反応 #2146693

反応方程式

2-(4′-benzoyloxyphenyl)-6-methoxyimidazo[1,2-a]pyridine

boron tribromide

methanol

→

2-(4′-hydroxyphenyl)-6-hydroxyimidazo[1,2-a]pyridine

収率 89.5%

溶媒

dichloromethane

反応条件

後処理

1. 1
   その他to remove moisture
2. 2
   workup.DISSOLUTIONwas dissolved in 245 mL of chloroform
3. 3
   温度After the temperature of the resulting solution was raised to room temperature
4. 4
   その他After the completion of the reaction
5. 5
   温度the reaction solution was cooled with ice
6. 6
   workup.STIRRINGfurther stirred at room temperature for 3 hours
7. 7
   濃縮The reaction mixture was then concentrated under reduced pressure
8. 8
   その他to obtain slurry
9. 9
   その他precipitates
10. 10
    ろ過were filtered
11. 11
    その他recovered
12. 12
    その他The precipitates recovered
13. 13
    洗浄were washed with chloroform
14. 14
    その他dried under reduced pressure

実験手順

4.90 g (corresponding to 14.83 mmol) of 2-(4′-benzoyloxyphenyl)-6-methoxyimidazo[1,2-a]pyridine that was sufficiently dried to remove moisture was dissolved in 245 mL of chloroform and cooled down to −15° C. To this solution, a solution of 12.62 mL (corresponding to 133.48 mmol) of boron tribromide in 134 mL of dichloromethane was added dropwise. After the temperature of the resulting solution was raised to room temperature, the solution was stirred for 17 hours. After the completion of the reaction, the reaction solution was cooled with ice and supplemented with 668 mL of methanol, and further stirred at room temperature for 3 hours. The reaction mixture was then concentrated under reduced pressure. The resulting crude product was supplemented with 290 mL of chloroform and 29 mL of methanol to obtain slurry, and then precipitates were filtered and recovered. The precipitates recovered were washed with chloroform and then dried under reduced pressure, to obtain 3.00 g (corresponding to 13.28 mmol) of 2-(4′-hydroxyphenyl)-6-hydroxyimidazo[1,2-a]pyridine (FIG. 3, Step 6).

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