反应详情

To a solution of 2-(5-bromopyridin-3-yl)propane-1,3-diol (0.12 g, 0.51 mmol) in DCM was added 2,2-dimethoxypropane (0.107 g, 1.03 mmol) and a catalytic amount of p-TSA. The mixture was stirred at room temperature for 3 h. The reaction mixture was quenched by the addition of sat. NaHCO3 solution and the organic layer washed successively with water and brine. The organic layer was concentrated to provide the 3-bromo-5-(2,2-dimethyl-1,3-dioxan-5-yl)pyridine (0.1 g, 71.4%), which was used without further purification. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 8.53 (m, 2H), 8.17 (t, 2H, J=2 Hz), 4.00-3.92 (m, 4H), 3.07-3.02 (m, 1H), 1.47 (s, 3H), 1.38 (s, 3H).

1. customThe reaction mixture was quenched by the addition of sat. NaHCO3 solution
2. washthe organic layer washed successively with water and brine
3. concentrationThe organic layer was concentrated