反应详情

A solution of racemic 3-[4-(7-{[2-(trimethylsilyl)ethoxy]methyl}-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]butanenitrile (37, 38.3 g, 0.1 mmol) in a mixture of ethanol and hexanes (15:85 by volume) was injected into preparative HPLC system equipped with achiral column (30×250 mm) packed with silica gel coated with cellulose tri(3,5-dimethylphenyl carbamate) (Available at Chiral technologies Inc. as Chiralcel® OD-H, 5 μm). The column was eluted with mobile phase made by a mixture of ethanol (EtOH) and hexanes in a 15 to 85 volume ratio at a flow rate of 32 mL/min at room temperature. The column elution was monitored by UV detection at a wavelength of 220 nm. Under these conditions, a baseline separation of the two enantiomers was achieved and the retention times were 15.1 minutes (Peak 1, the undesired (R)-enantiomer (R)-38) and 19.6 minutes (Peak 2, the desired (S)-enantiomer (S)-38), respectively. Each injection was 0.5 mL of feed solution at a concentration of 200 mg/mL and the cycle time for each injection was 14 minutes by using stack injections. A total of 384 injections were performed for this separation process. Fractions for Peak 1 (the undesired (R)-enantiomer, (S)-38) and Peak 2 (the desired (S)-enantiomer, (S)-38) were collected separately from each injection, and fractions collected for each peak were concentrated under reduced pressure. The residue from each evaporator was further dried under high vacuum to constant weight to afford ((S)-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)butanenitrile ((S)-38, 17.43 g, 19.15 g theoretical, 91% yield) from Peak 2 as off-white solids and (R)-3-(4-(7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)butanenitrile ((R)-38, 17.8 g, 19.15 g theoretical, 93% yield) from Peak 1 as off-white solids.

1. customequipped with achiral column (30×250 mm)
2. washThe column was eluted with mobile phase
3. additionmade by a mixture of ethanol (EtOH) and hexanes in a 15 to 85 volume ratio at a flow rate of 32 mL/min at room temperature
4. washThe column elution
5. customUnder these conditions, a baseline separation of the two enantiomers
6. custom19.6 minutes
7. waitthe cycle time for each injection was 14 minutes
8. customFractions for Peak 1 (the undesired (R)-enantiomer, (S)-38) and Peak 2 (the desired (S)-enantiomer, (S)-38) were collected separately from each injection, and fractions
9. customcollected for each peak
10. concentrationwere concentrated under reduced pressure
11. customThe residue from each evaporator
12. customwas further dried under high vacuum to constant weight