Acetic Acid → (2S,3S)-1-tert-Butoxycarbonyl-3-(5-(1,1-difluoroethyl)-2-(trifluoromethoxy)benzyl)amino-2-phenylpiperidine

HRID 1634329Notes

Reaction equation

HRID 1634329 reaction equation
[NH2:1][CH:2]1[CH2:7][CH2:6][CH2:5][N:4]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH:3]1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.[F:21][C:22]([C:25]1[CH:26]=[CH:27][C:28]([O:33][C:34]([F:37])([F:36])[F:35])=[C:29]([CH:32]=1)[CH:30]=O)([F:24])[CH3:23].C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C.[OH-].[Na+]>C(Cl)Cl>[C:11]([O:10][C:8]([N:4]1[CH2:5][CH2:6][CH2:7][C@H:2]([NH:1][CH2:30][C:29]2[CH:32]=[C:25]([C:22]([F:24])([F:21])[CH3:23])[CH:26]=[CH:27][C:28]=2[O:33][C:34]([F:35])([F:37])[F:36])[C@@H:3]1[C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1)=[O:9])([CH3:14])([CH3:13])[CH3:12]

Participants

7

Reactant 5

HCID 176Acetic AcidHCID 14798Sodium HydroxideHCID 5049666Sodium triacetoxyborohydrideHCID 10214733Tert-butyl 3-amino-2-phenylpiperidine-1-carboxylateHCID 186776085-(1,1-Difluoroethyl)-2-(trifluoromethoxy)benzaldehyde

Product 1

HCID 70001814(2S,3S)-1-tert-Butoxycarbonyl-3-(5-(1,1-difluoroethyl)-2-(trifluoromethoxy)benzyl)amino-2-phenylpiperidineYield 156.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a stirred solution of Compound 12 (500 mg, 1.81 mmol) and Compound 25 (552 mg, 2.17 mmol) in dry CH2Cl2 (10 ml) was added sodium triacetoxyborohydride (1.15 g, 5.43 mmol) portionwise at room temperature. Then to this was added acetic acid (109 mg, 1.81 mmol) at same temperature. The reaction mixture was stirred at room temperature for 66 h. The reaction mixture was basified to pH10-11 with 10% NaOH aq. with ice-cooling. The organic layer was separated and the aqueous layer was extracted with CH2Cl2. The combined solution was washed with brine, dried (MgSO4), and concentrated in vacuo to give crude product (1.46g) as a pale yellow oil. This was employed for the next step without further purification.

Workup

  1. temperaturecooling
  2. customThe organic layer was separated
  3. extractionthe aqueous layer was extracted with CH2Cl2
  4. washThe combined solution was washed with brine
  5. dry with materialdried (MgSO4)
  6. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-3b0cb54ca43b4f278cda313bc317fe38
Source dataset
uspto-grants-2003_01
Patent number
US06506775B1

Reaction notes

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