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The combination of a high-yielding dienyllithium addition and a highly diastereoselective 1,2-reduction allows the preparation of the completely protected C 13 –C 23 fragment 3 of the potent cytotoxic agent tedanolide 1. A convergent approach was used, namely a late stage coupling of the dienyllithium 16 with the selectively protected aldehyde 5 followed by oxidation–reduction and...
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