反应详情

To a solution of 7-chloro-2-(2-chlorophenyl)-pyrazolo[1,5-a]pyrimidine (I-1A-1c; 6.00 g, 22.7 mmol) in chloroform (23 ml) and methylene chloride (207 ml) cooled in an ice bath was added N-iodosuccinimide (7.67 g, 34.1 mmol), portionwise. The ice bath was removed and the reaction was stirred overnight at room temperature. After concentrating the red-brown reaction, in vacuo, an ethyl acetate solution of the residue was washed with saturated aqueous Na2S2O4 and brine. The solution was dried (MgSO4), concentrated, in vacuo, and the resulting solids repulped at room temperature from ethyl acetate (30 ml) to give product I-1A-1d as a solid (6.8 g, 77%): +APcI MS (M+1) 390.1; 1H NMR (400 MHz, CD2Cl2) δ 8.52 (d, J=4.6 Hz, 1H), 7.59–7.56 (m, 1H), 7.53–7.42 (m, 3H), 7.14 (d, J=4.6 Hz, 1H).

1. customThe ice bath was removed
2. concentrationAfter concentrating
3. customthe red-brown reaction
4. washin vacuo, an ethyl acetate solution of the residue was washed with saturated aqueous Na2S2O4 and brine
5. dry with materialThe solution was dried (MgSO4)
6. concentrationconcentrated, in vacuo
7. customrepulped at room temperature from ethyl acetate (30 ml)