Iodoethane → (5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-ethylpiperidin-2-one

HRID 932141Notes

Reaction equation

HRID 932141 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.[CH:44]([N-]C(C)C)(C)[CH3:45].[Li+].ICC>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]([CH2:44][CH3:45])[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

5

Reactant 3

HCID 6340IodoethaneHCID 2724682Lithium diisopropylamideHCID 67999011(5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one

Product 1

HCID 67998674(5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)-3-ethylpiperidin-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
0 °C

Procedure

To a −78° C. solution of (5R,6S)-1-((S)-1-(tert-butyldiphenylsilyloxy)butan-2-yl)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one (764 mg, 1.211 mmol; Example 185, Step C) in THF (6 mL) under argon was added 1.0M lithium diisopropyl amide solution in THF (1.211 mL, 1.211 mmol). The mixture was warmed to 0° C. for 30 minutes. The mixture was cooled to −78° C. and iodoethane (0.117 mL, 1.454 mmol) was added. The resulting solution stirred at 0° C. for 1 hour. The mixture was quenched with sat. aq. NH4Cl solution. The mixture was extracted with ethyl acetate. The combined organic layers were washed with sat. aq. NaCl solution, dried over Na2SO4 and concentrated. The residue was purified by flash chromatography on silica gel (eluent: 5 to 25% ethyl acetate/hexanes) to afford the title compound as a mixture of diastereomers.

Workup

  1. temperatureThe mixture was cooled to −78° C.
  2. customThe mixture was quenched with sat. aq. NH4Cl solution
  3. extractionThe mixture was extracted with ethyl acetate
  4. washThe combined organic layers were washed with sat. aq. NaCl solution
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated
  7. customThe residue was purified by flash chromatography on silica gel (eluent: 5 to 25% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-9fb50020782149419c47e634792cf933
Source dataset
uspto-grants-2016_03
Patent number
US09296736B2

Reaction notes

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