Iodoethane → methyl 8-bromo-2-(ethylthio)-4-oxo-4H-chromene-6-carboxylate

HRID 1187244Notes

Reaction equation

I[CH2:2][CH3:3].[Br:4][C:5]1[CH:6]=[C:7]([C:17]([O:19][CH3:20])=[O:18])[CH:8]=[C:9]2[C:14]=1[O:13][C:12](=[S:15])[CH:11]=[C:10]2[OH:16].C(=O)([O-])[O-].[K+].[K+]>CC(C)=O>[Br:4][C:5]1[CH:6]=[C:7]([C:17]([O:19][CH3:20])=[O:18])[CH:8]=[C:9]2[C:14]=1[O:13][C:12]([S:15][CH2:2][CH3:3])=[CH:11][C:10]2=[O:16]

Participants

Conditions

Temperature: 60 °C

Procedure

Iodoethane (2.04 mL, 25.54 mmol), was added to a stirred suspension of methyl 8-bromo-4-hydroxy-2-thioxo-2H-chromene-6-carboxylate (2.3 g, 7.30 mmol) and potassium carbonate (1.21 g, 8.76 mmol) in acetone (100 mL) under argon. The resulting mixture was stirred at 60° C. for 2 hrs. The mixture was concentrated in vacuo, and the residue was pardoned between water and DCM. The aqueous layer was extracted into DCM, and the organic extracts were combined, washed with brine, dried over magnesium sulfate and evaporated. The crude product was purified by flash chromatography on silica gel eluting with 0 to 10% ethyl acetate in DCM. The solvent was evaporated to dryness to afford methyl 8-bromo-2-(ethylthio)-4-oxo-4H-chromene-6-carboxylate (1.8 g, 72%) as an orange solid. Mass Spectrum: M+H+ 343.

Workup

concentrationThe mixture was concentrated in vacuo
extractionThe aqueous layer was extracted into DCM
washwashed with brine
dry with materialdried over magnesium sulfate
customevaporated
customThe crude product was purified by flash chromatography on silica gel eluting with 0 to 10% ethyl acetate in DCM
customThe solvent was evaporated to dryness

Sources & evidence

ORD record: ord-1bd5e3264e2346e6986b847761c2fb38
Source dataset: uspto-grants-2014_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08673906B2

Reaction notes

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