Cesium carbonate → HCID 71080464, compound

Participants

Reaction Steps

Pd(PPh3)4 (0.018 g, 0.015 mmol) was added to a solution of (S)-ethyl 2-(2-ethyl-1-oxo-6-(trifluoromethylsulfonyloxy)-1,2,3,4-tetrahydronaphthalen-2-yl)acetate (129C, 0.3 g, 0.761 mmol) in 10 mL 1,4 dioxane-H2O (4:1) mixture under argon atmosphere, followed by cesium carbonate (0.74 g, 2.28 mmol) and Example 217B (0.313 g, 0.837 mmol). The reaction mixture was degassed for 30 min. The reaction mixture was refluxed for 12 h, and solvent was removed under reduced pressure. The residue was partitioned between ethyl acetate and water. The organic layer was separated, dried over Na2SO4, filtered and concentrated under reduced pressure. The product was purified by flash chromatography using 20% ethyl acetate in hexane to afford title compound (0.15 g, 40%) as solid. 1H NMR (400 MHz, CDCl3): δ 8.05 (s, 1H), 8.03 (s, 1H), 7.44-7.37 (m, 3H), 7.35-7.31 (m, 4H), 7.18 (m, 1H), 7.08-6.97 (m, 2H), 3.67 (s, 3H), 3.14 (m, 1H), 3.04 (d, J=16 Hz, 1H), 2.90 (m, 1H), 2.5 (d, J=16 Hz, 1H), 2.45 (m, 1H), 2.05 (m, 1H), 1.79-1.6 (m, 2H), 0.94 (t, J=7.6 Hz, 3H); ESI-MS m/z=493 (M+H)+.

Provenance & Evidence