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Sodium borohydride → 1-[2-(3,4-Methylenedioxyphenyl)-2-hydroxyethyl]-4-(2-oxo-3,4-dihydro-2H-1,3-benzoxazin-3-yl)-piperidine

HRID 2166888
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 2166888
[CH2:1]1[O:29][C:28]2[CH:27]=[CH:26][C:5]([C:6]([CH2:8][N:9]3[CH2:14][CH2:13][CH:12]([N:15]4[CH2:20][C:19]5[CH:21]=[CH:22][CH:23]=[CH:24][C:18]=5[O:17][C:16]4=[O:25])[CH2:11][CH2:10]3)=[O:7])=[CH:4][C:3]=2[O:2]1.[BH4-].[Na+]>CO>[CH2:1]1[O:29][C:28]2[CH:27]=[CH:26][C:5]([CH:6]([OH:7])[CH2:8][N:9]3[CH2:14][CH2:13][CH:12]([N:15]4[CH2:20][C:19]5[CH:21]=[CH:22][CH:23]=[CH:24][C:18]=5[O:17][C:16]4=[O:25])[CH2:11][CH2:10]3)=[CH:4][C:3]=2[O:2]1
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Komponenten

4

Edukt 2

HCID 4311764Sodium borohydride2×HCID 130521661-(3,4-Methylenedioxybenzoylmethyl)-4-(2-oxo-3,4-dihydro-2H-1,3-benzoxazin-3-yl)-piperidine

Produkt 1

HCID 130521681-[2-(3,4-Methylenedioxyphenyl)-2-hydroxyethyl]-4-(2-oxo-3,4-dihydro-2H-1,3-benzoxazin-3-yl)-piperidineAusbeute 82,6 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

In this example, 3.0 g of 1-(3,4-methylenedioxybenzoylmethyl)-4-(2-oxo-3,4-dihydro-2H-1,3-benzoxazin-3-yl)piperidine obtained in Example 2 is mixed with 150 ml of methanol. While the mixture is stirred at 0° to 10° C., 0.8 g of sodium borohydride is added thereto over a period of 3 hours. Then, the mixture is stirred overnight at room temperature. The mixture is further mixed with 0.4 g of sodium borohydride and stirred at room temperature for 3 hours. The white crystals deposited are separated by filtration, washed with methanol and water and dried to obtain 2.36 g of a crude product. In the meantime, the filtrate is concentrated under reduced pressure. The residue is mixed with water. The crystals deposited are separated by filtration, washed with water and dried to obtain 0.37 g of a crude product. The two crude products are combined and recrystallized from ethanol to obtain 2.49 g of the desired product.

Aufarbeitung

  1. stirringThen, the mixture is stirred overnight at room temperature
  2. stirringstirred at room temperature for 3 hours
  3. customThe white crystals deposited are separated by filtration
  4. washwashed with methanol and water
  5. customdried
  6. customto obtain 2.36 g of a crude product
  7. concentrationIn the meantime, the filtrate is concentrated under reduced pressure
  8. additionThe residue is mixed with water
  9. customThe crystals deposited are separated by filtration
  10. washwashed with water
  11. customdried
  12. customto obtain 0.37 g of a crude product
  13. customrecrystallized from ethanol

Quellen und Nachweise

ORD-Eintrag
ord-33f3b2e78d9c417f850457858cb0f647
Quelldatensatz
uspto-grants-1983_06
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US04390536

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