Benzoyl chloride → 1-Piperazinecarboxylic acid, 4-benzoyl-, 1,1-diMethylethyl ester

HRID 1865851Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1865851
[C:1]([N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]1)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].[OH-].[Na+].[C:16](Cl)(=[O:23])[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>O1CCOCC1.O.[Cl-].[Na+].O>[C:16]([N:11]1[CH2:10][CH2:9][N:8]([C:1]([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2])[CH2:13][CH2:12]1)(=[O:23])[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1

Komponenten

7

Edukt 3

HCID 7412Benzoyl chlorideHCID 14798Sodium HydroxideHCID 143452tert-Butyl piperazine-1-carboxylate

Produkt 1

HCID 185197561-Piperazinecarboxylic acid, 4-benzoyl-, 1,1-diMethylethyl esterAusbeute 90 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 962WaterLösungsmittelHCID 312751,4-DioxaneLösungsmittel2×HCID 57417360Sodium chloride; waterLösungsmittel

Versuchsvorschrift

To a solution of N-Boc-piperazine (14) (1.00 g, 5.37 mmol) in dioxane (5 mL), a solution of NaOH (0.50 g, 12.9 mmol) in water (5 mL) followed by a solution of benzoyl chloride (0.75 mL, 6.44 mmol) in dioxane (2 mL) under vigorous stirring were added. The reaction mixture was stirred at ambient temperature for 4 hours, diluted with brine (20 mL), and extracted with ethyl acetate (2×25 mL). The organic extract was washed successively with brine (20 mL), saturated NaHCO3 (20 mL), saturated KH2PO4 (20 mL), and dried (Na2SO4). The solvents were evaporated to give the title compound (1.400 g, 90%) which was used in the next step of the synthesis without further purification. 1H NMR (CDCl3, HMDS), δ: 1.41 (s, 9H), 2.86 (t, J=5.0 Hz, 4H); 3.62 (t, J=5.0 Hz, 4H); 7.34 (s, 5H).

Aufarbeitung

  1. additionwere added
  2. stirringThe reaction mixture was stirred at ambient temperature for 4 hours
  3. extractionextracted with ethyl acetate (2×25 mL)
  4. extractionThe organic extract
  5. washwas washed successively with brine (20 mL), saturated NaHCO3 (20 mL), saturated KH2PO4 (20 mL)
  6. dry with materialdried (Na2SO4)
  7. customThe solvents were evaporated

Quellen und Nachweise

ORD-Eintrag
ord-d272340e34b3468e8e0e2cd5a310e95e
Quelldatensatz
uspto-grants-2009_12
Patentnummer
US07629343B2

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