Cesium carbonate → 2-Allyl-2-(4-bromo-phenyl)-6-nitro-2,3-dihydro-imidazo[2,1-b]oxazole

HRID 1446096Notes

Reaction equation

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

Participants

Conditions

Temperature: 50 °C

Procedure

To a solution of crude 2-(4-Bromo-phenyl)-1-(2-chloro-4-nitro-imidazol-1-yl)-pent-4-en-2-ol in DMF (48 mL) was added Cs2CO3 (2.84 g, 8.7 mmol) and stirred for 2 h at 50° C. The reaction mixture was cooled to rt, quenched with water, diluted with EtOAC and washed with brine and water. The organic layers were separated, dried (MgSO4) and concentrated. The concentrates were recrystallized with EuOAc to provide 270 mg of white solid. 1H NMR (400 MHz, DMSO-d) 68.11 (s, 1H), 7.64 (m, 2H), 7.38 (m, 2H), 5.80 (m, 2H), 5.12 (m, 2H), 4.62 (d, J=11.2 Hz, 1H), 4.01 (d, J=11.2 Hz, 1H), 2.96 (m, 2H); ESI MS m/z 352 (M+H+).

Workup

temperatureThe reaction mixture was cooled to rt
customquenched with water
additiondiluted with EtOAC
washwashed with brine and water
customThe organic layers were separated
dry with materialdried (MgSO4)
concentrationconcentrated
customThe concentrates were recrystallized with EuOAc

Sources & evidence

ORD record: ord-dc51a1600e184fff89352452638e4872
Source dataset: uspto-grants-2010_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07666864B2

Reaction notes

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