Cesium carbonate → Ethyl 4-[4-(5-{3-cyano-4-[(1-methylethyl)oxy]phenyl}-1,2,4-oxadiazol-3-yl)-1H-indol-1-yl]butanoate

HRID 423330Notes

Reaction equation

[NH:1]1[C:9]2[C:4](=[C:5]([C:10]3[N:14]=[C:13]([C:15]4[CH:16]=[CH:17][C:18]([O:23][CH:24]([CH3:26])[CH3:25])=[C:19]([CH:22]=4)[C:20]#[N:21])[O:12][N:11]=3)[CH:6]=[CH:7][CH:8]=2)[CH:3]=[CH:2]1.Br[CH2:28][CH2:29][CH2:30][C:31]([O:33][CH2:34][CH3:35])=[O:32].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[C:20]([C:19]1[CH:22]=[C:15]([C:13]2[O:12][N:11]=[C:10]([C:5]3[CH:6]=[CH:7][CH:8]=[C:9]4[C:4]=3[CH:3]=[CH:2][N:1]4[CH2:28][CH2:29][CH2:30][C:31]([O:33][CH2:34][CH3:35])=[O:32])[N:14]=2)[CH:16]=[CH:17][C:18]=1[O:23][CH:24]([CH3:26])[CH3:25])#[N:21]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 5-[3-(1H-indol-4-yl)-1,2,4-oxadiazol-5-yl]-2-[(1-methylethyl)oxy]benzonitrile (D49) (100 mg, 0.29 mmol), ethyl 4-bromobutyrate (85 mg, 0.44 mmol) and cesium carbonate (189 mg, 0.58 mmol) in DMF (2 ml) was heated at 80° C. for 1 hour. Added ethyl 4-bromobutyrate (85 mg, 0.44 mmol) and heated overnight at 80° C. Added ethyl 4-bromobutyrate (85 mg, 0.44 mmol) and cesium carbonate (189 mg, 0.58 mmol) and heated for 24 hours. Added ethyl 4-bromobutyrate (85 mg, 0.44 mmol) and heated for 24 hours. Added ethyl 4-bromobutyrate (85 mg, 0.44 mmol) and heated for 6 hours. Added EtOAc (20 ml) and washed with water (20 ml). Dried over MgSO4 and evaporated off the solvent. The residue was crystallised from ethanol to give the title compound (55 mg) as a white solid. MS (ES) C26H26N4O4 requires 458; found 459 (MH+).

Workup

washAdded EtOAc (20 ml) and washed with water (20 ml)
dry with materialDried over MgSO4
customevaporated off the solvent
customThe residue was crystallised from ethanol

Sources & evidence

ORD record: ord-81c615eea6f249df9dcd2bdcb5ad99db
Source dataset: uspto-grants-2012_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08101775B2

Reaction notes

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