Methyl iodide → 1-tert-Butyl 4-ethyl 4-methylpiperidine-1,4-dicarboxylate

HRID 2085816Notes

Reaction equation

HRID 2085816 reaction equation
[N:1]1([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6][CH2:5][CH:4]([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:3][CH2:2]1.[Li+].[CH3:20]C([N-]C(C)C)C.C1CCCCC1.CI>C1COCC1>[CH3:20][C:4]1([C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:3][CH2:2][N:1]([C:12]([O:14][C:15]([CH3:17])([CH3:16])[CH3:18])=[O:13])[CH2:6][CH2:5]1

Participants

6

Reactant 4

HCID 6328Methyl iodideHCID 8078CyclohexaneHCID 2724682Lithium diisopropylamideHCID 27588121-Tert-butyl 4-ethyl piperidine-1,4-dicarboxylate

Product 1

HCID 162182761-tert-Butyl 4-ethyl 4-methylpiperidine-1,4-dicarboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of Example 532A (2.1 g, 8.1 mmol) in THF (81 mL) at −78° C. was treated dropwise with 1.5M LDA in cyclohexane (6.0 mL, 8.9 mmol), stirred for 30 minutes, treated dropwise with methyl iodide (0.76 mmol), 12.1 mmol), stirred for 2.5 hours, quenched with saturated NH4Cl, and extracted with diethyl ether. The combined extracts were washed with brine, dried (MgSO4), filtered and concentrated to provide the desired product. MS (DCI) m/e 272 (M+H)+.

Workup

  1. stirringstirred for 2.5 hours
  2. customquenched with saturated NH4Cl
  3. extractionextracted with diethyl ether
  4. washThe combined extracts were washed with brine
  5. dry with materialdried (MgSO4)
  6. filtrationfiltered
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-242d746e6c0b43a99c310cc78bd7bda4
Source dataset
uspto-grants-2004_04
Patent number
US06720338B2

Reaction notes

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