Sodium borohydride → (R)-tert-butyl 3-((R)-(3-chlorophenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate

HRID 451926Notes

Reaction equation

HRID 451926 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]([O:22][CH2:23][C:24](OCC)=[O:25])[C@@H:9]2[CH2:14][CH2:13][CH2:12][N:11]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:10]2)[CH:5]=[CH:6][CH:7]=1.[BH4-].[Na+]>CO>[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]([O:22][CH2:23][CH2:24][OH:25])[C@@H:9]2[CH2:14][CH2:13][CH2:12][N:11]([C:15]([O:17][C:18]([CH3:20])([CH3:21])[CH3:19])=[O:16])[CH2:10]2)[CH:5]=[CH:6][CH:7]=1

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 59598480(R)-tert-butyl 3-((R)-(3-chlorophenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate

Product 1

HCID 58017426(R)-tert-butyl 3-((R)-(3-chlorophenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylateYield 99.4%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (R)-tert-butyl 3-((R)-(3-chlorophenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate (14 g, 34 mmol) in MeOH (200 mL) was added NaBH4 (10.35 g, 272 mmol) in portions while the temperature was lower than 40° C. After addition, the mixture was stirred at rt for 2-3 hr. The solvent was removed in vacuo to provide a residue which was partitioned between water and EtOAc. The organic layer was washed with H2O and brine, dried over Na2SO4 and evaporated to give the crude (R)-tert-butyl 3-((R)-(3-chlorophenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate (12.50 g), which was used in the next step without purification.

Workup

  1. customwas lower than 40° C
  2. additionAfter addition
  3. customThe solvent was removed in vacuo
  4. customto provide a residue which
  5. customwas partitioned between water and EtOAc
  6. washThe organic layer was washed with H2O and brine
  7. dry with materialdried over Na2SO4
  8. customevaporated

Sources & evidence

ORD record
ord-80f81a1cf71c41209277e1e4f0dd1ad8
Source dataset
uspto-grants-2013_07
Patent number
US08487108B2

Reaction notes

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