH:26]([C:2]1[N:10]=[C:9]2[C:5]([NH:6][CH:7]=[N:8]2)=[CH:4][N:3]=1)([CH3:43])[CH3:27]Preparation of 2-chloro-6-(4-methoxybenzylamino)-9-isopropylpurine (2) The 6-(4-methoxybenzylamino)-2-chloropurine (496 mg, 1.7 mmol) was suspended in dry DMF (5 ml) and treated with sodium hydride, 60% dispersion (82 mg, 2.06 mmol). The suspension was stirred for 30 min over which time it became a clear yellow/green solution. 2-Iodopropane (0.280 mL, 1.7 eq.) was added over 5 min and the resultant solution stirred for 2 days. Water was added and the solution and extracted with ethyl acetate. The organic layer was evaporated to give the product isopropyl purine (508 mg, 89%).
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