F[C:2](F)(F)C(O)=O.[NH2:8][C:9]1[C:10]([NH:20][CH2:21][C:22]2[CH:27]=[CH:26][C:25]([OH:28])=[CH:24][CH:23]=2)=[N:11][C:12]([C:15]2[S:16][CH:17]=[CH:18][CH:19]=2)=[CH:13][N:14]=1>C(OCC)(OCC)OCC>[S:16]1[CH:17]=[CH:18][CH:19]=[C:15]1[C:12]1[N:11]=[C:10]2[N:20]([CH2:21][C:22]3[CH:27]=[CH:26][C:25]([OH:28])=[CH:24][CH:23]=3)[CH:2]=[N:8][C:9]2=[N:14][CH:13]=1A solution of 4-[(3-amino-6-thiophen-2-yl-pyrazin-2-ylamino)-methyl]-phenol trifluoroacetic acid salt (10 mg, 0.024 mmol) in triethyl orthoformate (1.5 mL) was refluxed for 4 hours. The starting material was disappeared completely. After evaporation of triethyl orthoformate, the crude product was crystallized in hexane-dichloromethane system to provide 4-(6-thiophen-2-yl-imidazo[4,5-b]pyrazin-1-ylmethyl)-phenol as a brown solid (5 mg).
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