tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-vinyl)-phenyl]-3-hydroxy-piperidine-1-carboxylate → tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-ethyl)-phenyl]-3-hydroxy-piperidine-1-carboxylate

HRID 1858615Notes

Reaction equation

HRID 1858615 reaction equation
[CH2:1]([O:3][C:4]([CH:6]=[CH:7][C:8]1[CH:13]=[CH:12][C:11]([CH:14]2[CH2:19][CH2:18][N:17]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:16][CH:15]2[OH:27])=[CH:10][CH:9]=1)=[O:5])[CH3:2]>C(O)C.[Pd]>[CH2:1]([O:3][C:4]([CH2:6][CH2:7][C:8]1[CH:9]=[CH:10][C:11]([CH:14]2[CH2:19][CH2:18][N:17]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:16][CH:15]2[OH:27])=[CH:12][CH:13]=1)=[O:5])[CH3:2]

Participants

4

Reactant 1

HCID 86604399tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-vinyl)-phenyl]-3-hydroxy-piperidine-1-carboxylate

Product 1

HCID 86604400tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-ethyl)-phenyl]-3-hydroxy-piperidine-1-carboxylateYield 132.2%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Procedure

A solution of 2.0 g (5.35 mmol) of tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-vinyl)-phenyl]-3-hydroxy-piperidine-1-carboxylate in 100 ml of ethanol was treated with 200 mg of palladium/charcoal (Type E101R) and hydrogenated at room temperature for 1 hour. Subsequently, the catalyst was filtered off and rinsed with ethanol. The filtrate was evaporated under reduced pressure and the light grey residue (1.97 g) was combined with those from three analogous hydrogenation batches (total 3.08 g). For purification, the crude product was chromatographed on silica gel using a 2:1 mixture of hexane and ethyl acetate as the eluent and thereafter crystallized from ethyl acetate/hexane. There were obtained 2.67 g (87% of theory) of tert-butyl (3RS,4RS)-4-[4-(2-ethoxycarbonyl-ethyl)-phenyl]-3-hydroxy-piperidine-1-carboxylate as colourless crystals; MS: 378 (M+H)+.

Workup

  1. filtrationSubsequently, the catalyst was filtered off
  2. washrinsed with ethanol
  3. customThe filtrate was evaporated under reduced pressure
  4. customFor purification
  5. customthe crude product was chromatographed on silica gel using
  6. additiona 2:1 mixture of hexane and ethyl acetate as the eluent
  7. customcrystallized from ethyl acetate/hexane

Sources & evidence

ORD record
ord-9bff86634d614cdb94256c40f39ec93e
Source dataset
uspto-grants-2000_11
Patent number
US06150526

Reaction notes

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