Cesium carbonate → HCID 59452985, compound

Participants

Reaction Conditions

Reaction Steps

To 4-bromo-2-nitroanisole (2.02 g, 8.72 mmol) and 1,4′-bipiperidine (3.49 g, 20.7 mmol) in dioxane (80 mL) was added sequentially, cesium carbonate (6.74 g, 20.7 mmol), palladium (II) acetate (0.196 g, 0.870 mmol) and di-tert-butylphosphino-biphenyl (0.527 g, 1.77 mmol). The reaction was heated at 100° C. for 24 hours, filtered through Celite®, concentrated and purified by flash chromatography. The residue was taken up in EtOAc (100 mL) and Pd on carbon was added in one portion. The mixture was stirred at rt under H2 (1 atm.) until complete by TLC. The reaction was filtered through Celite® and concentrated to provide the title compound of step A (0.667 g, 2.31 mmol, 26% over two steps). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.32-1.40 (m, 2H), 1.43-1.54 (m, 6H), 1.73 (d, J=12.1 Hz, 2H), 2.18-2.28 (m, 1H), 2.41-2.47 (m, 6H), 3.43 (d, J=12.5 Hz, 2H), 3.65 (s, 3H), 4.52 (s, 2H), 6.06 (dd, J=8.6, 2.7 Hz, 1H), 6.28 (d, J=2.9 Hz, 1H), 6.60 (d, J=8.8 Hz, 1H).

Provenance & Evidence