Ether hydrochloride → 2-tert-Butyl-N-methyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-benzimidazol-5-amine

Participants

Reaction Conditions

Reaction Steps

Methyl [2-tert-butyl-1-(tetrahydro-2H-pyran-4-ylmethyl)-1H-benzimidazol-5-yl]carbamate (1.80 g, 5.21 mmol) was dissolved in 75 mL of THF at 0° C. 1M HCl/ether (7.3 mL, 7.29 mmol) was added dropwise and the solution was stirred at 0° C. for 15 min. LiAlH4 (988 mg, 26.1 mmol) was added slowly and the solution was stirred at rt overnight. The reaction was quenched at 0° C. by the addition of MeOH (5 mL) followed by water (10 mL) and the solution was left to stir at rt for 30 min. Anhydrous Na2SO4 (10 g) was added and the solution was stirred at rt for another 30 min. The solution was filtered and the solvent was evaporated. The residue was dissolved in EtOAc and washed with aqueous NaHCO3 solution, brine and dried over anhydrous MgSO4. The solvent was evaporated. Yield: 1.54 g (98%). 1H NMR (400 MHz, CHLOROFORM-D) δ 1.49-1.53 (m, 4 H), 1.53-1.57 (m, 9 H), 2.22-2.32 (m, 1 H), 2.87 (s, 3 H), 3.26-3.35 (m, 2 H), 3.95 (t, J=3.03 Hz, 1 H), 3.97-4.00 (m, 1 H), 4.13 (d, J=7.42 Hz, 2 H), 6.61 (dd, J=8.59, 2.15 Hz, 1 H), 6.99 (d, J=1.95 Hz, 1 H), 7.11 (d, J=8.59 Hz, 1 H).

Provenance & Evidence