Acetic Acid → N-Benzyloxycarbonyl-2-amino-2-[4-propoxybenzyl]-ethanol

HRID 1459109

Reaktionsgleichung

Reaktionsgleichung von HRID 1459109
C[O:2][C:3](=O)[C@H:4]([CH2:16][C:17]1[CH:22]=[CH:21][C:20]([O:23][CH2:24][CH2:25][CH3:26])=[CH:19][CH:18]=1)[NH:5][C:6]([O:8][CH2:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1)=[O:7].[BH4-].[Na+].CO.C(O)(=O)C>COC(C)(C)C.O1CCCC1.O>[CH2:9]([O:8][C:6]([NH:5][CH:4]([CH2:16][C:17]1[CH:22]=[CH:21][C:20]([O:23][CH2:24][CH2:25][CH3:26])=[CH:19][CH:18]=1)[CH2:3][OH:2])=[O:7])[C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=1

Komponenten

8

Edukt 4

HCID 176Acetic AcidHCID 887MethanolHCID 4311764Sodium borohydrideHCID 22940772N-benzyloxycarbonyl-3-[4-propoxyphenyl]-alanine-methyl ester

Produkt 1

HCID 67688130N-Benzyloxycarbonyl-2-amino-2-[4-propoxybenzyl]-ethanol

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 962WaterLösungsmittelHCID 8028TetrahydrofuranLösungsmittelHCID 15413tert-Butyl methyl etherLösungsmittel

Versuchsvorschrift

4.15 g (11.2 mmol) of N-benzyloxycarbonyl-3-[4-propoxyphenyl]-alanine-methyl ester is dissolved in 20 ml of tert-butyl methyl ether and mixed with 0.17 g (4.5 mmol) of sodium borohydride. At 0° C., 6 ml of methanol is added and it is stirred for three hours under argon at a temperature below 5° C. Then, 0.8 ml of acetic acid, dissolved in 3 ml of tetrahydrofuran, is added, mixed with 3 ml of water and stirred for ten minutes at room temperature. The organic phase is separated, washed with water and dried on sodium sulfate. The drying agent is suctioned off, the filtrate is concentrated by evaporation and the residue is chromatographed for purification on silica gel (eluent: ethyl acetate/hexane).

Aufarbeitung

  1. additionis added
  2. stirringstirred for ten minutes at room temperature
  3. customThe organic phase is separated
  4. washwashed with water
  5. customdried on sodium sulfate
  6. concentrationthe filtrate is concentrated by evaporation
  7. customthe residue is chromatographed for purification on silica gel (eluent: ethyl acetate/hexane)

Quellen und Nachweise

ORD-Eintrag
ord-ca274c22274d40b7a345efc0e30b3f31
Quelldatensatz
uspto-grants-1998_12
Patentnummer
US05853699

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