Sodium Carbonate → 4-(4-methoxy-3-nitro-phenyl)-3,6-dihydro-2H-pyran

HRID 968540Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6](B2OC(C)(C)C(C)(C)O2)=[CH:5][C:4]=1[N+:18]([O-:20])=[O:19].[O:21]1[CH2:26][CH:25]=[C:24](OS(C(F)(F)F)(=O)=O)[CH2:23][CH2:22]1.C(=O)([O-])[O-].[Na+].[Na+]>C(O)C.C1(C)C=CC=CC=1.[CH-]1C=C(P(C2C=CC=CC=2)C2C=CC=CC=2)C=C1.[CH-]1C=C(P(C2C=CC=CC=2)C2C=CC=CC=2)C=C1.Cl[Pd]Cl.[Fe+2]>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:24]2[CH2:25][CH2:26][O:21][CH2:22][CH:23]=2)=[CH:5][C:4]=1[N+:18]([O-:20])=[O:19]

Participants

Conditions

Temperature: 80 °C

Procedure

To a stirred solution of 4.36 g (15.6 mmol) 2-(4-methoxy-3-nitro-phenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (VII) and 3.30 g (14.2 mmol) trifluoromethanesulfonic acid 3,6-dihydro-2H-pyran-4-yl ester in 33 ml ethanol and 82 ml toluene was added 580 mg (0.71 mmol) dichloro(1,1′-bis(diphenylphosphino)ferrocene)palladium(II) dichloromethane adduct. The mixture was heated at 80° C. and 16.5 ml (33.0 mmol) 2 M aqueous sodium carbonate solution was added dropwise. The reaction mixture was stirred for 20 minutes at 80° C. and then cooled to room temperature, poured onto water, and extracted three times with ethyl acetate. The combined organic phases were dried over sodium sulfate and concentrated in vacuo. Flash chromatography (¼ ethyl acetate/hexane) afforded 2.00 g (60%) 4-(4-methoxy-3-nitro-phenyl)-3,6-dihydro-2H-pyran (VIII) as a light yellow solid. ES-MS m/e (%): 253 (M+NH4+, 100), 236 (M+H+, 24).

Workup

temperaturecooled to room temperature
additionpoured onto water
extractionextracted three times with ethyl acetate
dry with materialThe combined organic phases were dried over sodium sulfate
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-8ef5d5f89602415e8f1060938eeb6a67
Source dataset: uspto-grants-2007_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07304058B2

Reaction notes

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