Allyl bromide → (3R,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one

HRID 1048231Notes

Reaction equation

HRID 1048231 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([C@@H:8]2[C@@H:13]([C:14]3[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][CH:15]=3)[NH:12][C:11](=[O:21])[CH2:10][CH2:9]2)[CH:5]=[CH:6][CH:7]=1.[Li][CH2:23][CH2:24][CH2:25]C.C(Br)C=C>C1COCC1>[CH2:25]([C@@H:10]1[CH2:9][C@H:8]([C:4]2[CH:5]=[CH:6][CH:7]=[C:2]([Cl:1])[CH:3]=2)[C@@H:13]([C:14]2[CH:15]=[CH:16][C:17]([Cl:20])=[CH:18][CH:19]=2)[NH:12][C:11]1=[O:21])[CH:24]=[CH2:23]

Participants

5

Reactant 3

HCID 7841Allyl bromideHCID 58573791(5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-oneHCID 178418339Butyllithium

Product 1

HCID 58573283(3R,5R,6S)-3-allyl-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

A 100 mL flame-dried round-bottomed flask equipped with a magnetic stir bar was charged with (5R,6S)-5-(3-chlorophenyl)-6-(4-chlorophenyl)piperidin-2-one (1.32 g, 4.12 mmol) (Example 1, Step E) and anhydrous THF (41.2 mL). This solution was cooled to 0° C. under argon and BuLi (3.30 mL, 8.24 mmol) was added. After 10 minutes allyl bromide (0.357 mL, 4.12 mmol) was added. After an additional 45 minutes the reaction was quenched by the addition of sat. aq. NH4Cl and the layers were separated. The aqueous layer was extracted with EtOAc twice and the organics were pooled, washed with sat. aq. NaCl solution, dried (MgSO4), filtered and concentrated in vacuo to provide a colorless oil. Purification using a Combiflash Companion (flash column chromatography, Teledyne Isco, Lincoln, Nebr.) with a 120 g SiO2 column and eluting with 10 to 100% EtOAc/hexanes provided the title compound.

Workup

  1. customA 100 mL flame-dried round-bottomed flask equipped with a magnetic stir bar
  2. customAfter an additional 45 minutes the reaction was quenched by the addition of sat. aq. NH4Cl
  3. customthe layers were separated
  4. extractionThe aqueous layer was extracted with EtOAc twice
  5. washwashed with sat. aq. NaCl solution
  6. dry with materialdried (MgSO4)
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customto provide a colorless oil
  10. customPurification
  11. washeluting with 10 to 100% EtOAc/hexanes

Sources & evidence

ORD record
ord-bbb9bd32b21d40bfb281f4fd6354d697
Source dataset
uspto-grants-2013_10
Patent number
US08569341B2

Reaction notes

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