反应详情

To a solution of 3-(4-isopropylpyrimidin-2-yl)-1H-indole-5-carbohydrazide (400 mg in about 60% pure) in DMF (3 mL) at RT was added N-ethyl-N-isopropylpropan-2-amine (0.47 mL, 2.71 mmol) followed by CDI (242 mg, 1.49 mmol). The mixture was stirred at RT for 5 min then heated in an oil bath at 65° C. for 1 h. It was cooled to RT, treated with 5 mL of H2O and extracted with 3×20 mL of EtOAc. The combine organic solution was washed with 3 mL of brine, dried and concentrated to afford 5-(3-(4-isopropylpyrimidin-2-yl)-1H-indol-5-yl)-1,3,4-oxadiazol-2(3H)-one (350 mg). This material was used in next step without further purification. MS (ESI, pos. ion) m/z: 322.0 (M+1).

1. temperaturethen heated in an oil bath at 65° C. for 1 h
2. temperatureIt was cooled to RT
3. extractionextracted with 3×20 mL of EtOAc
4. washThe combine organic solution was washed with 3 mL of brine
5. customdried
6. concentrationconcentrated