[CH3:1][O:2][C:3]1[CH:4]=[N:5][C:6]2[CH:7]=[CH:8][CH:9]=[C:10]([CH:13]=[O:14])[C:11]=2[N:12]=1.[BH4-].[Na+].C1COCC1.O>CCO>[CH3:1][O:2][C:3]1[CH:4]=[N:5][C:6]2[C:11]([N:12]=1)=[C:10]([CH2:13][OH:14])[CH:9]=[CH:8][CH:7]=2To a stirred suspension of 3-methoxy-quinoxaline-5-carbaldehyde (prepared as described in WO 2006/032466, 5.0 g, 26.57 mmol) in EtOH (200 mL) cooled at 0° C., NaBH4 (1.1 g) was added in one portion. The reaction mixture was warmed to rt and THF (50 mL) was added. A clear solution was obtained. The mixture was further stirred at rt for 30 min. Water (200 mL) was added and the volatiles were removed in vacuo. The residue was filtered off, washed with water. The solid was dried under HV to afford the title alcohol as a brown solid (4.8 g, 95% yield).
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