Experiments Directed Towards the Synthesis of Anthracyclinones. XXIII. A Synthesis of Fridamycin E

Fridamycin E (1) has been synthesized in six steps from the anthrarufin mono(chloroallyl) ether (10). The synthesis was based on a titanium-mediated aldol-like addition of a (-)- menthyl acetate enolate to the ketone (9). Similar additions to the aldehydes (23) and (25) are reported.