tert-Butyl 4-(3-aminophenyl)-5,6-dihydropyridine-1(2H)-carboxylate → tert-Butyl 4-(3-aminophenyl)piperidine-1-carboxylate

HRID 1452649Notes

Reaction equation

HRID 1452649 reaction equation
[NH2:1][C:2]1[CH:3]=[C:4]([C:8]2[CH2:9][CH2:10][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:12][CH:13]=2)[CH:5]=[CH:6][CH:7]=1>C(O)C.[Pd]>[NH2:1][C:2]1[CH:3]=[C:4]([CH:8]2[CH2:9][CH2:10][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:12][CH2:13]2)[CH:5]=[CH:6][CH:7]=1

Participants

4

Reactant 1

HCID 22049056tert-Butyl 4-(3-aminophenyl)-5,6-dihydropyridine-1(2H)-carboxylate

Product 1

HCID 22049268tert-Butyl 4-(3-aminophenyl)piperidine-1-carboxylateYield 84.2%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Procedure

A mixture of tert-butyl 4-(3-aminophenyl)-3,6-dihydro-1 (2H)-pyridinecarboxylate (3.10 g, 11.3 mmol) and 10% Pd/C (1.00 g) in ethanol (100 mL) was hydrogenated at room temperature using the balloon method for 2 days. The reaction mixture was filtered through Celite and washed with ethanol. The combined ethanol extracts were concentrated in vacuo and the residue was chromatographed on silica (dichloromethane: methanol:isopropylamine 95:5:1) to give the desired product (2.63 g, 84%). 1H NMR (400 MHz, CDCl3) δ 7.10 (t, 1H, J=7.6 Hz), 6.62 (d, 1H, J=8.4 Hz), 6.60-6.59 (m, 2H), 4.27-4.18 (m, 2H), 3.62-3.58 (m, 2H), 2.80-2.72 (m, 2H), 2.62-2.59 (m, 1H), 1.89-1.52 (m, 4H), 1.49 (s, 9H); ESMS m/e: 277.2 (M+H)+.

Workup

  1. customwas hydrogenated at room temperature
  2. customfor 2 days
  3. filtrationThe reaction mixture was filtered through Celite
  4. washwashed with ethanol
  5. concentrationThe combined ethanol extracts were concentrated in vacuo
  6. customthe residue was chromatographed on silica (dichloromethane: methanol:isopropylamine 95:5:1)

Sources & evidence

ORD record
ord-744dd59a165247119353269aa4f3ff82
Source dataset
uspto-grants-2009_01
Patent number
US07473698B2

Reaction notes

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