反应详情

(R)-4,4,4-Trifluoro-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)butanenitrile ((R)-34) and (S)-4,4,4-Trifluoro-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)butanenitrile ((S)-34). A slurry of 1.5 Kg of 20-micron Chiralcel® OD chiral stationary phase (CSP) made by Daicel in 3.0 L of isopropanol (IPA) was packed into a PROCHROM Dynamic Axial Compression Column LC110-1 (11 cm ID×25 cm L; Column Void Vol.: approximate 1.5 L) under 150 bar of packing pressure. The packed column was then installed on a Novasep Hipersep HPLC unit. The column and HPLC system were flushed with methanol (17 L) and the mobile phase made by a mixture of isopropanol and hexane (2:8 by volume, 17 L). The feed solution was then prepared by dissolving 4,4,4-trifluoro-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)butanenitrile (33, racemic SEM-protected compound, 3100 g, 7.1 mol) in the mobile phase to a concentration of 120 g/L. The feed solution (120 mL per injection) was then sequentially injected into the preparative HPLC chiral column for separation. The chiral column was eluted with the mobile phase at a flow rate of 570 mL/min at room temperature. The column elution was monitored by UV at wavelength 330 nm. Under these conditions, a baseline separation of the two enantiomers was achieved. The cycle time for each injection was 11 minutes and a total of 210 injections were performed for this separation process. Fractions for Peak 1 (the undesired (S)-enantiomer, (S)-34) and Peak 2 (the desired (R)-enantiomer, (R)-34) were collected separately from each injection, and fractions collected for each peak were continuously concentrated at 40° C. under reduced pressure (40-120 bar). The residue from each evaporator was further dried under high vacuum to constant weight to afford (3R)-3-cyclopropyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile ((R)-34, 1457 g, 1550 g theoretical, 94%) from Peak 2 as a light yellow oil which solidified upon standing at room temperature in vacuo and (3S)-cyclopropyl-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)propanenitrile ((S)-34, 1488 g, 1550 g theoretical, 96%) from Peak 1 as an yellow oil which solidified upon standing at room temperature in vacuo.

1. customThe column and HPLC system were flushed with methanol (17 L)
2. additionthe mobile phase made by a mixture of isopropanol and hexane (2:8 by volume, 17 L)
3. customThe feed solution was then prepared
4. customThe feed solution (120 mL per injection) was then sequentially injected into the preparative HPLC chiral column for separation
5. washThe chiral column was eluted with the mobile phase at a flow rate of 570 mL/min at room temperature
6. washThe column elution
7. customUnder these conditions, a baseline separation of the two enantiomers
8. customFractions for Peak 1 (the undesired (S)-enantiomer, (S)-34) and Peak 2 (the desired (R)-enantiomer, (R)-34) were collected separately from each injection, and fractions
9. customcollected for each peak
10. concentrationwere continuously concentrated at 40° C. under reduced pressure (40-120 bar)
11. customThe residue from each evaporator
12. customwas further dried under high vacuum to constant weight