반응 #48300

반응 방정식

1-Iodo-4-(trifluoromethyl)benzene

dicyclohexylphosphino-2′,6′-dimethoxy-1,1′-biphenyl

Iodine

(R)-methyl 2-(tert-butoxycarbonyl)-3-iodopropanoate

→

(S)-methyl 2-(tert-butoxycarbonyl)-3-(4-(trifluoromethyl)phenyl)propanoate

용매

DMF

반응 조건

후처리

1. 1
   온도the solid mixture was heated under vacuum for 10 minutes
2. 2
   기타The flask was flushed with nitrogen three times
3. 3
   온도to cool
4. 4
   workup.ADDITIONDMF (0.5 mL, degassed with nitrogen) was added
5. 5
   workup.ADDITIONwas added dropwise
6. 6
   workup.WAITto come to RT for 30 minutes
7. 7
   기타The flask was purged with nitrogen
8. 8
   온도heated at 40° C
9. 9
   workup.WAITAfter 3 hours the reaction was allowed
10. 10
    온도to cool
11. 11
    기타partitioned between EtOAc
12. 12
    추출The aqueous layer was extracted with EtOAc
13. 13
    세척the combined organic layers were washed with water, brine
14. 14
    건조dried over sodium sulfate
15. 15
    농축Concentration and purification by silica gel chromatography (6:1 Hexanes/EtOAc)

실험 절차

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.

출처