Triphenyl Phosphate → (3S, 5R)-1-(2,4-dimethoxy-benzyl)-3,5-dimethyl-4-trifluoroacetyl-piperazin-2-one

HRID 1432905

Reaktionsgleichung

Reaktionsgleichung von HRID 1432905
[CH3:1][O:2][C:3]1[CH:25]=[C:24]([O:26][CH3:27])[CH:23]=[CH:22][C:4]=1[CH2:5][N:6]([CH2:18][C@@H:19](O)[CH3:20])[C:7](=[O:17])[C@@H:8]([NH:10][C:11](=[O:16])[C:12]([F:15])([F:14])[F:13])[CH3:9].C1(OP(OC2C=CC=CC=2)(OC2C=CC=CC=2)=O)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>O1CCCC1>[CH3:1][O:2][C:3]1[CH:25]=[C:24]([O:26][CH3:27])[CH:23]=[CH:22][C:4]=1[CH2:5][N:6]1[CH2:18][C@@H:19]([CH3:20])[N:10]([C:11](=[O:16])[C:12]([F:14])([F:13])[F:15])[C@@H:8]([CH3:9])[C:7]1=[O:17]

Komponenten

5

Edukt 3

HCID 8289Triphenyl PhosphateHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 86592544(2S, 2S)-N-(2,4-Dimethoxy-benzyl)-N-(2-hydroxypropyl)-2-(2,2,2-trifluoroacetylamino)-propionamide

Produkt 1

HCID 57171471(3S, 5R)-1-(2,4-dimethoxy-benzyl)-3,5-dimethyl-4-trifluoroacetyl-piperazin-2-oneAusbeute 43,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

(2S, 2S)-N-(2,4-Dimethoxy-benzyl)-N-(2-hydroxypropyl)-2-(2,2,2-trifluoroacetylamino)-propionamide (3.64 g, 9.29 mmol) is dissolved in 25 mL of tetrahydrofuran. Triphenylphosphate (3.65 g, 14.0 mmol) is added, and the resulting mixture is cooled to 0° C. before diethyl azodicarboxylate (2.2 mL, 14 mmol) is added slowly. The resulting mixture is left to stir overnight. The reaction mixture is condensed, and the residue is purified by column chromatography (SiO2, 25% ethyl acetate/hexane). The desired product, (3S, 5R)-1-(2,4-dimethoxy-benzyl)-3,5-dimethyl-4-trifluoroacetyl-piperazin-2-one (1.5 g, 43% yield), is isolated as a clear oil.

Aufarbeitung

  1. additionis added slowly
  2. waitThe resulting mixture is left
  3. customcondensed
  4. customthe residue is purified by column chromatography (SiO2, 25% ethyl acetate/hexane)

Quellen und Nachweise

ORD-Eintrag
ord-d0c248c53bfe4d62a63af17d0d0d2e4c
Quelldatensatz
uspto-grants-2009_11
Patentnummer
US07612075B2

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