Cesium carbonate → tert-butyl ((3R)-3-hydroxy-3-(3-((6-oxopiperidin-2-yl)methoxy)phenyl)propyl)carbamate

Participants

Reaction Steps

To a mixture of (6-oxopiperidin-2-yl)methyl methanesulfonate (0.44 g, 2.2 mmol) in DMF (15 ml) was added Cs2CO3 (3.5 g, 11 mmol) and phenol (Intermediate I) (0.88 g, 3.3 mmol). The reaction mixture was stirred at room temperature for 40 hours and partitioned between water and ethyl acetate. Organic layer was washed with brine, dried over anhydrous Na2SO4 and concentrated under reduced pressure. Purification by flash chromatography (20% MeOH-EtOAc) gave tert-butyl ((3R)-3-hydroxy-3-(3-((6-oxopiperidin-2-yl)methoxy)phenyl)propyl)carbamate as a yellow oil. Yield (0.17 g, 20%); 1H NMR (400 MHz, CD3OD) δ 7.24 (t, J=8.0 Hz, 1H), 6.97-6.93 (m, 2H), 6.84 (d, J=8.0 Hz, 1H), 4.64 (t, J=7.2 Hz, 1H), 4.06-4.02 (m, 1H), 3.94-3.90 (m, 1H), 3.86-3.76 (m, 1H), 3.15-3.06 (m, 2H), 2.37-2.30 (m, 2H), 2.05-1.92 (m, 3H), 1.86-1.75 (m, 3H), 1.43 (s, 9H).

Provenance & Evidence