Methanol → (2S)-Methyl-[5-(1,3,5-trimethyl-1H-pyrazol-4-yl)-1,2,3,4-tetrahydro-naphthalen-2-yl]-amine

HRID 420778Notes

Reaction equation

HRID 420778 reaction equation
[CH2:1]([N:8](C)[C@H:9]1[CH2:18][CH2:17][C:16]2[C:11](=[CH:12][CH:13]=[CH:14][C:15]=2[C:19]2[C:20]([CH3:26])=[N:21][N:22]([CH3:25])[C:23]=2[CH3:24])[CH2:10]1)C1C=CC=CC=1.CO>C1COCC1.[Pd]>[CH3:1][NH:8][C@H:9]1[CH2:18][CH2:17][C:16]2[C:11](=[CH:12][CH:13]=[CH:14][C:15]=2[C:19]2[C:20]([CH3:26])=[N:21][N:22]([CH3:25])[C:23]=2[CH3:24])[CH2:10]1

Participants

5

Reactant 2

HCID 887MethanolHCID 24989526(2S)-benzyl-methyl-[5-(1,3,5-trimethyl-1H-pyrazol-4-yl)-1,2,3,4-tetrahydro-naphthalen-2-yl]-amine

Product 1

HCID 24875363(2S)-Methyl-[5-(1,3,5-trimethyl-1H-pyrazol-4-yl)-1,2,3,4-tetrahydro-naphthalen-2-yl]-amineYield 91.6%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 8028TetrahydrofuranSolvent

Procedure

A solution of (2S)-benzyl-methyl-[5-(1,3,5-trimethyl-1 H-pyrazol-4-yl)-1,2,3,4-tetrahydro-naphthalen-2-yl]-amine (3.70 g, 10.291 mmol) in THF (20 mL) was added to Pd/C (1.20 g, 10% weight of Pd on activated carbon), and MeOH (120 mL) was added to the suspension. The reaction mixture was stirred under H2 overnight (ca. 16 h). It was filtered through Celite washing with AcOEt (2×100 mL) and the solvent was concentrated off to give 2.54 g of the methylamine as pale brown oil. The crude was purified by flash chromatography on silica gel (10-20-60% MeOH/CH2Cl2), to yield 2.05 g of the title product (Rf=0.3 (AcOEt/MeOH/Et3N 20:3:2), pale yellow coloured oil, 74% yield).

Workup

  1. additionwas added to the suspension
  2. filtrationIt was filtered through Celite
  3. washwashing with AcOEt (2×100 mL)
  4. concentrationthe solvent was concentrated off

Sources & evidence

ORD record
ord-b74cfacba8b14fc0af6136c1544d9f98
Source dataset
uspto-grants-2012_01
Patent number
US08097641B2

Reaction notes

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