[NH2:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]([CH3:15])[C:7](=[O:14])[N:8]2[CH2:11][CH2:12][OH:13])=[C:4](Cl)[N:3]=1.O.[NH2:18][NH2:19]>C(O)C>[NH2:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]([CH3:15])[C:7](=[O:14])[N:8]2[CH2:11][CH2:12][OH:13])=[C:4]([NH:18][NH2:19])[N:3]=1A mixture of 2-amino-6-chloro-9-(2-hydroxyethyl)-7-methyl-purin-8-one obtained in step 3 (8 g, 32.9 mmol), Hydrazine hydrate (16 ml, 32.9 mmol) and ethanol (300 ml) were heated at 100-110° C. for 16 hours. The reaction mixture was concentrated and solid obtained was filtered off and dried to obtain 2-amino-6-hydrazino-9-(2-hydroxyethyl)-7-methyl-purin-8-one (7 g, 89%) as an off white solid.
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