Methanol → N-(2,3-Dimethylphenyl)-4,5-dihydro-1,3-oxazol-2-amine

HRID 725903

Reaktionsgleichung

Reaktionsgleichung von HRID 725903
Cl[CH2:2][CH2:3][N:4]=[C:5]=[O:6].[CH3:7][C:8]1[C:14]([CH3:15])=[CH:13][CH:12]=[CH:11][C:9]=1[NH2:10].ClCCNC(N)=O.CO>O1CCCC1.O>[CH3:7][C:8]1[C:14]([CH3:15])=[CH:13][CH:12]=[CH:11][C:9]=1[NH:10][C:5]1[O:6][CH2:2][CH2:3][N:4]=1

Komponenten

7

Edukt 4

HCID 887MethanolHCID 68932,3-DimethylanilineHCID 160352-Chloroethyl isocyanate2×HCID 240817N-(2-Chloroethyl)urea

Produkt 1

HCID 211584N-(2,3-Dimethylphenyl)-4,5-dihydro-1,3-oxazol-2-amineAusbeute 84 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

Chloroethylisocyanate (Compound 5, Aldrich, 346 mg, 3.3 mmol) was added to a stirred solution of 2,3-dimethylaniline (Aldrich, 400 mg, 3.3 mmol) in tetrahydrofuran (5 ml) at room temperature. After 30 minutes a white precipitate formed. The solid chloroethylurea was collected by vacuum filtration yield: 477 mg (64%): mp 145°-146° C. HNMR (300 MHz, CDCl3) σ 7.00 (m, 3H); 6.72 (br, 1H); 5.19 (br, 1H), 3.59 (m, 2H); 3.49 (m, 2H); 2.30 (s, 3H); 2.18 (s, 3H); Mass spectrum m/e 226.0872 (C1H15ClN2O requires 226.0872). The chlorethylurea (199 mg, 0.88 mmol) was suspended in H2O (4 ml) and CH3OH (4 ml) and heated to reflux for 1 hour. The reaction mixture was cooled to room temperature and concentrated in vacuo. The residue was dissolved in CH2Cl2 and washed with 1N NaOH (to pH 13). The organic layer was dried over Na2CO3 and concentrated in vacuo to yield 140 mg (84%) of the title compound as a white crystalline solid: mp 112°-113.5° C.; 1H NMR (300 MHz, CDCl3) σ 7.19 (m, 1H); 7.09 (m, 1H), 6.91 (m, 1H); 5.00 (br, s, 1H); 4.40 (t, 2H); 3.70 (t, 2H); 2.30 (s, 3H); 2.15 (s, 3H); Mass spectrum m/e 190.1104 (C11H14N2O requires 190.1106).

Aufarbeitung

  1. customAfter 30 minutes a white precipitate formed
  2. filtrationThe solid chloroethylurea was collected by vacuum filtration yield: 477 mg (64%)
  3. temperatureto reflux for 1 hour
  4. concentrationconcentrated in vacuo
  5. dissolutionThe residue was dissolved in CH2Cl2
  6. washwashed with 1N NaOH (to pH 13)
  7. dry with materialThe organic layer was dried over Na2CO3
  8. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-93a35211865e4367a1906b5e25b93cf3
Quelldatensatz
uspto-grants-1998_01
Patentnummer
US05708015

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