反応 #1885018

反応方程式

potassium carbonate

2-(4-iodophenyl)benzoxazole

2-bromophenylboronic acid

tri(o-tolyl)phosphine

→

powdery white solid

収率 29.0%

2-(2′-bromobiphenyl-4-yl)benzoxazole

収率 29.0%

溶媒

1,2-dimethoxyethane

反応条件

後処理

1. 1
   その他Into a 100 mL three-neck flask were put
2. 2
   その他After the mixture was degassed under low pressure
3. 3
   workup.ADDITIONAfter the stirring, toluene was added into the mixture
4. 4
   洗浄the organic layer was washed with a saturated aqueous solution of sodium carbonate and brine in this order
5. 5
   workup.ADDITIONAfter the washing, magnesium sulfate was added into the organic layer
6. 6
   その他to dry the organic layer
7. 7
   ろ過After the drying, the mixture was subjected to suction filtration
8. 8
   その他to give a filtrate
9. 9
   ろ過The obtained filtrate was subjected to suction filtration through Celite (manufactured by Wako Pure Chemical Industries, Ltd., Catalog No. 531-16855)
10. 10
    その他to give a filtrate
11. 11
    濃縮The obtained filtrate was concentrated
12. 12
    その他purification by silica gel column chromatography
13. 13
    濃縮An obtained fraction was concentrated
14. 14
    その他to give a solid
15. 15
    その他The obtained solid was recrystallized with a mixed solvent of chloroform and hexane

実験手順

Into a 100 mL three-neck flask were put 7.0 g (22 mmol) of 2-(4-iodophenyl)benzoxazole, 4.4 g (22 mmol) of 2-bromophenylboronic acid, 0.049 g (0.22 mmol) of palladium(II) acetate, and 0.46 g (1.5 mmol) of tri(o-tolyl)phosphine. Into the mixture were added 60 mL of 1,2-dimethoxyethane (DME) and 30 mL of a 2M aqueous solution of potassium carbonate. After the mixture was degassed under low pressure, the atmosphere in the flask was substituted by nitrogen. This mixture was stirred at 90° C. for 10 hours. After the stirring, toluene was added into the mixture and the organic layer was washed with a saturated aqueous solution of sodium carbonate and brine in this order. After the washing, magnesium sulfate was added into the organic layer to dry the organic layer. After the drying, the mixture was subjected to suction filtration to give a filtrate. The obtained filtrate was subjected to suction filtration through Celite (manufactured by Wako Pure Chemical Industries, Ltd., Catalog No. 531-16855) to give a filtrate. The obtained filtrate was concentrated, and purification by silica gel column chromatography was performed. The column chromatography was performed first using a mixed solvent of chloroform and hexane (chloroform:hexane=1:4) as a developing solvent and then using a mixed solvent of chlorofoini and hexane (chloroform:hexane=1:1) as a developing solvent. An obtained fraction was concentrated to give a solid. The obtained solid was recrystallized with a mixed solvent of chloroform and hexane to give 2.2 g of a powdery white solid in a yield of 29%.

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