[H-].[Na+].C[N:4]([CH:6]=O)C.[SH:8]CC(NC)=O.[NH2:14][C:15]1[N:23]=[C:22](Cl)[N:21]=[C:20]2[C:16]=1[N:17]=[CH:18][N:19]2[CH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.CCCC[CH2:36][CH3:37]>[Cl-].[Na+].O>[CH3:6][NH:4][C:36](=[S:8])[CH2:37][C:22]1[N:21]=[C:20]2[C:16]([N:17]=[CH:18][N:19]2[CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)=[C:15]([NH2:14])[N:23]=1Sodium hydride (320 mg, 8 mmol 60% in mineral oil) was washed with hexane. Thereto were added DMF (10 ml), 2-mercapto-N-methylacetamide (1 ml) and 6-amino-9-benzyl-2-chloropurine (200 mg, 0.77 mmol) in order. The mixture was stirred at 100° C. for 8 hours. After addition of saturated brine the reaction mixture was extracted with ethyl acetate. The organic layer was dried on magnesium sulfate and the solvent was removed in vacuo. The residue was purified with silica gel chromatography (3% methanol/chloroform) to give the subject compound (158 mg, yield 60%).
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