Sodium borohydride → (R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate

HRID 451955Notes

Reaction equation

HRID 451955 reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH3:29])=[C:6]([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:7]=1.[BH4-].[Na+]>CO>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH3:29])=[C:6]([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:7]=1

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 58011572(R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate

Product 1

HCID 58011515(R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylateYield 97%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate (8 g, 18.8 mmol) in MeOH (300 mL) was added NaBH4 (5.6 g, 0.15 mol) in portions while the temperature was lower than 40° C. After addition, the mixture was stirred overnight. The solvent was removed in vacuo to the residue, which was partitioned between water and EtOAc. The organic layer was washed with H2O and brine, dried over Na2SO4 and evaporated to give crude (R)-tert-butyl 3-((R)-(5-chloro-2-methylphenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate (7 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 to the residue, which
  4. customwas partitioned between water and EtOAc
  5. washThe organic layer was washed with H2O and brine
  6. dry with materialdried over Na2SO4
  7. customevaporated

Sources & evidence

ORD record
ord-8051e45cb53b4989837b16e7b33e70a7
Source dataset
uspto-grants-2013_07
Patent number
US08487108B2

Reaction notes

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