反应详情

温度

90 °C

2-Amino-5-iodo-4-trifluoromethyl-benzoic acid methyl ester (300 mg, 0.87 mmol) and 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)1H-pyrazole (181 mg, 1.0 equiv), K2CO3 (303 mg, 2.5 equiv.) and triphenylphosphine (45 mg. 0.2 equiv) were weighed in air and added in a flame-dried flask. Bis(dibenzylidenacetone)palladium (25 mg, 0.05 equiv) was added and the flask was closed by a septum. Dioxane (6 mL) was added and the mixture was stirred for 18 h (TLC control) at 90° C. The catalyst was filtered off and washed with EtOAc, the filtrate was evaporated to dryness. The crude product was purified by column chromatography (silica gel 60, EtOAc/hexanes 1/3 to 1/2) to give 2-amino-5-(1-methyl-1H-pyrazol-4yl)-4-trifluoromethyl-benzoic acid methyl ester (0.57 mmol, 66%) as a white solid. ESI-MS: m/z 300 [M+H]+, rt: 4.97 min.

1. additionadded in a flame-dried flask
2. customthe flask was closed by a septum
3. filtrationThe catalyst was filtered off
4. washwashed with EtOAc
5. customthe filtrate was evaporated to dryness
6. customThe crude product was purified by column chromatography (silica gel 60, EtOAc/hexanes 1/3 to 1/2)