Lawesson's reagent → 6-Methoxy-1-methyl-2-phenyl-1H-quinazolin-4-thione
Reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[N:9]([CH3:13])[C:8]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[N:7][C:6]2=O.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:30])=CC=1>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[N:9]([CH3:13])[C:8]([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[N:7][C:6]2=[S:30]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
1.20 g (4.51 mmol) 6-Methoxy-1-methyl-2-phenyl-1H-quinazolin-4-one and 1.82 g (4.50 mmol) Lawesson's reagent (C14H14O2P2S4, Fluka) were dissolved in 20 ml toluene. The reaction mixture was boiled for 3 h. After evaporation the residue was further purified by column chromatography with silica, eluent dichloromethane/acetone 95/5.