Methyl p-toluenesulfonate → Methyl 2-amino-6-nitrobenzoate

HRID 1905770

Reaktionsgleichung

Reaktionsgleichung von HRID 1905770
[NH2:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([N+:11]([O-:13])=[O:12])[C:3]=1[C:4]([OH:6])=[O:5].[C:14]1(C)C=CC(S(OC)(=O)=O)=CC=1.C(N(CC)CC)C>CN(C=O)C>[NH2:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([N+:11]([O-:13])=[O:12])[C:3]=1[C:4]([O:6][CH3:14])=[O:5]

Komponenten

5

Edukt 3

HCID 6645Methyl p-toluenesulfonateHCID 8471TriethylamineHCID 957952-Amino-6-nitro-benzoic acid

Produkt 1

HCID 596477Methyl 2-amino-6-nitrobenzoateAusbeute 59,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6228DimethylformamideLösungsmittel

Versuchsvorschrift

A mixture of 2-amino-6-nitrobenzoic acid (11.9 g, 65.3 mmol), methyl p-toluenesulfonate (15.1 g, 81.1 mmol) and triethylamine (6.60 g, 65.3 mmol) in DMF (170 ml) was stirred under N2 at 60° for 18 hours. After removing DMF at 60° and 0.2 mm pressure, the residue was dissolved in ETOAc and washed with a saturated solution of NaHCO3 followed by a saturated aqueous solution of NaCl. The EtOAc extract was dried (Na2SO4), filtered and concentrated under reduced pressure. Flash chromatography over silica gel and elution with 50% toluene-50% CHCl3 gave methyl 2-amino-6-nitrobenzoate (7.6 g, 59.4%), m.p. 105°-107°.

Aufarbeitung

  1. customAfter removing DMF at 60°
  2. dissolution0.2 mm pressure, the residue was dissolved in ETOAc
  3. washwashed with a saturated solution of NaHCO3
  4. extractionThe EtOAc extract
  5. dry with materialwas dried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated under reduced pressure
  8. washFlash chromatography over silica gel and elution with 50% toluene-50% CHCl3

Quellen und Nachweise

ORD-Eintrag
ord-c58b0cae364846e7812e6f98f7bce7fd
Quelldatensatz
uspto-grants-1987_03
Patentnummer
US04647588

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