反应详情

温度

90 °C

A mixture of 1-bromo-3,4-dichlorobenzene (5.10 g, 22.1 mmol), L-alanine (2.96 g, 33.2 mmol) copper(I) iodide (421 mg, 2.21 mmol), tri-potassium phosphate n-hydrate (15.3 g, 66.4 mmol), 2-(dimethylamino)ethanol (5.92 g, 66.4 mmol), and water (22 mL) was heated at 90° C. for 40 h, then poured onto ice water. The pH was set to 6 with 25% aq. HCl solution, and the mixture was extracted with EtOAc. The aqueous phase was acidified to pH 4.5 and extracted with EtOAc. The combined organic layers were dried (MgSO4), filtered, and evaporated. Chromatography (SiO2; EtOAc) afforded the title compound (2.71 g, 53%) as a 60:40 mixture of the (S) and (R) stereoisomers. Light brown solid, MS: 232.1 (M−H)−.

1. additionpoured onto ice water
2. extractionthe mixture was extracted with EtOAc
3. extractionextracted with EtOAc
4. dry with materialThe combined organic layers were dried (MgSO4)
5. filtrationfiltered
6. customevaporated