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
Introduction of the (−)-Berkelic Acid Side Chain and Assignment of the C-22 Stereochemistry
作者:Xiaoxing Wu、Jingye Zhou、Barry B. Snider
DOI:10.1021/jo901221a
日期:2009.8.21
oxidized and deprotected to complete the synthesis of (−)-berkelicacid and (−)-22-epi-berkelic acid. This synthesis establishes the absolute stereochemistry and assigns the stereochemistry at C-22. A biosynthetic pathway is proposed that is consistent with the known absolute stereochemistry at the quaternary carbon of spiciferone A, spicifernin, and berkelic acid and provides a simple explanation for