Methyl iodide → 2-acetyl-5-bromo-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide

HRID 595604Notes

Reaction equation

[C:1]([C:4]1[O:5][C:6]2[CH:16]=[C:15]([NH:17][S:18]([CH3:21])(=[O:20])=[O:19])[C:14]([Br:22])=[CH:13][C:7]=2[C:8]=1[C:9]([NH:11][CH3:12])=[O:10])(=[O:3])[CH3:2].[C:23]([O-])([O-])=O.[K+].[K+].CI>CN(C=O)C>[C:1]([C:4]1[O:5][C:6]2[CH:16]=[C:15]([N:17]([CH3:23])[S:18]([CH3:21])(=[O:19])=[O:20])[C:14]([Br:22])=[CH:13][C:7]=2[C:8]=1[C:9]([NH:11][CH3:12])=[O:10])(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 60 °C

Procedure

To a solution of 2-acetyl-5-bromo-N-methyl-6-(methylsulfonamido)benzofuran-3-carboxamide (150 mg, 0.38 mmol) in DMF (3 mL) was added K2CO3 (160 mg, 1.16 mmol) and MeI (164 mg, 1.16 mmol). The mixture was heated at 60° C. for 1 hour, concentrated in vacuo to remove DMF and extracted with EtOAc. The combined organic layers were washed with brine, dried over Na2SO4, and concentrated to give crude product. The crude product was purified by column chromatography to give 2-acetyl-5-bromo-N-methyl-6-(N-methylmethylsulfonamido)benzofuran-3-carboxamide (70 mg, yield: 45%). 1H-NMR (CDCl3, 400 MHz) δ 9.73 (s, 1H), 9.01 (s, 1H), 7.78 (s, 1H), 3.35 (s, 3H), 3.09 (s, 3H), 3.02 (d, J=4.8 Hz, 3H), 2.77 (s, 3H). MS (M+H)+: 403/405.

Workup

concentrationconcentrated in vacuo
customto remove DMF
extractionextracted with EtOAc
washThe combined organic layers were washed with brine
dry with materialdried over Na2SO4
concentrationconcentrated
customto give crude product
customThe crude product was purified by column chromatography

Sources & evidence

ORD record: ord-b240ea58c2a2442190108c6bf19a0542
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09242998B2

Reaction notes

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