反应详情

To a solution of 2-pyridin-3-yl-1H-indole-5-carbonitrile (Example 8, 210 mg, 0.96 mmol) in THF (20 mL) at room temperature is added 0.5 M KHMDS in toluene (4.10 mL, 2.05 mmol). After 30 min, 3-cyanobenzoyl chloride (510 mg, 3.08 mmol) is added. The mixture is stirred under N2 overnight. The reaction is quenched with aqueous ammonium chloride and the volatiles are removed in vacuo. The residue is redissolved in dichloromethane and poured into saturated aqueous sodium bicarbonate (100 mL). Extraction with dichloromethane, drying over sodium sulfate followed by concentration affords a residue which is purified on an XBridge RP18 using a 0.1% ammonium hydroxide in acetonitrile gradient. Further purification by silica gel flash chromatography (heptane-ethyl acetate, 3:2 to 2:3) affords 1-(3-cyano-benzoyl)-2-pyridin-3-yl-1H-indole-5-carbonitrile. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.20 (d, J=0.5 Hz, 1H), 7.22-7.26 (m, 1H), 7.55 (t, J=7.8 Hz, 1H), 7.73-7.79 (m, 2H), 7.84 (d, 1H), 7.92-7.98 (m, 2H), 8.11 (t, J=1.5 Hz, 1H), 8.29-8.33 (m, 1H), 8.39 (dd, J=4.8, 1.5 Hz, 1H), 8.60 (dd, J=2.3, 0.8 Hz, 1H). HRMS (ESI) m/z 349.1106 [(M+H)+ Calcd for C22H13N4O: 349.1089].

1. customThe reaction is quenched with aqueous ammonium chloride
2. customthe volatiles are removed in vacuo
3. dissolutionThe residue is redissolved in dichloromethane
4. additionpoured into saturated aqueous sodium bicarbonate (100 mL)
5. extractionExtraction with dichloromethane
6. dry with materialdrying over sodium sulfate
7. concentrationfollowed by concentration
8. customaffords a residue which
9. customis purified on an XBridge
10. customFurther purification by silica gel flash chromatography (heptane-ethyl acetate, 3:2 to 2:3)