Atroposelective Total Synthesis of the Fourfold
<i>ortho</i>
‐Substituted Naphthyltetrahydroisoquinoline Biaryl
<i>O</i>
,
<i>N</i>
‐Dimethylhamatine
作者:Eric D. Slack、Raina Seupel、Donald H. Aue、Gerhard Bringmann、Bruce H. Lipshutz
DOI:10.1002/chem.201903832
日期:2019.11.7
A stereoselective total synthesis of O,N-dimethylhamatine, an analogue of an axially chiral naphthylisoquinoline natural biaryl product from tropical Ancistrocladus lianas, is reported. The route features a late-stage atropo-diastereoselective biaryl bond formation. Generation of this especially challenging, sterically hindered tetra-ortho-substituted array was achieved by using Nolan's (IPr*NHC)PdCinCl
据报道,O,N-二甲基ham碱的立体选择性全合成,它是热带手按藤本植物的轴向手性萘基异喹啉天然联芳基产物的类似物。该路线的特点是后期的对苯二酚-非对映选择性联芳键形成。通过在温和的Negishi偶联条件下使用Nolan's(IPr * NHC)PdCinCl预催化剂,可以实现这种特别具有挑战性,空间受阻的四邻位取代阵列的生成。讨论了通过实验获得的选择性和根据DFT计算预测的关键联芳基偶联步骤的选择性,该选择性导致了所需的M-非对映异构体。