Abstract
d-Kaurene (XXXVI) and d-phyllocladene (XXXVII) were synthesized from l-abietic acid (I) via intramolecular carbenoid reaction of diazoketones and subsequent cleavage of the resulting cyclopropyl ring with Li-liq. NH3. Methyl dehydroabietate (XVI) and dehydroabietane (V) introduced from I were used as the starting materials. The improved synthesis of V was also described.
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