反应详情

To a solution of cis-2-[4-(4-hydroxy-cyclohexyl)-phenyl]-8-oxa-2-aza-spiro[4.5]decan-1-one (Intermediate 20) (280 mg. 0.85 mmol) in DCM (5 mL) was added Et3N (20.2 mL, 1.7 mmol, 2 equiv.). The solution was cooled to an ice-water bath and then de-aerated by vacuum/nitrogen exchange. To this solution was transferred a solution of methanesulfonyl chloride (146 mg, 1.2 mmol, 1.5 equiv.) in DCM (2 mL). The clear solution was stirred with the ice-water bath on all the time for 1 h. TLC (50% EtOAc in heptane) indicated that the reaction was complete. The reaction was quenched by diluting with DCM (10 mL), followed by addition of NaHCO3 aq. (5 mL). The two layers were separated and the aqueous layer was extracted with DCM (2×5 mL). The combined extracts were washed successively with NaHCO3 aq. (5 mL), brine (5 mL) and dried (K2CO3). The solution was filtered through a silica gel pad, eluted with 5% MeOH in DCM to afford 300 mg (87%) of the title compound as a white solid.

1. temperatureThe solution was cooled to an ice-water bath
2. customThe reaction was quenched
3. additionby diluting with DCM (10 mL)
4. additionfollowed by addition of NaHCO3 aq. (5 mL)
5. customThe two layers were separated
6. extractionthe aqueous layer was extracted with DCM (2×5 mL)
7. washThe combined extracts were washed successively with NaHCO3 aq. (5 mL), brine (5 mL)
8. dry with materialdried (K2CO3)
9. filtrationThe solution was filtered through a silica gel pad
10. washeluted with 5% MeOH in DCM