反应详情

温度

95 °C

A mixture of 4-chloro-6-(2,6-diethyl-phenyl)-2-methyl-nicotinic acid ethyl ester (251 mg, 0.76 mmol), triethylborane (4.6 mL of 1 M solution in hexane, 4.6 mmol), Pd(PPh3)4 (26 mg, 0.023 mmol), and Na2CO3 (1.27 g, 6 mL of 2M solution in H2O) in toluene (20 mL) is heated for 48 hours at 95° C. After cooling to room temperature the mixture is diluted with water (10 mL) and extracted with EtOAc. The combined extracts are washed with saturated brine, dried (Na2SO4), concentrated, and purified by flash chromatography (elution with hexane/EtOAc 10:1) to yield 159 mg 6-(2,6-diethyl-phenyl)-4-ethyl-2-methyl-nicotinic acid ethyl ester as a colorless oil: 1H NMR (CDCl3) 7.29 (dd, 1H), 7.13 (d, 2H), 7.00 (s, 1H), 4.47 (q, 2H), 2.68 (q, 2H), 2.59 (s, 3H), 2.0-2.3.7 (m, 4H), 1.45 (t, 3H), 1.24 (t, 3H), 1.05 (t, 6H).

1. temperatureAfter cooling to room temperature the mixture
2. extractionextracted with EtOAc
3. washThe combined extracts are washed with saturated brine
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated
6. custompurified by flash chromatography (elution with hexane/EtOAc 10:1)