[C:1]([C:6]1[N:10]2[CH:11]=[C:12]([CH3:25])[CH:13]=[C:14]([NH:15][CH2:16][C:17]3[C:22]([CH3:23])=[CH:21][CH:20]=[CH:19][C:18]=3[CH3:24])[C:9]2=[N:8][C:7]=1[CH3:26])(OCC)=[O:2].COCCO[AlH2-]OCCOC.[Na+].O.O.O.O.C(C(C(C([O-])=O)O)O)([O-])=O.[K+].[Na+].O>C1(C)C=CC=CC=1>[CH3:26][C:7]1[N:8]=[C:9]2[C:14]([NH:15][CH2:16][C:17]3[C:22]([CH3:23])=[CH:21][CH:20]=[CH:19][C:18]=3[CH3:24])=[CH:13][C:12]([CH3:25])=[CH:11][N:10]2[C:6]=1[CH2:1][OH:2]A solution of 3-carboethoxy-2,6-dimethyl-8-(2,6-dimethylbenzylamino)imidazo[1,2-a]pyridine (0.4 g, 1.1 mmol) in 10 ml toluene was cold with ice- water, Red-AL 65% in to toluene (2.1 g, 6.6 mmol) was added after 30 min. The solution was stirred for 2 h at room temperature. 10 ml of Rochelle-salt solution (sodium potassium tartrate tetrahydrate, 35 g/250 ml water) was added dropwise, 10 ml toluene was added, the organic layer was separated and washed with water, dried over sodium sulfate and evaporated under reduced pressure. The residue was purified by column chromatography on silica gel, eluent dichloromethane:methanol 9:1, to give 0.21 g, (62%) of the title compound.
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