Hydrochloric Acid → Tert-butyl 4-(3-oxo-4-phenylbutanoyl)piperidine-1-carboxylate

HRID 1635951Notes

Reaction equation

HRID 1635951 reaction equation
[H-].[Na+].[C:3]([CH:6]1[CH2:11][CH2:10][N:9]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:8][CH2:7]1)(=[O:5])[CH3:4].[C:19]1([CH2:25][C:26](OC)=[O:27])[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.Cl>C1COCC1.CCOCC>[C:15]([O:14][C:12]([N:9]1[CH2:8][CH2:7][CH:6]([C:3](=[O:5])[CH2:4][C:26](=[O:27])[CH2:25][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)[CH2:11][CH2:10]1)=[O:13])([CH3:18])([CH3:17])[CH3:16]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 7559Methyl phenylacetateHCID 24758Sodium hydrideHCID 109879834-Acetyl-piperidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 18187492Tert-butyl 4-(3-oxo-4-phenylbutanoyl)piperidine-1-carboxylate

Reagents, catalysts & solvents 2

HCID 3283Diethyl EtherSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

To a suspension of 60% sodium hydride (1.07 g) in THF (15 mL) at 0° C. was added a solution of 4-acetyl-1-(t-butoxycarbonyl)-piperidine from Step B2 (3.03 g, 13.3 mmol) and methyl phenylacetate (6.01 g, 39.9 mmol) in THF (6 mL) over 20 min. The reaction was stirred for another 4 h as it was allowed to warm to rt. The mixture was diluted with ether (30 mL) and poured into 1N HCl. The layers were separated and the aqueous layer was extracted three times with ether. The combined organic layers were washed with brine (150 mL), dried over sodium sulfate and concentrated. The crude product was purified by FC (20% ethyl acetate in hexanes) to give the title compound. Rf: 0.30 (20% ethyl acetate in hexane). Its NMR was the same as that obtained from the product of Method A above.

Workup

  1. customThe layers were separated
  2. extractionthe aqueous layer was extracted three times with ether
  3. washThe combined organic layers were washed with brine (150 mL)
  4. dry with materialdried over sodium sulfate
  5. concentrationconcentrated
  6. customThe crude product was purified by FC (20% ethyl acetate in hexanes)

Sources & evidence

ORD record
ord-97c70c0a1deb42b3a4c9e6a447a374bf
Source dataset
uspto-grants-2003_01
Patent number
US06511994B2

Reaction notes

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