Hydrochloric Acid → 9-(2-HYDROXY-2-PHENYLETHYL)-2,3-DIHYDROIMIDAZO[1,2-a]BENZIMIDAZOLE HYDROCHLORIDE

Reaction equation

[BH4-].[Na+].[CH2:3]([N:12]1[C:16]2[CH:17]=[CH:18][CH:19]=[CH:20][C:15]=2[N:14]2[CH2:21][CH2:22][N:23]=[C:13]12)[C:4]([C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1)=[O:5].[ClH:24]>CO>[ClH:24].[OH:5][CH:4]([C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1)[CH2:3][N:12]1[C:16]2[CH:17]=[CH:18][CH:19]=[CH:20][C:15]=2[N:14]2[CH2:21][CH2:22][N:23]=[C:13]12

Participants

Procedure

Add bit by bit 0.3 g (7.5 mmol) of sodium borohydride to a suspension of 1.94 g (7 mmol) of 9-phenacyl-2,3-dihydroimidazo[1,2-a]benzimidazole in 15 ml of methanol over a period of thirty minutes at room temperature. Continue stirring for a further four hours and leave until the next day. Add 10 ml of 10% hydrochloric acid until a pH of 2-3 is obtained and evaporate the methanol. Treat the residue with a solution of ammonium hydroxide and extract with chloroform. Recrystallise from ethanol the residue from extraction.