[CH2:1]([N:3]1[C:7]2=[N:8][C:9]3[C:14]([C:15]([NH:16][CH2:17][CH:18]4[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]4)=[C:6]2[CH:5]=[N:4]1)=[CH:13][C:12]([O:24]C)=[CH:11][CH:10]=3)[CH3:2].B(Br)(Br)Br.ClCCCl.[OH-].[Na+]>O>[CH2:1]([N:3]1[C:7]2=[N:8][C:9]3[C:14]([C:15]([NH:16][CH2:17][CH:18]4[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]4)=[C:6]2[CH:5]=[N:4]1)=[CH:13][C:12]([OH:24])=[CH:11][CH:10]=3)[CH3:2]A mixture of 1-ethyl-6-methoxy-N-(cyclohexylmethyl)-1H-pyrazolo[3,4-b]quinolin-4-amine (5.4 g, 0.016 mol), boron tribromide (48 ml, 0.048 mol) and 1,2-dichloroethane (250 ml) is stirred at room temperature overnight. The reaction mixture is stirred with 1 volume of water, made basic with NaOH, and the layers are separated. The basic layer is acidified with acetic acid and the yellow precipitate that forms is collected by filtration, washed with water and dried. The product is recrystallized from hot acetonitrile/methanol to afford 1-ethyl-6-hydroxy-N-(cyclohexylmethyl)-1H-pyrazolo[3,4-b]quinolin-4-amine, as a yellow powder, m.p. 223°-224° C.
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