Synthesis of 3-(2-Hydroxyaryl)-1-methyl-2-pyrazolin-5-ones from 4-Hydroxycoumarins and their Conversion to 2-Methyl-1-benzopyrano[4,3-<i>c</i>]pyrazol-3(2<i>H</i>)-one Derivatives

Synthesis · 1985 · 16 citations · 0 references