Acetaldehyde → HCID 59262240, compound

HRID 534770Notes

Reaction equation

HRID 534770 reaction equation
[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[C@@H:11]([CH3:22])[CH2:10]2)=[CH:4][CH:3]=1.[CH:23](=O)[CH3:24].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(N(CC)CC)C.C([O-])(O)=O.[Na+]>ClCCCl>[CH2:23]([NH:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[CH2:14][CH2:13][N:12]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[C@@H:11]([CH3:22])[CH2:10]2)=[CH:4][CH:3]=1)[CH3:24]

Participants

7

Reactant 5

HCID 177AcetaldehydeHCID 8471TriethylamineHCID 516892Sodium BicarbonateHCID 5049666Sodium triacetoxyborohydrideHCID 592622171,1-Dimethylethyl (2S)-4-[(4-aminophenyl)methyl]-2-methyl-1-piperazinecarboxylate

Product 1

HCID 59262240HCID 59262240, compoundYield 71.7%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

1,1-dimethylethyl (2S)-4-[(4-aminophenyl)methyl]-2-methyl-1-piperazinecarboxylate (D2) (0.30 g, 1 mmol), acetaldehyde (0.055 mL, 1 mmol), sodium triacetoxyborohydride (0.417 g, 2 mmol) and triethylamine (0.151 mL, 1.1 mmol) were combined in dry 1,2-DCE (15 mL) and stirred under Ar at room temperature for 48 hours. Saturated NaHCO3 (15 mL) was added and reaction mixture stirred for a further 2 hours. The aqueous layer was then extracted with DCM (×3) and the combined organic layers were dried (Na2SO4) and concentrated in vacuo. The crude material was purified by column chromatography eluting with 0-100% ether/petroleum ether to give the title compound (0.239 g). δH (CDCl3, 400 MHz) 7.11 (2H, d), 6.56 (2H, dd), 4.16 (1H, br.s), 3.78 (1H, d), 3.51 (1H, br.s), 3.42 (1H, d), 3.29 (1H, d), 3.15 (2H, q), 3.08 (1H, td), 2.75 (1H, d), 2.59 (1H, d), 2.06 (1H, dd), 1.93 (1H, m), 1.45 (9H, s), 1.25 (3H, t), 1.21 (3H, d). MS (ES+): 234.2, no molecular ion (MH+) observed.

Workup

  1. customreaction mixture
  2. stirringstirred for a further 2 hours
  3. extractionThe aqueous layer was then extracted with DCM (×3)
  4. dry with materialthe combined organic layers were dried (Na2SO4)
  5. concentrationconcentrated in vacuo
  6. customThe crude material was purified by column chromatography
  7. washeluting with 0-100% ether/petroleum ether

Sources & evidence

ORD record
ord-82e3ae4ea5424b869d032f57a03654a4
Source dataset
uspto-grants-2014_10
Patent number
US08853218B2

Reaction notes

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