Chlorotrimethylsilane → tert-Butyl 4-((trimethylsilyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate

HRID 2066499Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11](=[O:14])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Cl[Si:16]([CH3:19])([CH3:18])[CH3:17].C(N(CC)CC)C>CN(C=O)C.O>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH:10]=[C:11]([O:14][Si:16]([CH3:19])([CH3:18])[CH3:17])[CH2:12][CH2:13]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of 4-oxo-piperidine-1-carboxylic acid tert-butyl ester (2.5 g, 12.55 mmol) in anhydrous DMF (5 mL) were added chlorotrimethylsilane (1.95 mL, 15.37 mmol) and triethylamine (4.18 mL, 30.0 mmol). The resulting milky mixture was heated at 80° C. for 17 h, then cooled to RT. The reaction mixture was diluted with water and extracted with EtOAc. The organic layer was separated, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by column chromatography to give 4-trimethylsilanyloxy-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester as a pale yellow oil (1.86 g, 55%). To a solution of 4-trimethylsilanyloxy-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (1.86 g, 6.852 mmol) in acetonitrile (80 mL) was added Selectfluor™ (2.7 g, 7.622 mmol) and the mixture was stirred at RT for 2 h. The resulting solution was diluted with water and extracted with EtOAc. The organic layer was separated, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by column chromatography to give the title compound as a colourless oil (1.13 g, 76%).

Workup

temperaturecooled to RT
extractionextracted with EtOAc
customThe organic layer was separated
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo
customThe resultant residue was purified by column chromatography

Sources & evidence

ORD record: ord-dca23aa5f6aa4c1ba3cdf602d2b3d33c
Source dataset: uspto-grants-2012_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08293735B2

Reaction notes

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