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Cesium carbonate → (S)-tert-Butyl 3-Ethyl-4-(6-nitropyridin-3-yl)piperazine-1-carboxylate

HRID 592710
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 592710
Br[C:2]1[CH:3]=[CH:4][C:5]([N+:8]([O-:10])=[O:9])=[N:6][CH:7]=1.[CH2:11]([C@@H:13]1[NH:18][CH2:17][CH2:16][N:15]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:14]1)[CH3:12].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.C(=O)([O-])[O-].[Cs+].[Cs+]>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].O1CCOCC1>[CH2:11]([C@@H:13]1[N:18]([C:2]2[CH:7]=[N:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][CH:3]=2)[CH2:17][CH2:16][N:15]([C:19]([O:21][C:22]([CH3:23])([CH3:25])[CH3:24])=[O:20])[CH2:14]1)[CH3:12]
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

7

Edukt 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 8176205-Bromo-2-nitropyridineHCID 24820542tert-Butyl (3S)-3-ethylpiperazine-1-carboxylate

Produkt 1

HCID 86683738(S)-tert-Butyl 3-Ethyl-4-(6-nitropyridin-3-yl)piperazine-1-carboxylateAusbeute 22 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 9811564Bis(dibenzylideneacetone)palladiumKatalysatorHCID 312751,4-DioxaneLösungsmittel

Reaktionsbedingungen

Temperatur
100 °C

Versuchsvorschrift

A 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 1,4-dioxane (50 mL), 5-bromo-2-nitropyridine (2.02 g, 10 mmol), (S)-tert-butyl 3-ethylpiperazine-1-carboxylate (2.14 g, 10.0 mmol), Pd2(dba)3 (458 mg, 0.50 mmol), XantPhos (576 mg, 1.0 mmol), and cesium carbonate (6.52 g, 20 mmol). After three cycles of vacuum/argon flush, the mixture was heated at 100° C. overnight. After this time the reaction was cooled to room temperature. It was then filtered and the filtrate was evaporated under reduced pressure. The residue was purified by silica-gel column chromatography eluting with 3:1 petroleum ether/ethyl acetate to afford 161a (700 mg, 22%) as a yellow solid. MS: [M+H]+ 336

Aufarbeitung

  1. customA 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter three cycles of vacuum/argon flush
  3. temperatureAfter this time the reaction was cooled to room temperature
  4. filtrationIt was then filtered
  5. customthe filtrate was evaporated under reduced pressure
  6. customThe residue was purified by silica-gel column chromatography
  7. washeluting with 3:1 petroleum ether/ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-ff5be579295143bdb07b1e212f0eea40
Quelldatensatz
uspto-grants-2016_01
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US09238655B2

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