反应详情

温度

70 °C

In a 20 mL reaction vessel were placed 31.0 mg (136 μmol) of 6-(1H-indol-5-yl)hex-5-ene-2,4-dione and 13.2 mg (0.190 mmol) of boron oxide and they were dissolved in 0.88 mL of ethyl acetate. To the mixture under stirring at 70° C., 29 mg (0.14 mmol) of 4-(2-pyridylmethoxy)benzaldehyde and 62 μL (0.27 mmol) of triisopropyl borate were sequentially added. After the mixture was stirred at the same temperature for 1 hour, a solution of 2.7 μL (27 μmol) of piperidine in ethyl acetate (0.135 mL) was added and the mixture was further stirred for 1 hour. To the reaction mixture was added a 1:1 solution (0.4 mL) of 1 N hydrochloric acid and saturated brine at room temperature and the mixture was stirred for 5 minutes to 1 hour (further, the mixture was neutralized with a saturated sodium bicarbonate aqueous solution as needed). The resulting organic phase was directly subjected to purification by silica gel column chromatography (hexane/ethyl acetate or methylene chloride/methanol) to give 37.1 mg (65% yield) of the title compound as a yellow powder.

1. customIn a 20 mL reaction vessel
2. stirringAfter the mixture was stirred at the same temperature for 1 hour
3. stirringthe mixture was further stirred for 1 hour
4. stirringthe mixture was stirred for 5 minutes to 1 hour (further, the mixture
5. customThe resulting organic phase was directly subjected to purification by silica gel column chromatography (hexane/ethyl acetate or methylene chloride/methanol)