Studies toward the Synthesis of Pinnatoxins: The B,C,D-Dispiroketal Fragment
作者:Chong-Dao Lu、Armen Zakarian
DOI:10.1021/ol071266e
日期:2007.8.1
A stereoselective synthesis of the tricyclic B,C,D-dispiroketal fragment of pinnatoxins is described. Both products of an efficient enzymatic resolution reaction are used to set the stereochemistry of C12 and C23, which have opposite configuration. The configuration of the ketal centers is established upon an optimized thermodynamically controlled spiroketalization.