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Sodium hydride → tert-butyl (R)-4-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethoxy)phenyl]piperazine-1-carboxylate

HRID 856225
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 856225
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:10][CH2:9]2)=[CH:4][CH:3]=1.[H-].[Na+].Cl[C:24]1[N:25]([CH2:32][C@:33]2([CH3:36])[CH2:35][O:34]2)[CH:26]=[C:27]([N+:29]([O-:31])=[O:30])[N:28]=1>CN(C=O)C>[CH3:35][C@@:33]1([CH2:36][O:1][C:2]2[CH:7]=[CH:6][C:5]([N:8]3[CH2:13][CH2:12][N:11]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[CH2:10][CH2:9]3)=[CH:4][CH:3]=2)[O:34][C:24]2=[N:28][C:27]([N+:29]([O-:31])=[O:30])=[CH:26][N:25]2[CH2:32]1
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

5

Edukt 3

HCID 24758Sodium hydrideHCID 10443353(R)-2-chloro-1-(2-methyloxiran-2-ylmethyl)-4-nitroimidazoleHCID 116877404-(4-Hydroxy-phenyl)-piperazine-1-carboxylic acid tert-butyl ester

Produkt 1

HCID 67274388tert-butyl (R)-4-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethoxy)phenyl]piperazine-1-carboxylateAusbeute 44,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228
Dimethylformamide
Lösungsmittel

Reaktionsbedingungen

Temperatur
70 °C

Versuchsvorschrift

Tert-butyl 4-(4-hydroxyphenyl)piperazine-1-carboxylate (13.5 g, 48.8 mmol) was dissolved in DMF (100 ml). To the solution, sodium hydride (2.15 g, 53.7 mmol) was added at room temperature, and the solution was stirred for 20 minutes at 70° C. To the solution, (R)-2-chloro-1-(2-methyloxiran-2-ylmethyl)-4-nitroimidazole prepared in Example 12 (10.6 g, 48.8 mmol) was added with cooling on ice-bath, and the solution was stirred for further 20 minutes at 80° C. To the reaction mixture, ice-water was added, and the solution was stirred vigorously. The precipitates were filtered off, washed with water and dissolved in methylene chloride. The solution was washed with a saturated saline solution, dried over magnesium sulfate and then filtered. The resulting filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methylene chloride/methanol=100/1) and then crystallized from methylene chloride-ethyl acetate to afford tert-butyl (R)-4-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethoxy)phenyl]piperazine-1-carboxylate (9.9 g, yield 44%) as a white powder.

Aufarbeitung

  1. temperaturewith cooling on ice-bath
  2. stirringthe solution was stirred for further 20 minutes at 80° C
  3. stirringthe solution was stirred vigorously
  4. filtrationThe precipitates were filtered off
  5. washwashed with water
  6. dissolutiondissolved in methylene chloride
  7. washThe solution was washed with a saturated saline solution
  8. dry with materialdried over magnesium sulfate
  9. filtrationfiltered
  10. concentrationThe resulting filtrate was concentrated under reduced pressure
  11. customThe residue was purified by silica gel column chromatography (methylene chloride/methanol=100/1)
  12. customcrystallized from methylene chloride-ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-64eeee5795b44bd984b28b3980a241bd
Quelldatensatz
uspto-grants-2007_08
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US07262212B2

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