作者:Thierry Hartung、Rafael Machleid、Martin Simon、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.201915870
日期:2020.3.27
A highly enantioselective synthesis of 1,12-disubstituted [4]carbohelicenes is reported. The key step for the developed synthetic route is a Au-catalyzed intramolecular alkyne hydroarylation, which is achieved with good to excellent regio- and enantioselectivity by employing TADDOL-derived (TADDOL=α,α,α,α-tetraaryl-1,3-dioxolane-4,5-dimethanol) α-cationic phosphonites as ancillary ligands. Moreover
报道了1,12-二取代的[4]碳杂环丁烯的高度对映选择性的合成。开发合成路线的关键步骤是Au催化的分子内炔烃加氢芳基化反应,通过使用TADDOL衍生的(TADDOL =α,α,α,α-四芳基-1,3-二氧戊环4,5-二甲醇)α-阳离子亚膦酸酯作为辅助配体。此外,适当设计的底物使得组装不同取代模式的[4]螺旋烯成为可能,从而证明了该方法的综合实用性。新制备的结构的绝对立体化学是通过X射线晶体学测定的,并且还报道了其光物理性质的表征。