Hydrochloric Acid → (S)-2-(5-Bromo-2-fluoro-phenyl)-2-methyl-oxirane

Temperatur

2.5 °C

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).

1. customat 0-5° C
2. extractionextracted with CH2Cl2
3. washCombined extracts were washed with 1N HCl, H2O and saturated NaHCO3 solution
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. dissolutionThe crude mesylate was dissolved in TBME (500 ml)
8. stirring200 ml 2N aqueous NaOH and after stirring for 2 h at 25° C. the mixture
9. extractionwas extracted with TBME
10. washCombined extracts were washed with NaH2PO4 solution and brine
11. dry with materialdried over MgSO4
12. filtrationfiltered
13. concentrationconcentrated
14. customto provide the (S)-enantiomer as a colorless oil
15. customHPLC RtH5=1.186 min

ORD-Eintrag

ord-fa21b7766c8240af95091ef8811dfd91

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08846658B2