反应详情

To a solution of 4-(5-chloropyridin-3-yl)-2-[(1RS)-1-(3-fluoropyridin-2-yl)-1-hydroxyethyl]-3-[(trans-4-methylcyclohexyl)methyl]-3H-imidazo[4,5-c]pyridine-6-carbonitrile (156 mg, 0.31 mmol) in CH2Cl2 (10.0 mL) at −40° C. under a nitrogen atmosphere was added DAST (0.08 mL, 0.22 mmol), and the resulting solution was stirred at this temperature for 1 hour. The reaction mixture was then quenched with a saturated aqueous solution of NaHCO3 (5 mL) and extracted with CH2Cl2 (2×15 mL). The combined organic layers were washed with brine (10 mL), dried over anhydrous Na2SO4, filtered, and concentrated. Purification of the resulting residue on a silica gel column (0 to 100% ethyl acetate/hexanes) afforded 4-(5-chloropyridin-3-yl)-2-[(1RS)-1-fluoro-1-(3-fluoropyridin-2-yl)ethyl]-3-[(trans-4-methylcyclohexyl)methyl]-3H-imidazo[4,5-c]pyridine-6-carbonitrile. MS APCl calcd. for C27H25ClF2N6 [M+H]+ 507. found 507. The two enantiomers were separated on a chiralpak-AD column (15% IPA/heptane) to afford faster eluting Enantiomer A and slower eluting Enantiomer B.

1. customThe reaction mixture was then quenched with a saturated aqueous solution of NaHCO3 (5 mL)
2. extractionextracted with CH2Cl2 (2×15 mL)
3. washThe combined organic layers were washed with brine (10 mL)
4. dry with materialdried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification of the resulting residue on a silica gel column (0 to 100% ethyl acetate/hexanes)