Parallel kinetic resolution of propargyl ketols: formal synthesis of (+)-bakkenolide A
作者:Keisuke Kato、Satoshi Motodate、Satoshi Takaishi、Taichi Kusakabe、Hiroyuki Akita
DOI:10.1016/j.tet.2008.02.101
日期:2008.5
asymmetric cyclization–carbonylation of propargyl ketols catalyzed by palladium(II) with chiral bisoxazoline (box) ligands. The 2S,3S enantiomer of (±)-6 was preferentially converted to 13 (45–49% yields, 37–46% ee), and the 2R,3R enantiomer of (±)-6 was preferentially converted to 14 (21–23% yields, 92–97% ee). As an application of this reaction, formal synthesis of (+)-bakkenolide A was achieved.
我们描述了一个有趣的平行动力学分辨率的新例子。钯(II)与手性双恶唑啉(盒)配体催化的炔丙基酮醇的不对称环化-羰基化。(±)-6的2 S,3 S对映体优先转化为13(45-49%收率,37-46%ee),(±)-6的2 R,3 R对映体优先转化为14(21–23%的收率,92–97%ee)。作为该反应的应用,实现了(+)-巴克诺利德A的形式合成。