Sodium borohydride → (R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate

HRID 2266220Notes

Reaction equation

HRID 2266220 reaction equation
[Cl:1][C:2]1[C:3]([F:23])=[C:4]([CH:20]=[CH:21][CH:22]=1)[C:5]([C@@H:7]1[CH2:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:8]1)=[O:6].[BH4-].[Na+]>CO>[Cl:1][C:2]1[C:3]([F:23])=[C:4]([CH:5]([OH:6])[C@@H:7]2[CH2:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:17])([CH3:18])[CH3:19])=[O:14])[CH2:8]2)[CH:20]=[CH:21][CH:22]=1

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 59382847(R)-tert-butyl 3-(3-chloro-2-fluorobenzoyl)piperidine-1-carboxylate

Product 1

HCID 59383063(R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylateYield 56%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (R)-tert-butyl 3-(3-chloro-2-fluorobenzoyl)piperidine-1-carboxylate (7.75 g, 22.7 mmol) in MeOH (160 mL) was added NaBH4 (6.9 g, 182 mmol) in portions such that the temperature remained below 40° C. After addition, the mixture was stirred at rt for 3 h. TLC showed the start material had disappeared. The solvent was removed in vacuo and the residue was partitioned between water and EtOAc. The organic layer was washed with H2O and brine, dried over Na2SO4 and evaporated to give (R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(hydroxy)methyl)piperidine-1-carboxylate (4.35 g, 56%) which was used in the next step without purification. MS (E/Z): 344 (M+H+).

Workup

  1. customremained below 40° C
  2. additionAfter addition
  3. customThe solvent was removed in vacuo
  4. customthe residue was 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-b7f5839a52fc43f9999d2b16c7591e54
Source dataset
uspto-grants-2010_12
Patent number
US07858624B2

Reaction notes

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