[CH3:1][NH:2][C:3]1[C:12]([NH2:13])=[C:11]2[C:6]([CH:7]=[CH:8][CH:9]=[N:10]2)=[CH:5][CH:4]=1.[OH:14][CH2:15][C:16](O)=O.C(=O)(O)[O-].[Na+]>>[CH3:1][N:2]1[C:3]2[CH:4]=[CH:5][C:6]3[CH:7]=[CH:8][CH:9]=[N:10][C:11]=3[C:12]=2[N:13]=[C:16]1[CH2:15][OH:14]A mixture of N7-methylquinoline-7,8-diamine (1.0 g, 5.8 mmol) and 2-hydroxy acetic acid (2.2 g, 29 mmol) was stirred at 115° C. for 2 h. Then saturated sodium bicarbonate solution was added. The mixture was extracted with EtOAc. The organic layer was concentrated to give a residue which was purified by silica gel column chromatography (eluting with DCM/MeOH v/v 30:1) to give (3-methyl-3H-imidazo-[4,5-h]quinolin-2-yl)methanol as a yellow solid (1.0 g, yield 83%). ESI MS: m/z 214 [M+H]+.
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