Reaction of 3-Methyl-2-cyclopenten-1-one<i>N</i>,<i>N</i>-Dimethylhydrazone with α,β-Unsaturated Carbonyl Compounds. A Novel Synthesis of Bicyclic Compounds
3-Methyl-2-cyclopenten-1-one N,N-dimethylhydrazone reacted with methyl vinyl ketone or acrylic acid derivatives to give a new bicyclic bifunctional compound in good yield in a polar aprotic solvent such as dimethylformamide.