[(2,4-Dinitrophenyl)thio]acetic acid → 6-amino-3,4-dihydro-2H-1,4-benzothiazin-3-one

HRID 423880

Reaktionsgleichung

Reaktionsgleichung von HRID 423880
[N+:1]([C:4]1[CH:9]=[C:8]([N+:10]([O-])=O)[CH:7]=[CH:6][C:5]=1[S:13][CH2:14][C:15]([OH:17])=O)([O-])=O.O.O.[Sn](Cl)Cl>C(O)C>[NH2:10][C:8]1[CH:7]=[CH:6][C:5]2[S:13][CH2:14][C:15](=[O:17])[NH:1][C:4]=2[CH:9]=1

Komponenten

4

Edukt 2

HCID 60055[(2,4-Dinitrophenyl)thio]acetic acidHCID 61436Stannous chloride dihydrate

Produkt 1

HCID 6869016-amino-3,4-dihydro-2H-1,4-benzothiazin-3-oneAusbeute 61,7 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 702EthanolLösungsmittel

Versuchsvorschrift

A solution of 2-(2,4-dinitrophenylthio)-acetic acid (2.3 g, 9 mmol) and tin (II) chloride dihydrate (22.6 g, 0.1 mol) in ethanol (30 mL) was refluxed overnight. After removal of the solvent under reduced pressure, the residual slurry was diluted with water (100 mL) and basified with 10% Na2CO3 solution to pH 8. The resulting suspension was extracted with ethyl acetate (3×100 mL). The ethyl acetate extract was washed with water and brine, dried over Na2SO4, and concentrated. The residue was washed with CH2Cl2 to yield 6-amino-2H-benzo[b][1,4]thiazin-3(4H)-one (DC-7) as a yellow powder (1 g, 52%). 1H NMR (DMSO-d6) δ 10.24 (s, 1 H), 6.88 (d, 1 H,J=6 Hz), 6.19-6.21 (m, 2H), 5.15 (s, 2 H), 3.28 (s, 2 H); ESI-MS 181.1 m/z (MH+).

Aufarbeitung

  1. customAfter removal of the solvent under reduced pressure
  2. additionthe residual slurry was diluted with water (100 mL)
  3. extractionThe resulting suspension was extracted with ethyl acetate (3×100 mL)
  4. extractionThe ethyl acetate extract
  5. washwas washed with water and brine
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated
  8. washThe residue was washed with CH2Cl2

Quellen und Nachweise

ORD-Eintrag
ord-393975bcbfab486ea045957c9a3b419b
Quelldatensatz
uspto-grants-2012_01
Patentnummer
US08101767B2

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