(R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate → (R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate

HRID 451674Notes

Reaction equation

HRID 451674 reaction equation
[Cl:1][C:2]1[C:3]([F:29])=[C:4]([CH: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>CO>[Cl:1][C:2]1[C:3]([F:29])=[C:4]([CH: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]([CH3:19])([CH3:20])[CH3:21])=[O:16])[CH2:10]2)[CH:5]=[CH:6][CH:7]=1

Participants

3

Reactant 1

HCID 59382873(R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(2-ethoxy-2-oxoethoxy)methyl)piperidine-1-carboxylate

Product 1

HCID 59382915(R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(2-hydroxyethoxy)methyl)piperidine-1-carboxylateYield 89%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (R)-tert-butyl 3-((3-chloro-2-fluorophenyl)(2-ethoxy-2-oxoethoxy)-methyl)piperidine-1-carboxylate (4.368 g, 10.2 mmol) in MeOH (85 mL) was added NaBH (3.18 g, 81.5 mmol) in portions such that the temperature remained below 40° C. After addition, the mixture was stirred at rt for 2-3 h. TLC showed the starting 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)(2-hydroxyethoxy)methyl)piperidine-1-carboxylate (3.5 g, 89%). 1H NMR (400 MHz, CDCl3): 1.18 (m, 1H), 1.38-1.46 (s, 9H), 1.65 (m, 1H), 1.85 (m, 2H), 2.66 (m, 1H), 3.25 (m, 1H), 3.38 (m, 2H), 3.69 (m, 3H), 3.93 (m, 1H), 4.52 (m, 6H); MS (E/Z): 388 (M+1)

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-59d6f92452634e149cf6e2ca6fe97c6b
Source dataset
uspto-grants-2013_07
Patent number
US08487108B2

Reaction notes

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