Pyridine 4-methylbenzene-1-sulfonate → (5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-hydroxypiperidin-2-one

HRID 932144Notes

Reaction equation

HRID 932144 reaction equation
[Si:1]([O:18][CH2:19][C@@H:20]([N:23]1[C@H:28]([C:29]2[CH:34]=[CH:33][C:32]([Cl:35])=[CH:31][CH:30]=2)[C@@H:27]([C:36]2[CH:41]=[CH:40][CH:39]=[C:38]([Cl:42])[CH:37]=2)[CH2:26][CH2:25][C:24]1=[O:43])[CH2:21][CH3:22])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[O:54]([Si](C)(C)C)O[Si](C)(C)C.C1(C)C=CC(S(O)(=O)=O)=CC=1.N1C=CC=CC=1.C([O-])(O)=O.[Na+]>C1COCC1>[Si:1]([O:18][CH2:19][C@@H:20]([N:23]1[C@H:28]([C:29]2[CH:30]=[CH:31][C:32]([Cl:35])=[CH:33][CH:34]=2)[C@@H:27]([C:36]2[CH:41]=[CH:40][CH:39]=[C:38]([Cl:42])[CH:37]=2)[CH2:26][CH:25]([OH:54])[C:24]1=[O:43])[CH2:21][CH3:22])([C:14]([CH3:17])([CH3:16])[CH3:15])([C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1

Participants

7

Reactant 5

HCID 161440Pyridine 4-methylbenzene-1-sulfonateHCID 516892Sodium BicarbonateHCID 2733832Lithium HexamethyldisilazideHCID 10058088Bis(trimethylsilyl) peroxideHCID 67999011(5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one

Product 1

HCID 67998995(5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-hydroxypiperidin-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
-78 °C

Procedure

(5R,6S)-1-((S)-1-(Tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one (1.100 g, 1.744 mmol; Example 185, Step C) was dissolved in THF (8.72 mL) and sparged with argon for 5 minutes. The mixture was cooled to −78° C. and 1.0 M lithium bis(trimethylsilyl)amide solution in THF (2.093 mL, 2.093 mmol) was added dropwise. After 30 minutes, peroxybis(trimethylsilane) (0.413 mL, 1.918 mmol) was added dropwise. After 1 hour, the cooling bath was removed. After stirring overnight, the mixture was quenched with sat. aq. NH4Cl solution and extracted with ethyl acetate. The organic layer was washed with sat. aq. NaCl solution, dried over Na2SO4, and concentrated. The residue was dissolved in EtOH (14 mL) and pyridine p-toluenesulfonate (131 mg, 0.523 mmol) was added. After 1 hour, the mixture was basified with sat. aq. NaHCO3 solution. The mixture was partitioned between ethyl acetate and water. The organic layer was washed with sat. aq. NaCl solution, dried over Na2SO4, and concentrated. The residue was purified by flash chromatography on silica gel (40 g column, eluent: 5 to 50% ethylacetate/hexanes) to afford the title compound.

Workup

  1. customsparged with argon for 5 minutes
  2. waitAfter 1 hour
  3. customthe cooling bath was removed
  4. customthe mixture was quenched with sat. aq. NH4Cl solution
  5. extractionextracted with ethyl acetate
  6. washThe organic layer was washed with sat. aq. NaCl solution
  7. dry with materialdried over Na2SO4
  8. concentrationconcentrated
  9. dissolutionThe residue was dissolved in EtOH (14 mL)
  10. waitAfter 1 hour
  11. customThe mixture was partitioned between ethyl acetate and water
  12. washThe organic layer was washed with sat. aq. NaCl solution
  13. dry with materialdried over Na2SO4
  14. concentrationconcentrated
  15. customThe residue was purified by flash chromatography on silica gel (40 g column, eluent: 5 to 50% ethylacetate/hexanes)

Sources & evidence

ORD record
ord-8b267d0e9ade41429e7b369d7452d4de
Source dataset
uspto-grants-2016_03
Patent number
US09296736B2

Reaction notes

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