Water → tert-Butyl (4-hydroxy-2-methylbutan-2-yl)carbamate

HRID 2249595

Reaktionsgleichung

Reaktionsgleichung von HRID 2249595
[CH3:1][C:2]1([CH3:14])[N:5]([C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7])[C:4](=[O:13])[CH2:3]1.[BH4-].[Na+].O.[NH4+].[Cl-]>CO>[C:9]([O:8][C:6](=[O:7])[NH:5][C:2]([CH3:14])([CH3:1])[CH2:3][CH2:4][OH:13])([CH3:12])([CH3:10])[CH3:11]

Komponenten

6

Edukt 4

HCID 962WaterHCID 25517Ammonium ChlorideHCID 4311764Sodium borohydrideHCID 10397866Tert-butyl 2,2-dimethyl-4-oxoazetidine-1-carboxylate

Produkt 1

HCID 15473340tert-Butyl (4-hydroxy-2-methylbutan-2-yl)carbamateAusbeute 80,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

4,4-Dimethyl-1-tert-butyloxycarbonyl-azetidine-2-one (32.5 g, synthesized according to Schoen et al., J. Med. Chem. 1994, 37 (7), 897) was dissolved in methanol (450 ml). The solution was cooled to 0° by means of an ice bath and treated with sodium borohydride (18.3 g, 6 portions over 45 minutes). The mixture was allowed to stir for 3 hours at 0°, warmed to room temperature and stirred for another 60 min. The reaction mixture was then poured into a mixture of ice, water and sat. NH4Cl solution and extracted with ether. The organic layer was separated, washed with brine, dried over Na2SO4 and evaporated. The residual oil was purified by flash chromatography (gradient of hexanes in ethyl acetate: 7/3 to 1/1). The fractions containing the product were combined, evaporated and dried in vacuo to leave a colorless oil (26.7 g).

Aufarbeitung

  1. temperatureThe solution was cooled to 0° by means of an ice bath
  2. stirringstirred for another 60 min
  3. extractionextracted with ether
  4. customThe organic layer was separated
  5. washwashed with brine
  6. dry with materialdried over Na2SO4
  7. customevaporated
  8. customThe residual oil was purified by flash chromatography (gradient of hexanes in ethyl acetate: 7/3 to 1/1)
  9. additionThe fractions containing the product
  10. customevaporated
  11. customdried in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-c44853381de24de9bd6c2849b282127a
Quelldatensatz
uspto-grants-2008_01
Patentnummer
US07314884B2

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