反应详情

温度

0 °C

Iodine (0.0140 g, 0.0553 mmol) was added to zinc (0.542 g, 8.29 mmol) and the solid mixture was heated under vacuum for 10 minutes. The flask was flushed with nitrogen three times and allowed to cool. DMF (0.5 mL, degassed with nitrogen) was added and the suspension was cooled to 0° C. and stirred while (R)-methyl 2-(tert-butoxycarbonyl)-3-iodopropanoate (1.82 g, 5.53 mmol) in DMF (2.8 mL) was added dropwise. The mixture was stirred for 30 minutes at 0° C. and then allowed to come to RT for 30 minutes. 1-Iodo-4-(trifluoromethyl)benzene (1.50 g, 5.53 mmol), tris(dibenzylideneacetone)dipalladium (0.101 g, 0.111 mmol), and dicyclohexylphosphino-2′,6′-dimethoxy-1,1′-biphenyl (S-Phos) (0.182 g, 0.442 mmol) were added. The flask was purged with nitrogen and heated at 40° C. After 3 hours the reaction was allowed to cool and partitioned between EtOAc and an aqueous solution of ˜9:1 saturated ammonium chloride/ammonium hydroxide. The aqueous layer was extracted with EtOAc and the combined organic layers were washed with water, brine, and dried over sodium sulfate. Concentration and purification by silica gel chromatography (6:1 Hexanes/EtOAc) afforded (S)-methyl 2-(tert-butoxycarbonyl)-3-(4-(trifluoromethyl)phenyl)propanoate.

1. temperaturethe solid mixture was heated under vacuum for 10 minutes
2. customThe flask was flushed with nitrogen three times
3. temperatureto cool
4. additionDMF (0.5 mL, degassed with nitrogen) was added
5. additionwas added dropwise
6. waitto come to RT for 30 minutes
7. customThe flask was purged with nitrogen
8. temperatureheated at 40° C
9. waitAfter 3 hours the reaction was allowed
10. temperatureto cool
11. custompartitioned between EtOAc
12. extractionThe aqueous layer was extracted with EtOAc
13. washthe combined organic layers were washed with water, brine
14. dry with materialdried over sodium sulfate
15. concentrationConcentration and purification by silica gel chromatography (6:1 Hexanes/EtOAc)