Acetic Acid → tert-Butyl 4-{[2-(2-nitrophenyl)ethyl]amino}piperidine-1-carboxylate

HRID 1172288Notes

Reaction equation

HRID 1172288 reaction equation
[N+:1]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH2:10][CH2:11][NH2:12])([O-:3])=[O:2].O=[C:14]1[CH2:19][CH2:18][N:17]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:16][CH2:15]1.C(O)(=O)C.[BH3-]C#N.[Na+]>CO>[N+:1]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH2:10][CH2:11][NH:12][CH:14]1[CH2:19][CH2:18][N:17]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:16][CH2:15]1)([O-:3])=[O:2]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylateHCID 5003444Sodium cyanoborohydrideHCID 124981232-Nitrophenethylamine

Product 1

HCID 18444265tert-Butyl 4-{[2-(2-nitrophenyl)ethyl]amino}piperidine-1-carboxylate

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A stirred solution of 2-(2-nitrophenyl)ethanamine (4 g, 24 mmol) and tert-butyl 4-oxopiperidine-1-carboxylate (4.8 g, 24 mmol) in MeOH (48 ml) was brought to pH 5 by the addition of acetic acid. NaBH3CN (2.3 g, 36 mmol) was added and the reaction mixture was stirred at RT for 3 hours. The solvent was evaporated and the residue was taken up in EtOAc and sat. aq. Na2CO3. The layers were separated and the organic layer was washed with brine, dried (Na2SO4) and evaporated to dryness. Purification by column chromatography (0% to 7% MeOH in DCM) gave the desired product. LC/MS (10% to 99%): M/Z (M+H)+ (obs)=350; tR=2.22.

Workup

  1. customThe solvent was evaporated
  2. customThe layers were separated
  3. washthe organic layer was washed with brine
  4. dry with materialdried (Na2SO4)
  5. customevaporated to dryness
  6. customPurification by column chromatography (0% to 7% MeOH in DCM)

Sources & evidence

ORD record
ord-0877491e71a14f6fb2b13f0e3cdb3fbe
Source dataset
uspto-grants-2010_11
Patent number
US07834000B2

Reaction notes

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