Cesium carbonate → 4-(4-Ethoxycyclohex-1-enyl)-2-methyl-7-nitro-2,3-dihydro-isoindol-1-one

HRID 1947960Notes

Reaction equation

O1CCOCC1.[CH2:7]([O:9][CH:10]1[CH2:15][CH2:14][C:13](OS(C(F)(F)F)(=O)=O)=[CH:12][CH2:11]1)[CH3:8].[CH3:24][N:25]1[CH2:33][C:32]2[C:27](=[C:28]([N+:43]([O-:45])=[O:44])[CH:29]=[CH:30][C:31]=2B2OC(C)(C)C(C)(C)O2)[C:26]1=[O:46].C(=O)([O-])[O-].[Cs+].[Cs+]>O>[CH2:7]([O:9][CH:10]1[CH2:15][CH2:14][C:13]([C:31]2[CH:30]=[CH:29][C:28]([N+:43]([O-:45])=[O:44])=[C:27]3[C:32]=2[CH2:33][N:25]([CH3:24])[C:26]3=[O:46])=[CH:12][CH2:11]1)[CH3:8]

Participants

Conditions

Temperature: 60 °C

Procedure

Dioxane (20 mL) and water (5 mL) were taken in a three necked RB flask equipped with a nitrogen inlet and a thermometer. The solvents were deoxygenated for 15 min using nitrogen gas. Trifluoro-methanesulfonic acid 4-ethoxy-cyclohex-1-enyl ester (Compound 166D, 300 mg, 1.1 mmol), 2-methyl-7-nitro-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-2,3-dihydro-isoindol-1-one (Compound 205E, 630 mg, 1.64 mmol), tetrakis triphenyl phosphine palladium catalyst (114 mg, 0.01 mmol) and cesium carbonate (889 mg, 2.7 mmol) were added. The reaction mixture was heated to 60° C. for 3 hrs. The solvents were evaporated and the residue was purified over silica gel column using (methanol:methylene chloride: 1:99). Yield: 300 mg (86%). 1H NMR (CDCl3, 400 MHz): δ1.2 (t, 3H, J=7 Hz), 1.8-2.4 (m, 6H), 3.15 (s, 3H), 3.50-3.64 (m, 3H), 4.36 (s, 2H), 5.79 (m, 1H), 7.4 (d, 1H, J=8.1 Hz), 7.63 (d, 1H, J=8.1 Hz).

Workup

customequipped with a nitrogen inlet
customThe solvents were deoxygenated for 15 min
customThe solvents were evaporated
customthe residue was purified over silica gel column

Sources & evidence

ORD record: ord-cb8223f2f0db43e0b6351cdd4fb68ebd
Source dataset: uspto-grants-2013_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08399433B2

Reaction notes

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