P(Cl)(Cl)([Cl:3])=O.[C:6]([C:10]1[CH:11]=[CH:12][CH:13]=[C:14]2[C:19]=1[N:18]=[CH:17][NH:16][C:15]2=O)([CH3:9])([CH3:8])[CH3:7].N>C1(C)C=CC=CC=1.CN(C)C1C=CC=CC=1>[Cl:3][C:15]1[C:14]2[C:19](=[C:10]([C:6]([CH3:9])([CH3:8])[CH3:7])[CH:11]=[CH:12][CH:13]=2)[N:18]=[CH:17][N:16]=118.6 ml (200 mmol) of phosphoryl chloride are added dropwise at room temperature to a suspension of 10.2 g (50 mmol) of 8-tert-butyl-4(3H)-quinazolinone in 100 ml of toluene. After addition of 5 drops of N,N-dimethylaniline, the reaction mixture is heated under reflux for 5 h. After cooling, the reaction mixture is diluted with 300 ml of toluene, poured onto 1000 g of ice and rendered alkaline (pH about 9) by addition of conc. ammonia solution. The organic phase is separated off, washed once with 300 ml of sat. sodium chloride solution, dried over magnesium sulfat e, and the toluene is removed in vacuo. The residue is chromatographed on silica gel (n-heptane:ethyl acetate 3:1 v:v). Yield: 9.3 g (42 mmol), 84%. Purity: >95% according to 1H-NMR.
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