[CH3:1][N:2]1[C:10]2[C:5](=[C:6]([CH3:11])[CH:7]=[CH:8][CH:9]=2)[C:4]([CH2:12][N:13]2[C:17]3[CH:18]=[C:19]([CH3:23])[C:20]([CH3:22])=[CH:21][C:16]=3[N:15](C(C)=C)[C:14]2=[O:27])=[CH:3]1.O.Cl>CO.C(Cl)Cl>[CH3:1][N:2]1[C:10]2[C:5](=[C:6]([CH3:11])[CH:7]=[CH:8][CH:9]=2)[C:4]([CH2:12][N:13]2[C:17]3[CH:18]=[C:19]([CH3:23])[C:20]([CH3:22])=[CH:21][C:16]=3[NH:15][C:14]2=[O:27])=[CH:3]1To 1-(1,4-Dimethyl-1H-indol-3-ylmethyl)-3-isopropenyl-5,6-dimethyl-1,3-dihydro-benzimidazol-2-one (0.35 mmol) in MeOH (5 mL) was added water (5 mL) and cone. HCl (3 mL). The reaction mixture was heated to 60° C. for 2 h. The reaction mixture turned into pink in color and heterogeneous (milky solution). The TLC indicated that the reaction was complete and clean. The reaction mixture was therefore diluted with CH2Cl2 and washed with water. The organic phase remained heterogeneous (milky with fine powder). The organic phase was filtered through a fine filter to collect some of the solid which was partially soluble in DMSO-d6. 1H-NMR indicated this filtered solid being the desired product. Therefore, the organic phase was concentrated without drying with Na2SO4 to afford a pink solid. 1H-NMR of this product in DMSO-d6 matched well with the previous filtered solid.
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