Cesium carbonate → Ethyl 1-methyl-4-(2-methyl-7-nitro-1-oxo-2,3-dihydro-1H-isoindol-4-yl)cyclohex-3-ene-1-carboxylate

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Reaction Conditions

Reaction Steps

A mixture of dioxane and water (15 mL, 4:1) was degassed for 30 min. 2-Methyl-7-nitro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,3-dihydro-1H-isoindol-1-one (373 mg, 1.19 mmol), ethyl 1-methyl-4-{[(trifluoromethyl)sulfonyl]oxy}cyclohex-3-ene-1-carboxylate (Compound 282E, 300 mg, 0.92 mmol), Pd (PPh3)4 (106 mg, 0.092 mmol), and cesium carbonate (747 mg, 2.3 mmol) were then added. The reaction mixture was heated at 70° C. for 2 h. After cooled to room temperature, the mixture was filtered and concentrated to dryness, the residue was purified by column chromatography (SiO2, 5% ethyl acetate/dichloromethane) to give 278 mg (yield: 77%) of the desired compound. 1H NMR (CDCl3, 300 MHz): δ=1.26 (t, J=6.9 Hz, 3 H), 1.76-1.78 (m, 1 H), 2.07-2.22 (m, 3 H), 2.40 (m, 1 H), 2.80-2.42 (m, 1 H), 3.21 (s, 3 H), 4.15 (q, J=6.9 Hz, 2 H), 5.92 (s, 1 H), 7.44 (d, J=8.5 Hz, 1 H), 7.70 (d, J=8.5 Hz, 1 H).

Provenance & Evidence