反应详情

温度

-3 °C

To chiral salt ((2S,3R,4S)-4-Amino-4-(2-fluorophenyl)-2-(trifluoromethyl)tetrahydrofuran-3-yl)methanol (2S,3S)-2,3-bis(benzoyloxy)succinate (0.361 kg, 0.556 mol) was added EtOAc (1.08 L) and the suspension was cooled to −3° C. 1.0 N aq. NaOH (1.30 L) was added over 20 mins while maintaining T<5° C. After 5 mins, benzoyl isothiocyanate (80.0 mL, 594 mmol) was added over 8 mins while maintaining T<5° C. After 1 h, EtOAc (722 mL) was charged. The aq. layer was removed, and the organics were washed with sat. aq. NaHCO3 (361 mL) and sat. aq. NaCl (361 mL). The organics were filtered over celite (90 g) and rinsed with EtOAc (360 mL). The organics were concentrated under vacuum to afford a residue which was re-dissolved into CH2Cl2 (1.1 L) and concentrated to afford the title compound as yellow foam (261 g, 99% yield accounting for residual solvents) which was used in the following step. 1H NMR (500 MHz, DMSO) δ ppm 12.04 (s, 2H), 11.20 (s, 2H), 7.95 (d, J=7.4 Hz, 2H), 7.69-7.60 (m, 1H), 7.56-7.42 (m, 2H), 7.37-7.28 (m, 1H), 7.24-7.12 (m, 2H). 5.59 (t, J=4.5 Hz, 1H), 5.03 (d, J=9.7 Hz, 1H), 4.92 (d, J=9.7 Hz, 1H), 4.75-4.63 (m, 1H), 3.92-3.74 (m, 2H), 2.77-2.66 (m, 1H); 13C NMR (125 MHz, DMSO) δ ppm 179.98, 167.85, 159.75 (d, JCF=245.0 Hz), 133.44, 132.58, 129.88, 129.81, 129.04, 128.85, 126.31 (d, JCF=9.8 Hz), 124.36, 116.83 (d, JCF=23.4 Hz), 76.11 (q, JCF=31.0 Hz). 74.37 (d, JCF=6.1 Hz), 68.77 (d, JCF=3.4 Hz), 57.03, 52.23.

1. temperaturewhile maintaining T<5° C
2. temperaturewhile maintaining T<5° C
3. waitAfter 1 h
4. customThe aq. layer was removed
5. washthe organics were washed with sat. aq. NaHCO3 (361 mL) and sat. aq. NaCl (361 mL)
6. filtrationThe organics were filtered over celite (90 g)
7. washrinsed with EtOAc (360 mL)
8. concentrationThe organics were concentrated under vacuum
9. customto afford a residue which
10. concentrationconcentrated