4-Methylmorpholine → Methyl N-[(4-nitrophenoxy)carbonyl]-L-valinate

HRID 53921

Reaktionsgleichung

Reaktionsgleichung von HRID 53921
Cl[C:2]([O:4][C:5]1[CH:10]=[CH:9][C:8]([N+:11]([O-:13])=[O:12])=[CH:7][CH:6]=1)=[O:3].Cl.[CH3:15][O:16][C:17](=[O:23])[C@H:18]([CH:20]([CH3:22])[CH3:21])[NH2:19].CN1CCOCC1>C(Cl)Cl>[CH3:15][O:16][C:17](=[O:23])[C@H:18]([CH:20]([CH3:22])[CH3:21])[NH:19][C:2]([O:4][C:5]1[CH:10]=[CH:9][C:8]([N+:11]([O-:13])=[O:12])=[CH:7][CH:6]=1)=[O:3]

Komponenten

5

Edukt 3

HCID 79724-MethylmorpholineHCID 821294-Nitrophenyl chloroformateHCID 111190Methyl valinate hydrochloride

Produkt 1

HCID 15344176Methyl N-[(4-nitrophenoxy)carbonyl]-L-valinate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A solution of 66.1 g (0.328 mol) of 4-nitrophenyl chloroformate in 1.2 liters of CH2Cl2 was cooled to 0° C. and treated with L-valine methyl ester hydrochloride. The resulting mixture was treated slowly, with stirring, with 68.9 ml (0.626 mol) of 4-methylmorpholine. The resulting solution was allowed to slowly warm to ambient temperature and was stirred overnight. After washing with 3 portions of 10% aqueous NaHCO3, the solution was dried over Na2SO4 and concentrated in vacuo. The residue was purified by silica gel chromatography by eluting with chloroform to provide the desired compound. 1H NMR (DMSO-d6) δ 0.94 (d, J=7 Hz, 3 H), 0.95 (d, J=7 Hz, 3 H), 2.12 (octet, J=7 Hz, 1 H), 3.69 (s, 3 H), 4.01 (dd, J=8, 6 Hz, 1 H), 7.41 (dt, J=9, 3 Hz, 2 H), 8.27 (dt, J=9, 3 Hz, 2 H), 8.53 (d, J=8 Hz, 1 H). Mass spectrum: (M+NH4)+ =314.

Aufarbeitung

  1. additionThe resulting mixture was treated slowly
  2. washAfter washing with 3 portions of 10% aqueous NaHCO3
  3. dry with materialthe solution was dried over Na2SO4
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by silica gel chromatography
  6. washby eluting with chloroform

Quellen und Nachweise

ORD-Eintrag
ord-c1949434768f41819cbf72bb27d9c9dd
Quelldatensatz
uspto-grants-1997_04
Patentnummer
US05621109

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