N-bromobutanimide → 1-(4-bromo-1-(tetrahydro-pyran-2-yl)-1H-imidazol-2-yl)-2-methyl-propan-2-ol

Participants

Reaction Steps

To a solution of 2-methyl-1-[1-(tetrahydro-pyran-2-yl)-1H-imidazol-2-yl]-propan-2-ol (1.12 g, 5 mmol) in DMF (10 mL) at −78° C. was added NBS (0.72 g, 4 mmol) in DMF (pre-cooled to −78° C.). The reaction mixture was warmed to r.t. slowly and stirred at r.t. overnight. The solvent was removed under vacuum and purified by neutral Al2O3 column chromatography (CH2Cl2: MeOH=100:1) to give 0.5 gm of 1-[4-bromo-1-(tetrahydro-pyran-2-yl)-1H-imidazol-2-yl]-2-methyl-propan-2-ol (34%). 1H NMR (CDCl3, 400 MHz): δ 7.03 (s, 1H), 5.13 (dd, J=2.6, 9.6 Hz, 1H), 4.05-4.02 (m, 1H), 3.68-3.62 (m, 1H), 2.82 (d, J=12.0 Hz, 2H), 2.01-1.89 (m, 4H), 1.92 (m, 1H), 1.69-1.60 (m, 3H), 1.24 (m, 6H)

Provenance & Evidence