Taxanes, such as, e.g., taxinin Β 1 or taxol 2, are unu sual hydroxylated diterpenes which occur in plants of the family Taxaceae, to which the yew tree (Taxus baccata L.) belongs. The antileukemic and antitumoral activities of some taxanes and the problems encountered in the syn thesis of the unusual tricyclic carbon skeleton 3 have aroused increasing interest in recent years . According to ...