Effect of 9,10-Cyclic Acetal Stereochemistry on Feasible Operation of the α-Ketol Rearrangement in Highly Functionalized Paclitaxel (Taxol) Precursors
作者:Leo A. Paquette、John E. Hofferberth
DOI:10.1021/jo020627v
日期:2003.3.1
The convergent, stereocontrolled synthesis of enantiopure stereoisomeric 9,10-cyclic acetals, whose designed role was to serve as potential precursors to Taxol, is reported. These advanced intermediates are multiply functionalized and carry a bridgehead alpha-ketol array which was key to isomerization into the proper framework. In agreement with relative strain energy values obtained by MM3 calculations
Concise Means for Accessing an Advanced Precursor to 1-Deoxypaclitaxel
作者:Xin Guo、Leo A. Paquette
DOI:10.1021/jo048289g
日期:2005.1.1
A program directed toward a total synthesis of 1-deoxypaclitaxel is described. The most direct route consists of six steps from the previously described diketone 12 and proceeds in 18% overall yield. The transformations involved in reaching the target molecule 22 consist of stereoselective α-ketol generation, an EtAlCl2-catalyzed transannularhydrideshift, regioselective monomesylation, and a Wagner−Meerwein