作者:Xiaoxing Wu、Jingye Zhou、Barry B. Snider
DOI:10.1002/anie.200805488
日期:2009.2.2
AbstractAn extremophilic challenge: Stereospecific condensation of a fully functionalized ketal aldehyde and a 2,6‐dihydroxybenzoic acid is the key step in the synthesis of (−)‐berkelic acid confirming Fürstner's reassignment of the stereochemistry at C18 and C19, establishing the absolute stereochemistry, and tentatively assigning the stereochemistry at C22.magnified image