Acetic Acid → tert-Butyl 4-hydroxy-[1,4'-bipiperidine]-1'-carboxylate

HRID 1060806

Reaktionsgleichung

Reaktionsgleichung von HRID 1060806
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11](=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[OH:15][CH:16]1[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>O1CCCC1>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([N:19]2[CH2:20][CH2:21][CH:16]([OH:15])[CH2:17][CH2:18]2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Komponenten

6

Edukt 4

HCID 176Acetic AcidHCID 79341Piperidin-4-olHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylateHCID 5049666Sodium triacetoxyborohydride

Produkt 1

HCID 9835508tert-Butyl 4-hydroxy-[1,4'-bipiperidine]-1'-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To 1-tert-butoxycarbonyl-4-piperidone (200 g, 1.01 mol) in tetrahydrofuran (THF) (1500 ml) was added 4-hydroxypiperidine (78.1 g, 0.77 mol). The resultant slurry was stirred for 30 minutes before cooling the reaction mixture with ice/water, acetic acid (47 ml) is then added (exotherm) which caused precipitation. The slurry was allowed to warm to room temperature before the addition of sodium triacetoxyborohydride (236 g, 1.12 mol) which was washed in with THF (500 ml). The resultant slurry was stirred overnight at room temperature. To the reaction mixture was added water (2000 ml) to give a solution. The solution was then extracted with diethyl ether (3×1800 ml). The aqueous phase was basified with 10% aq NaOH (950 ml) and extracted with dichloromethane (DCM) (3×1500 ml). The combined DCM layers are dried (MgSO4), filtered and the solvent removed to give the sub-titled compound as a yellow viscous oil, (177 g, 81%; MS: (M+H) 285).

Aufarbeitung

  1. additionis then added (exotherm) which
  2. customprecipitation
  3. washwas washed in with THF (500 ml)
  4. stirringThe resultant slurry was stirred overnight at room temperature
  5. additionTo the reaction mixture was added water (2000 ml)
  6. customto give a solution
  7. extractionThe solution was then extracted with diethyl ether (3×1800 ml)
  8. extractionextracted with dichloromethane (DCM) (3×1500 ml)
  9. dry with materialThe combined DCM layers are dried (MgSO4)
  10. filtrationfiltered
  11. customthe solvent removed

Quellen und Nachweise

ORD-Eintrag
ord-1aabaee4f8a14456bc000454b077cc4b
Quelldatensatz
uspto-grants-2003_02
Patentnummer
US06525070B2

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