反应详情

温度

-15 °C

The 8-(1-(tert-butylsulfinylimino)ethyl)-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide was diluted in DCM (35 mL) and MeOH (35 mL), acetic acid (4.6 mL, 80.4 mmol) and sodium cyanotrihydroborate (1.9 g, 30.2 mmol) was added at −15° C. The resulting mixture was stirred at −15° C. for 5 hrs then allowed to warm to 0° C. A sat. sol. of Na2CO3 was added at 0° C. until pH˜8-9 and extracted with DCM (×2). The organic phase was washed with brine, dried over magnesium sulfate and concentrated. The crude product was purified by flash chromatography on silica gel (column SiO2, 15-40 μm-150 g Merck) eluting with 5 to 15% EtOH in DCM. The fractions containing impure product were concentrated down and repurified using the same system. The fractions containing pure 8-(1-((R)-1,1-dimethylethylsulfinamido)ethyl)-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide were combined and the solvent was evaporated to dryness to afford 2.48 g, (5.52 mmol, 54.9%) as a white foam. The fractions containing a mixture of diastereoisomers were combined, concentrated and purified by preparative HPLC on a Waters X-Bridge system. The fractions containing the desired compound were evaporated to dryness to afford a further crop of 8-(1-((R)-1,1-dimethylethylsulfinamido)ethyl)-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide (0.25 g, 0.556 mmol, 5.53%) as a white foam. These 2 batches (2.48 g) and (0.25 g) were combined to give 8-(1-((R)-1,1-dimethylethylsulfinamido)ethyl)-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide (2.73 g, 60%, diastereomeric excess >95%). Mass Spectrum: M+H+ 450.

1. temperatureto warm to 0° C
2. extractionextracted with DCM (×2)
3. washThe organic phase was washed with brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated
6. customThe crude product was purified by flash chromatography on silica gel (column SiO2, 15-40 μm-150 g Merck)
7. washeluting with 5 to 15% EtOH in DCM
8. additionThe fractions containing impure product
9. concentrationwere concentrated down
10. customrepurified
11. additionThe fractions containing pure 8-(1-((R)-1,1-dimethylethylsulfinamido)ethyl)-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide
12. customthe solvent was evaporated to dryness
13. customto afford 2.48 g, (5.52 mmol, 54.9%) as a white foam
14. additionThe fractions containing
15. additiona mixture of diastereoisomers
16. concentrationconcentrated
17. custompurified by preparative HPLC on a Waters X-Bridge system
18. additionThe fractions containing the desired compound
19. customwere evaporated to dryness