Imidazole → HCID 86661577, compound

HRID 717073Notes

Reaction equation

HRID 717073 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([OH:14])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[Si:15](Cl)([C:28]([CH3:31])([CH3:30])[CH3:29])([C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.N1C=CN=C1>CN(C=O)C.[Cl-].[Na+].O>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([O:14][Si:15]([C:28]([CH3:31])([CH3:30])[CH3:29])([C:22]2[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=2)[C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

6

Reactant 3

HCID 795ImidazoleHCID 94078tert-ButyldiphenylchlorosilaneHCID 643502Tert-butyl 4-hydroxypiperidine-1-carboxylate

Product 1

HCID 86661577HCID 86661577, compoundYield 62.6%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 57417360Sodium chloride; waterSolvent

Procedure

To a stirred solution of 4-hydroxy-piperidine-1-carboxylic acid tert-butyl ester (400 mg, 1.98 mmol) in DMF (2 mL) was added TBDPS chloride (0.52 mL, 1.98 mmol) and imidazole (297 mg, 4.47 mmol) and the reaction stirred at RT for 16 h afterwhich time the reaction mixture was diluted with brine (10 mL), washed with CH2Cl2 (3×25 mL) and the organics combined and dried through a phase separation cartridge and concentrated in vacuo. The crude material was purified by silica gel column chromatography, eluting with EtOAc and increasing the polarity to 30% EtOAc/isohexane to obtain 4-(tert-butyl-diphenyl-silanyloxy)-piperidine-1-carboxylic acid tert-butyl ester as a colourless oil (545 mg, 62%).

Workup

  1. washwashed with CH2Cl2 (3×25 mL)
  2. customdried through a phase separation cartridge
  3. concentrationconcentrated in vacuo
  4. customThe crude material was purified by silica gel column chromatography
  5. washeluting with EtOAc
  6. temperatureincreasing the polarity to 30% EtOAc/isohexane

Sources & evidence

ORD record
ord-a8347d29895e43a2990bd0f0671c18fa
Source dataset
uspto-grants-2015_11
Patent number
US09193689B2

Reaction notes

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