Abstract
Diastereoselective Synthesis of Anthracyclinone Precursors[4 + 2] Cycloaddition of various dienes such as 1‐acetoxy‐1,3‐butadienes 4a, b or 1‐phenylethyloxy‐1,3‐butadienes 4c–g with 1,4‐anthraquinones 3 affords tetracyclic precursors of anthracyclinone. Using the chiral substituted 1,3‐butadienes 4 cycloadducts with d.e. > 98% are obtained. The high stereoselectivity is explained by π stacking.
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