反应详情

To a solution cold solution (ice bath) of 7-benzyloxy-2-ethyl-1H-benzimidazole prepared above (0.8 g, 3.17 mmol) in DMF (10 mL) was added sodium hydride (0.41 g, 10.47 mmol), followed by 2-(bromomethyl)pyridine hydrobromide (0.88 g, 3.49 mmol). After addition of the bromide the reaction mixture was allowed to warm to room temperature and stirred for 16 h. The reaction mixture was partitioned between water and ethyl acetate. Ethyl acetate layer was separated, dried (MgSO4), and concentrated to give 4-benzyloxy-2-ethyl-1-pyridin2-ylmethyl-1H-benzoimidazole as a solid which was crystallized in ethyl acetate to give 4-benzyloxy-2-ethyl-1-pyridin2-ylmethyl-1H-benzoimidazole, 0.35 g. LCMS 344 (M+1). 1HNMR (400 MHz, CDCl3) δ 1.38 (t, 3H), 2.90 (q, 2H), 5.40-5.42 (m, 4H), 6.65-8.60 (12H, Ar) 4-benzyloxy-2-ethyl-1-pyridin2-ylmethyl-1H-benzoimidazole (0.35 g, 1.2 mmol) was dissolved in ethanol and in presence of Pd/C, 10% and stirred under a hydrogen balloon overnight. The solution was filtered through celite and concentrated to give 2-ethyl-1-pyridin-2-ylmethyl-1H-benzoimidazole-4-ol. 1HNMR (400 MHz, CDCl3) δ 1.28 (t, 3H), 2.87 (q, 2H), 5.40 (s, 2H), 6.49 (d, 1Har), 6.51 (m, 2H, Ar), 6.92 (m. 1H Ar), 7.09 (m, 1H, Ar), 7.73 (m, 1H, Ar), 8.49 (m, 1H, Ar), 9.57 (1H, OH).

1. customThe reaction mixture was partitioned between water and ethyl acetate
2. customEthyl acetate layer was separated
3. dry with materialdried (MgSO4)
4. concentrationconcentrated