Total Synthesis and Evaluation of Phostriecin and Key Structural Analogues
作者:Christopher P. Burke、Mark R. Swingle、Richard E. Honkanen、Dale L. Boger
DOI:10.1021/jo1010203
日期:2010.11.19
Full details of the total synthesis of phostriecin (2), the assignment of its relative and absolute stereochemistry, and the resultant structural reassignment of the natural product previously represented as sultriecin (1), a phosphate versus sulfate monoester, are detailed Studies with authentic material confirmed that phostriecin, but not sultriecin, is an effective and selective inhibitor of protein phosphatase 2A (PP2A) defining a mechanism of action responsible for its antitumor activity The extension of the studies to the synthesis and evaluation of a series of key synthetic analogues is disclosed that highlights the importance of the natural product phosphate monoester (vs sulfate or free alcohol, both inactive and > 250-fold), the alpha,beta-unsaturated lactone (12-fold), and the hydrophobic Z,Z,E-triene tail (C12-C22, ca 200-fold) including the unique importance of its unsaturation (50-fold, and no longer PP2A selective)
Total Synthesis, Assignment of the Relative and Absolute Stereochemistry, and Structural Reassignment of Phostriecin (aka Sultriecin)
作者:Christopher P. Burke、Nadia Haq、Dale L. Boger
DOI:10.1021/ja9097252
日期:2010.2.24
A totalsynthesis of phostriecin (2), previously known as sultriecin (1), its structuralreassignment as a phosphate versus sulfate monoester, and the assignment of its relative and absolute stereochemistry are disclosed herein. Key elements of the work, which provided first the originally assigned sulfate monoester 1 and then the reassigned and renamed phosphate monoester 2, relied on diagnostic (1)H