反应详情

To a solution of 2.1 g (10 mmol) of 2-trichloroacetyl-1H-pyrrole (commercially available) in CH2Cl2 (35 mL) and nitromethane (17.5 mL), 1.66 g (12.5 mmol) of AlCl3 was added in one portion. Then 2.96 g (12.5 mmol) of 5-methyl-3-(4-fluoro-phenyl)-isoxazole-4-carboxylic acid chloride (example 2, step 1) in 5 mL of CH2Cl2 was added dropwise. The reaction mixture was stirred at room temperature for 18 h before poured onto ice-water. The organic phase was separated, and the aqueous phase was extracted with diethyl ether. The combined organic solution was dried over Na2SO4, and evaporated to dryness. The obtained solid was washed extensively with petroleum ether to give 2.93 g 4-(5-methyl-3-phenyl-isoxazole-4-carbonyl)-2-trichloroacetyl-1H-pyrrole in 70% yield as yellow solid. (m/e): 414.8 (M+; 100%).

1. additionbefore poured onto ice-water
2. customThe organic phase was separated
3. extractionthe aqueous phase was extracted with diethyl ether
4. dry with materialThe combined organic solution was dried over Na2SO4
5. customevaporated to dryness
6. washThe obtained solid was washed extensively with petroleum ether