Diterpenoids. IX. Chemical Conversion to Diterpene Alkaloid from Abietic Acid.

By confluence from l-abietic acid at the key intermediate (XXIV) for Nagata's total synthesis of dl-atisine (I), dl-veatchine (II) and dl-garryine (III), the first example of total synthesis of the natural diterpene alkaloid from the other natural diterpene, was accomplished.