N-bromobutanimide → 5-(5-Bromo-2-pyridin-4-ylfuran-3-yl)indan-1-one

HRID 1593425Notes

Reaction equation

[N:1]1[CH:6]=[CH:5][C:4]([C:7]2[O:8][CH:9]=[CH:10][C:11]=2[C:12]2[CH:13]=[C:14]3[C:18](=[CH:19][CH:20]=2)[C:17](=[O:21])[CH2:16][CH2:15]3)=[CH:3][CH:2]=1.[Br:22]N1C(=O)CCC1=O.C(=O)([O-])O.[Na+]>CN(C)C=O>[Br:22][C:9]1[O:8][C:7]([C:4]2[CH:3]=[CH:2][N:1]=[CH:6][CH:5]=2)=[C:11]([C:12]2[CH:13]=[C:14]3[C:18](=[CH:19][CH:20]=2)[C:17](=[O:21])[CH2:16][CH2:15]3)[CH:10]=1

Participants

Conditions

Temperature: 50 °C

Procedure

A solution of the product of Step 8 (1.0 g, 3.6 mmol) in dry dimethylformamide (10 ml) was treated with freshly recrystallised N-bromosuccinimide (1.42 g, 8.0 mmol) and heated at 50° C. for 1 hour. After cooling to room temperature, the reaction mixture was poured into saturated aqueous sodium hydrogen carbonate solution, extracted into dichloromethane, washed twice with brine, dried (MgSO4) and concentrated in vacuo. The residue was chromatographed on silica gel eluting with ethyl acetate to afford the title compound (0.2 g, 16%); 1H NMR (CDCl3) 8.52 (2H, d, J 8 Hz), 7.80 (1H, d, J 11 Hz), 7.49 (1H, s), 7.38 (1H, d, J 8 Hz), 7.32 (2H, d, J 8 Hz), 6.54 (1H, s), 3.17 (2H, t, J 5 Hz), 2.75 (2H, t, 5 Hz).

Workup

temperatureAfter cooling to room temperature
extractionextracted into dichloromethane
washwashed twice with brine
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customThe residue was chromatographed on silica gel eluting with ethyl acetate

Sources & evidence

ORD record: ord-b6f7d3321f9b45a2b153cfbbc4029f4f
Source dataset: uspto-grants-2007_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07297694B2

Reaction notes

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