1,2-Dibromoethane → 6-(2-bromoethoxy)-N-cyclohexyl-4-methyl-1H-indole-2-carboxamide

HRID 62663Notes

Reaction equation

[CH:1]1([NH:7][C:8]([C:10]2[NH:11][C:12]3[C:17]([CH:18]=2)=[C:16]([CH3:19])[CH:15]=[C:14]([OH:20])[CH:13]=3)=[O:9])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.C([O-])([O-])=O.[Cs+].[Cs+].[Br:27][CH2:28][CH2:29]Br>C(#N)C.O>[Br:27][CH2:28][CH2:29][O:20][C:14]1[CH:13]=[C:12]2[C:17]([CH:18]=[C:10]([C:8]([NH:7][CH:1]3[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6]3)=[O:9])[NH:11]2)=[C:16]([CH3:19])[CH:15]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of N-cyclohexyl-6-hydroxy-4-methyl-1H-indole-2-carboxamide (I-9A-b: 0.7 g, 2.57 mmol) in acetonitrile (20 mL) was added Cs2CO3 (1.67 g, 5.14 mmol) cooled to 0° C. followed by 1,2-dibromoethane (1.1 mL, 12.86 mmol) dropwise. The reaction mixture was stirred at room temperature for 16 h, diluted with water (20 mL) and extracted with ethyl acetate (2×100 mL). The combined ethyl acetate layers were washed with brine (100 mL), dried over anhydrous Na2SO4 and concentrated under reduced pressure. The crude compound was purified by column chromatography over silica gel (100-200 mesh) using a solvent gradient of 50% ethyl acetate in petroleum ether as eluent to afford 200 mg (21%) of 6-(2-bromoethoxy)-N-cyclohexyl-4-methyl-1H-indole-2-carboxamide (I-9A-c) as an off-white solid.

Workup

extractionextracted with ethyl acetate (2×100 mL)
washThe combined ethyl acetate layers were washed with brine (100 mL)
dry with materialdried over anhydrous Na2SO4
concentrationconcentrated under reduced pressure
customThe crude compound was purified by column chromatography over silica gel (100-200 mesh)

Sources & evidence

ORD record: ord-03f5978e40894be6a0f196790dd988c2
Source dataset: uspto-grants-2016_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09447039B2

Reaction notes

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