반응 #308908

반응 방정식

hexane EtOH

mesyl chloride

(S)-2-(5-bromo-2-fluoro-phenyl)-propane-1,2-diol

HCl

→

(S)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-oxirane

용매

hexane EtOAc

CH2Cl2

반응 조건

후처리

1. 1
   기타at 0-5° C
2. 2
   추출extracted with CH2Cl2
3. 3
   세척Combined extracts were washed with 1N HCl, H2O and saturated NaHCO3 solution
4. 4
   건조dried over MgSO4
5. 5
   여과filtered
6. 6
   농축concentrated
7. 7
   workup.DISSOLUTIONThe crude mesylate was dissolved in TBME (500 ml)
8. 8
   workup.STIRRING200 ml 2N aqueous NaOH and after stirring for 2 h at 25° C. the mixture
9. 9
   추출was extracted with TBME
10. 10
    세척Combined extracts were washed with NaH2PO4 solution and brine
11. 11
    건조dried over MgSO4
12. 12
    여과filtered
13. 13
    농축concentrated
14. 14
    기타to provide the (S)-enantiomer as a colorless oil
15. 15
    기타HPLC RtH5=1.186 min

실험 절차

To a solution of (S)-2-(5-bromo-2-fluoro-phenyl)-propane-1,2-diol (37.35 g, 150 mmol) in CH2Cl2 (400 ml) was added under argon NEt3 (41.8 ml, 300 mmol) and dropwise mesyl chloride (12.8 ml, 165 mmol) at 0-5° C. After stirring for 0.5 h at 0-5° C. the reaction mixture was added to cold 1N HCl and extracted with CH2Cl2. Combined extracts were washed with 1N HCl, H2O and saturated NaHCO3 solution, dried over MgSO4, filtered and concentrated. The crude mesylate was dissolved in TBME (500 ml) and 200 ml 2N aqueous NaOH and after stirring for 2 h at 25° C. the mixture was extracted with TBME. Combined extracts were washed with NaH2PO4 solution and brine, dried over MgSO4, filtered and concentrated to provide the (S)-enantiomer as a colorless oil: 78% ee (Chiralpak AS-H 1218, hexane-EtOH 97:3, 0.4 mL/min); TLC (hexane-EtOAc 3:1): Rf=0.69; HPLC RtH5=1.186 min; 1H NMR (360 MHz, CDCl3): δ 7:46 (dd, 1H), 7.30 (m, 1H), 6.83 (dd, 1H), 2.88 (d, 1H), 2.72 (d, 1H), 1.59 (s, 3H).

출처