Author's Organization：The Institute of Physical and Chemical Research (Rikagaku Kenkyusho) The Institute of Physical and Chemical Research (Rikagaku Kenkyusho) The Institute of Physical and Chemical Research (Rikagaku Kenkyusho) The Institute of Physical and Chemical Research (Rikagaku Kenkyusho)
A new synthetic method for cyclodecanone intermediates (33 and 38) which are useful for the synthesis of not only germacranolide but guaianolide-type sesquiterpenoids is described. Synthesis of dihydrocostunolide, a typical germacranolide, is also described.
