反応 #47779

反応方程式

potassium carbonate

4-Trifluoromethyl-phenylboronic acid

[4-(3,5-Dibromo-benzyloxy)-2-methyl-phenoxy]-acetic acid methyl ester

water

→

[4-(3,5-bis(4-trifluoromethylphenyl)-benzyloxy)-2-methyl-phenoxy]-acetic acid methyl ester

溶媒

ethanol

dioxane

反応条件

後処理

1. 1
   その他(170° C. for 10 min)
2. 2
   ろ過The resulting orange suspension is filtered
3. 3
   洗浄the solids are washed with more dioxane
4. 4
   濃縮the resulting solution is concentrated
5. 5
   その他purified by silica gel chromatography (10% to 25% ethyl acetate in hexanes)

実験手順

[4-(3,5-Dibromo-benzyloxy)-2-methyl-phenoxy]-acetic acid methyl ester 13 (0.0375 g, 0.088 mmol) is dissolved in dioxane (1 mL). 4-Trifluoromethyl-phenylboronic acid (0.0514 g, 0.27 mmol) is added, followed by water (0.01 mL), ethanol (0.01 mL), potassium carbonate (0.0557 g, 0.4 mmol), and tetrakis-(triphenylphosphino)palladium (0.117 g, 0.01 mmol). The mixture is stirred under nitrogen and subjected to microwave (170° C. for 10 min). The resulting orange suspension is filtered, the solids are washed with more dioxane, and the resulting solution is concentrated and purified by silica gel chromatography (10% to 25% ethyl acetate in hexanes) to yield [4-(3,5-bis(4-trifluoromethylphenyl)-benzyloxy)-2-methyl-phenoxy]-acetic acid methyl ester as an oil. 1H-NMR (400 MHz, CDCl3) δ=7.77-7.64 (m, 8H), 7.52 (s, 2H), 7.34 (s, 1H), 6.88 (d, J=2.8 Hz, 1H), 6.76 (dd, J=9.0, 2.8 Hz, 1H), 6.68 (d, J=9.2 Hz, 1H), 5.14 (s, 2H), 4.61 (s, 2H), 3.80 (s, 3H), 2.95 (s, 3H). 19F-NMR (376 MHz, CDCl3) δ=−62.4.

出典