Methyl Acrylate → 4-QuinazolineAcetic Acid 8-Fluoro-1,2,3,4-Tetrahydro-3-[2-Methoxy-5-(TrifluoroMethyl)Phenyl]-2-Oxo-Methyl ester

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Reaction Conditions

Reaction Steps

N-(2-Bromo-6-fluorophenyl)-N′-[2-methoxy-5-(trifluoromethyl)phenyl]urea (300 g) is suspended in isobutyronitrile (1.2 l) under a nitrogen atmosphere, then triethylamine (210 ml), bis(acetonitrile)dichloropalladium (7.5 g), tris-(o-tolyl)phosphine (18.0 g) and methyl acrylate (210 ml) are added in this sequence. The resulting suspension is stirred under reflux (ca. 102° C.) for 16 h and then cooled to room temperature. Water (1.2 l) is added and the mixture is stirred at room temperature for 1 h, then filtered off with suction and washed with water/methanol (1:1, 300 ml) and acetonitrile (100 ml). The residue is dried overnight at 45° C. in the VDO using entraining nitrogen. A total of 208 g of methyl {8-fluoro-3-[2-methoxy-5-(trifluoromethyl)phenyl]-2-oxo-1,2,3,4-tetrahydroquinazolin-4-yl}acetate are obtained as a solid, corresponding to 68.5% of theory.

Provenance & Evidence