Lawesson's reagent → 5-(4,4-Dimethyl-2-thioxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-4-methylthiophene-2-carbonitrile

HRID 1258079

Reaktionsgleichung

Reaktionsgleichung von HRID 1258079
[CH3:1][C:2]1([CH3:21])[C:7]2[CH:8]=[C:9]([C:12]3[S:16][C:15]([C:17]#[N:18])=[CH:14][C:13]=3[CH3:19])[CH:10]=[CH:11][C:6]=2[NH:5][C:4](=O)[O:3]1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:31])=CC=1>C1(C)C=CC=CC=1>[CH3:1][C:2]1([CH3:21])[C:7]2[CH:8]=[C:9]([C:12]3[S:16][C:15]([C:17]#[N:18])=[CH:14][C:13]=3[CH3:19])[CH:10]=[CH:11][C:6]=2[NH:5][C:4](=[S:31])[O:3]1

Komponenten

4

Edukt 2

HCID 87949Lawesson's reagentHCID 98147685-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-4-methylthiophene-2-carbonitrile

Produkt 1

HCID 99729445-(4,4-Dimethyl-2-thioxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-4-methylthiophene-2-carbonitrileAusbeute 51,6 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Versuchsvorschrift

To a solution of 5-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)-4-methylthiophene-2-carbonitrile (5 g, 16.7 mmol) in anhydrous toluene was added, at room temperature under a blanket of nitrogen, Lawesson's reagent (6 g, 14.8 mmol). The reaction mixture was heated at reflux for 2 hrs, allowed to cool to room temperature, and solvent was removed in vacuo. The residue was purified by a silica gel column chromatography (THF:hexane/1:3) to yield the title compound as a yellowish solid (2.4 g, 46%): mp 211-212° C.; 1H-NMR (DMSO-d6) δ 12.3 (s, 1H), 7.88 (s, 1H), 7.46-7.52 (m, 2H), 7.16 (d, 1H, J=8.3 Hz), 2.30 (s, 3H), 1.68 (s, 6H); MS (ESI) m/z 313 [M−H]−; Anal. Calcd. For C16H14N2OS2; C, 61.12; H, 4.49; N, 8.91. Found: C, 60.91; H, 4.48; N, 8.66.

Aufarbeitung

  1. temperatureThe reaction mixture was heated
  2. temperatureat reflux for 2 hrs
  3. customsolvent was removed in vacuo
  4. customThe residue was purified by a silica gel column chromatography (THF:hexane/1:3)

Quellen und Nachweise

ORD-Eintrag
ord-c4cd4372873f442586a79bf194e9727f
Quelldatensatz
uspto-grants-2013_06
Patentnummer
US08466146B2

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