Potassium Carbonate → 2-[3-(1,4-dimethyl-3H-indol-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-2-methyl-propionic acid tert-butyl ester

HRID 1747411Notes

Reaction equation

[C:1]([O:5][C:6](=[O:20])[C:7]([CH3:19])([N:9]1[C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][C:12]=2[NH:11][C:10]1=[O:18])[CH3:8])([CH3:4])([CH3:3])[CH3:2].[I-].[CH3:22][N:23]1[C:31]2[C:26](=[C:27]([CH3:32])[CH:28]=[CH:29][CH:30]=2)[C:25]([CH2:33][N+](C)(C)C)=[CH:24]1.C([O-])([O-])=O.[K+].[K+]>CN(C=O)C.CCOC(C)=O>[C:1]([O:5][C:6](=[O:20])[C:7]([N:9]1[C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][C:12]=2[N:11]([CH2:33][CH:25]2[C:26]3[C:31](=[CH:30][CH:29]=[CH:28][C:27]=3[CH3:32])[N:23]([CH3:22])[CH2:24]2)[C:10]1=[O:18])([CH3:8])[CH3:19])([CH3:2])([CH3:3])[CH3:4]

Participants

Conditions

Temperature: 100 °C

Procedure

To a mixture of 2-methyl-2-(2-oxo-2,3-dihydro-benzimidazol-1-yl)-propionic acid tert-butyl ester (130 mg, 0.47 mmol) and (1,4-dimethyl-1H-indol-3-ylmethyl)-trimethylammonium iodide (250 mg, 0.73 mmol) in DMF (2.5 mL) was added K2CO3 (200 mg, 1.45 mmol). The mixture was stirred at 100° C. for 4 hours. The mixture was diluted with EtOAc (50 mL) and washed with H2O (50 mL×3). The organic layer was dried over sodium sulfate and concentrated. The resulting residue was purified by CombiFlash with 30% EtOAc in Hexane as the eluent to afford the desired 2-[3-(1,4-dimethyl-3H-indol-3-ylmethyl)-2-oxo-2,3-dihydro-benzimidazol-1-yl]-2methyl-propionic acid tert-butyl ester (138 mg, 68%).

Workup

washwashed with H2O (50 mL×3)
dry with materialThe organic layer was dried over sodium sulfate
concentrationconcentrated
customThe resulting residue was purified by CombiFlash with 30% EtOAc in Hexane as the eluent

Sources & evidence

ORD record: ord-69f75cac6ad243258b0c45d8045d17d3
Source dataset: uspto-grants-2015_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09150556B2

Reaction notes

Loading…