The Novel Skeletal Rearrangement of Cyclopentanones into Hydroazulenones via a Radical Process and its Application to the Formal Synthesis of Damsinic Acid
rearrangement of cyclopentanones with pentynyl side chains into hydroazulene compounds via a radicalprocess was developed. The presence of a triethylsilyloxy group at the α-position of the cyclopentanone was found to increase the reactivity. Except for this, there was no limitation of the reaction. The reaction was also applied to synthetic studies of damsinic acid, which was isolated from Ambrosia ambrosioides