Acetic Anhydride → 3-(2-bromo-phenyl)-6-fluoro-2-[2-(2-methyl-thiazol-4-yl)-vinyl]-3H-quinazolin-4-one

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Reaction Steps

Anhydrous zinc chloride (0.150 g, 1.1 mmol) was fused with a nitrogen purge in a round bottom flask with an open flame. The reaction vessel was allowed to return to ambient temperature, at which time dioxane (5 mL) was then added. To this mixture was added 3-(2-bromo-phenyl)-6-fluoro-2-methyl-3H-quinazolin-4-one (0.182 g, 0.55 mmol), acetic anhydride (0.156 mL, 1.65 mmol), and 2-methylthiazole-4-carboxaldehyde (0.209 g, 1.65 mmol in 3 mL of dioxane). The reaction was refluxed 3 hours, and was then cooled to ambient temperature. Once the reaction had cooled to ambient temperature it was diluted with water. The resulting mixture was repeatedly extracted with chloroform. The combined chloroform layers were washed with water and brine, then dried over magnesium sulfate and then concentrated to yield a dark residue. This residue was triturated with ether, filtered and dried to afford 0.116 g (52% of 3-(2-bromo-phenyl)-6-fluoro-2-[2-(2-methyl-thiazol-4-yl)-vinyl]-3H-quinazolin-4-one as tan solid.

Provenance & Evidence