反应详情

To a solution of 2-((3R,5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-methyl-2-oxo-1-((S)-1-oxobutan-2-yl)piperidin-3-yl)acetic acid (70 mg, 0.151 mmol; Example 210, Step A) in DCE (3 mL) was added 45.9 mg (0.303 mmol) of 3,3-dimethylmorpholine hydrochloride (Cottle, D.; Jeltsch, A.; Stoudt, T.; Walters, D. Journal of Organic Chemistry. 1946, 11(3), 286-91.; Note: reference is for the free base) and sodium triacetoxyborohydride (64.2 mg, 0.303 mmol). After stirring overnight, the mixture was diluted with sat. aq. NH4Cl solution. The mixture was extracted with DCM (2×). The combined organic layers were washed with sat. aq. NaCl solution, dried over anhydrous Na2SO4, filtered and the filtrate was concentrated. The residue was purified by preparative thin layer chromatography on silica gel (eluent: 50% ethyl acetate/hexanes). The product containing fractions were pooled, concentrated and repurified by preparative thin layer chromatography on silica gel (eluent: 10% MeOH/DCM) to afford the title compound.

1. extractionThe mixture was extracted with DCM (2×)
2. washThe combined organic layers were washed with sat. aq. NaCl solution
3. dry with materialdried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationthe filtrate was concentrated
6. customThe residue was purified by preparative thin layer chromatography on silica gel (eluent: 50% ethyl acetate/hexanes)
7. additionThe product containing fractions
8. concentrationconcentrated
9. customrepurified by preparative thin layer chromatography on silica gel (eluent: 10% MeOH/DCM)