Cesium carbonate → Tert-butyl 4-(2-chlorophenylthio)piperidine-1-carboxylate

HRID 1093567

Reaktionsgleichung

[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[SH:8].C(=O)([O-])[O-].[Cs+].[Cs+].[C:15]([O:19][C:20]([N:22]1[CH2:27][CH2:26][CH:25](OS(C)(=O)=O)[CH2:24][CH2:23]1)=[O:21])([CH3:18])([CH3:17])[CH3:16]>CN(C=O)C.O>[C:15]([O:19][C:20]([N:22]1[CH2:27][CH2:26][CH:25]([S:8][C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=2[Cl:1])[CH2:24][CH2:23]1)=[O:21])([CH3:18])([CH3:16])[CH3:17]

Komponenten

Reaktionsbedingungen

Temperatur: 80 °C

Versuchsvorschrift

To a stirred solution of 2-chlorobenzenethiol (2.5 g, 0.017 mole) in DMF (20 mL) was added cesium carbonate (6.77 g, 0.0208 mole), followed by 4-methanesulfonyloxy-piperidine-1-carboxylic acid tert-butyl ester (4.8 g, 0.0173 mole). The reaction mixture was heated at 80° C. overnight. The mixture was then diluted with cold water and the product was extracted with ethyl acetate. The ethyl acetate layer was washed with brine solution, dried over sodium sulfate and concentrated under reduced pressure to afford 4.64 g (82%) of 4-(2-chloro-phenylsulfanyl)-piperidine-1-carboxylic acid tert-butyl ester. LCMS: 328.11 (M+1)+, 95.12%. A solution of 4-(2-chloro-phenylsulfanyl)-piperidine-1-carboxylic acid tert-butyl ester (4 g, 0.0122 mole) in dioxane.HCl (7 mL) was stirred at ambient temperature for 30 minutes. The reaction mixture was then concentrated under reduced pressure and the resulting residue was washed with hexane twice to afford 3.75 g (99%) of 4-(2-chloro-phenylsulfanyl)-piperidine hydrochloride. LCMS: 228.05 (M+1)+, 92.02%.

Aufarbeitung

extractionthe product was extracted with ethyl acetate
washThe ethyl acetate layer was washed with brine solution
dry with materialdried over sodium sulfate
concentrationconcentrated under reduced pressure

Quellen und Nachweise

ORD-Eintrag: ord-f89e262b7a0e46c1bd130734afcbfbbb
Quelldatensatz: uspto-grants-2012_03
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08129376B2

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