反应详情

温度

100 °C

A mixture of 4-hydroxy-1-(4-(methylsulfonyl)phenyl)pyridine-2(1H)-one (173 mg, 0.652 mmol), cis-tert-butyl 2-methyl-4-(methylsulfonyloxy)piperidine-1-carboxylate (191 mg, 0.652 mmol) and potassium carbonate (180 mg, 1.304 mmol) in DMF (3.0 mL) was heated at 140° C. for 6 hrs and 100° C. overnight. To the above mixture additional potassium carbonate (90 mg, 1 equiv.) was added and the reaction was heated at 120° C. for 3 hrs and then cooled to room temperature. The mixture was diluted with EtOAc and water and the aqueous layer was extracted further with EtOAc (4×). The combined organic layers were washed with brine/water (1:1, 2×), dried (Na2SO4) and evaporated under reduced pressure. The residue was purified by flash chromatography on silica gel (0-100% EtOAc/hexane) to yield trans-isomer of tert-butyl 2-methyl-4-(1-(4-(methylsulfonyl)phenyl)-2-oxo-1,2-dihydropyridin-4-yloxy)piperidine-1-carboxylate (31.4 mg, 10.4%) as an off-white solid. 1H NMR (500 MHz, CDCl3). δ 8.07 (d, J=8.25 Hz, 2H), 7.61 (d, J=8.25 Hz, 2H), 7.22 (d, J=7.70 Hz, 1H), 6.02 (dd, J=7.70, 2.20 Hz, 1H), 5.97 (d, J=2.20 Hz, 1H), 4.50-4.66 (m, 2H), 4.09-4.13 (m, 1H), 3.09 (s, 3H), 2.91-3.05 (m, 1H), 2.10-2.22 (m, 1H), 1.96-2.07 (m, 1H), 1.69-1.85 (m, 1H), 1.51-1.64 (m, 1H), 1.48 (s, 9H), 1.23 (d, J=7.15 Hz, 3H). MS (ESI) 463 (M+H).

1. temperaturethe reaction was heated at 120° C. for 3 hrs
2. temperaturecooled to room temperature
3. extractionthe aqueous layer was extracted further with EtOAc (4×)
4. washThe combined organic layers were washed with brine/water (1:1, 2×)
5. dry with materialdried (Na2SO4)
6. customevaporated under reduced pressure
7. customThe residue was purified by flash chromatography on silica gel (0-100% EtOAc/hexane)