Author's Organization：Department of Chemistry, Faculty of Science, Osaka City University, Shionogi and Co., Department of Chemistry, Faculty of Science, Osaka City University, Shionogi and Co., Shionogi Research Laboratories, Shionogi and Co., Department of Chemistry, Faculty of Science, Osaka City University, Shionogi and Co.,
Synthesis of lansiolic acid is completed through the regioselective reduction of α, γ-onoceradienedione as a key step, and this unique regioselectivity is discussed based on the conformation analysis of 3-keto-4, 4, 10-trimethyldecalin system.
