2,3-Dihydrofuran → 2-(3,4,5-Trimethoxyphenyl)-2,3-dihydrofuran

HRID 736498Notes

Reaction equation

I[C:2]1[CH:3]=[C:4]([O:12][CH3:13])[C:5]([O:10][CH3:11])=[C:6]([O:8][CH3:9])[CH:7]=1.[O:14]1[CH:18]=[CH:17][CH2:16][CH2:15]1.CC([O-])=O.[K+]>CN(C=O)C.[N+](CCCC)(CCCC)(CCCC)CCCC.[Cl-].CCOC(C)=O.O.CC([O-])=O.CC([O-])=O.[Pd+2].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:9][O:8][C:6]1[CH:7]=[C:2]([CH:18]2[CH2:17][CH:16]=[CH:15][O:14]2)[CH:3]=[C:4]([O:12][CH3:13])[C:5]=1[O:10][CH3:11]

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of 5-iodo-1,2,3-trimethoxybenzene (900 mg, 3.06 mmol) and 2,3-dihydrofuran (1.16 mL, 15.3 mmol) in dry DMF (8 mL) were added PPh3 (20 mg, 0.077 mmol), KOAc (901 mg, 9.18 mmol), n-Bu4NCl (850 mg, 3.06 mmol) and Pd(OAc)2 (17 mg, 0.077 mmol). The reaction mixture was stirred 18 h at 80° C. The reaction mixture was diluted with AcOEt and water. After separation, the organic layer was washed with brine, dried over anhydrous Na2SO4, filtered and concentrated. The crude residue was then purified by flash chromatography on silica gel (AcOEt/Hexane: 20/80) to afford the title compound 287 (311 mg, 1.32 mmol, 43% yield). 1H NMR: (300 MHz, CDCl3) δ (ppm): 6.59 (s, 2H), 6.45 (m, 1H), 5.45 (dd, J=10.5, 8.4 Hz, 1H), 4.97 (m, 1H), 3.87 (s, 6H), 3.84 (s, 3H), 3.06 (m, 1H), 2.62 (m, 1H).

Workup

customAfter separation
washthe organic layer was washed with brine
dry with materialdried over anhydrous Na2SO4
filtrationfiltered
concentrationconcentrated
customThe crude residue was then purified by flash chromatography on silica gel (AcOEt/Hexane: 20/80)

Sources & evidence

ORD record: ord-63a276f2f1ea4870ac76b65c46058af4
Source dataset: uspto-grants-2009_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07595343B2

Reaction notes

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