反应详情

Compound II was treated with commercially-available methyl vinyl ketone in the presence of phosphoric acid and arsenic acid to afford the intermediate 5,6-dimethoxy-4-methyl-8-nitroquinoline (III), a new compound, as a pure crystalline material in 30% yield. This successful reaction is novel in that the steric hindrance provided by the 2-methoxy group of 4-amino-5-nitroveratrole and by the methyl group of methyl vinyl ketone would be expected by those skilled in the art to prevent the ring-closure reaction to form III from occurring.