[OH:1][C@@H:2]1[C@H:6]([OH:7])[C@@H:5]([CH2:8][OH:9])[O:4][C@H:3]1[N:10]1[CH:18]=[N:17][C:16]2[C:11]1=[N:12][C:13]([C:34](OC)=[O:35])=[N:14][C:15]=2[NH:19][CH2:20][CH:21]([C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.[NH2:38][CH2:39][CH2:40][N:41]1[CH2:46][CH2:45][O:44][CH2:43][CH2:42]1>C(OCC)C>[OH:1][C@@H:2]1[C@H:6]([OH:7])[C@@H:5]([CH2:8][OH:9])[O:4][C@H:3]1[N:10]1[CH:18]=[N:17][C:16]2[C:11]1=[N:12][C:13]([C:34]([NH:38][CH2:39][CH2:40][N:41]1[CH2:46][CH2:45][O:44][CH2:43][CH2:42]1)=[O:35])=[N:14][C:15]=2[NH:19][CH2:20][CH:21]([C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)[C:22]1[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=1A mixture of methyl 9-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)-tetrahydro-2-furanyl]-6-[(2,2-diphenylethyl)amino]-9H-purine-2-carboxylate (Preparation 18) (92 mg, 0.18 mmol) and N-(2-aminoethyl)morpholine (0.25 ml, 1.9 mmol) were heated at 120° C. under a nitrogen atmosphere for 75 minutes. The reaction mixture was allowed to cool to room temperature and diethyl ether (2 ml) added to precipitate the title compound as a white solid which was filtered off and dried (68 mg).
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