Succinic Acid → (R)-5-(2-Ethylsulphonylethyl)-3-(N-methylpyrrolidin-2-ylmethyl)-1H-indole hemisuccinate
Reaction equation
[C:1]([OH:8])(=[O:7])[CH2:2][CH2:3][C:4]([OH:6])=[O:5].[CH2:9]([S:11]([CH2:14][CH2:15][C:16]1[CH:17]=[C:18]2[C:22](=[CH:23][CH:24]=1)[NH:21][CH:20]=[C:19]2[CH2:25][C@H:26]1[CH2:30][CH2:29][CH2:28][N:27]1[CH3:31])(=[O:13])=[O:12])[CH3:10]>C(O)C>[C:1]([OH:8])(=[O:7])[CH2:2][CH2:3][C:4]([OH:6])=[O:5].[CH2:9]([S:11]([CH2:14][CH2:15][C:16]1[CH:17]=[C:18]2[C:22](=[CH:23][CH:24]=1)[NH:21][CH:20]=[C:19]2[CH2:25][C@H:26]1[CH2:30][CH2:29][CH2:28][N:27]1[CH3:31])(=[O:13])=[O:12])[CH3:10].[CH2:9]([S:11]([CH2:1][CH2:2][C:3]1[CH:4]=[C:18]2[C:22](=[CH:23][CH:24]=1)[NH:21][CH:20]=[C:19]2[CH2:25][C@H:26]1[CH2:30][CH2:29][CH2:28][N:27]1[CH3:31])(=[O:13])=[O:12])[CH3:10]Participants
4
Procedure
A solution of succinic acid (69 mg) in hot ethanol (3.5 mL) was added slowly with stirring to a solution of (R)-5-(2-ethylsulphonylethyl)-3-(N-methylpyrrolidin-2-ylmethyl)-1H-indole free base (390 mg) in ethanol (3.5 mL). The solution was evaporated and the residue was triturated first with ether and then with ethyl acetate to give the title compound as a solid (375 mg): mp 59°-62° C.: [α]25D =+36° (methanol, c=0.10) Anal. Calcd for C18H26N2O2S. 0.5 C4H6O4. 0.25 CH3CO2C2H5. 0.5 H2O: C,59.00; H,7.42; H,6.68. Found: C,59.17; H,7.37; N,6.73.