Potassium Carbonate → HCID 44156374, compound
Reaction equation
C([O:4][CH:5]([C:8]1[C:13]2[N:14]3[CH2:20][CH2:19][CH2:18][N:17]([C:21]4[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=4[Cl:28])[C:15]3=[N:16][C:12]=2[C:11]([Cl:29])=[CH:10][CH:9]=1)[CH2:6][CH3:7])(=O)C.C(=O)([O-])[O-].[K+].[K+]>CO>[Cl:29][C:11]1[C:12]2[N:16]=[C:15]3[N:17]([C:21]4[CH:26]=[CH:25][C:24]([Cl:27])=[CH:23][C:22]=4[Cl:28])[CH2:18][CH2:19][CH2:20][N:14]3[C:13]=2[C:8]([CH:5]([OH:4])[CH2:6][CH3:7])=[CH:9][CH:10]=1Participants
4
Procedure
To a solution of (−)-1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propyl acetate (79.6 mg, 0476 mmol) in methanol (1.5 mL) was added potassium carbonate (36.4 mg, 0.264 mmol). The reaction mixture was stirred at room temperature for 1 hr. After the mixture was concentrated, the residue was diluted with water and extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 0-50% ethyl acetate/n-hexane gradient mixture. The resulting solid was recrystallized from ethyl acetate/n-hexane to give the title compound as a colorless powder (51.1 mg, 0.124 mmol, 71%).