An efficient and versatile synthesis of cis-hexahydrobenzophenanthridines starting from readily available tetralins has been developed using an intramolecular Friedel–Crafts alkylation as a key step. The substrates were prepared via a highly stereocontrolled rhodium-catalyzed ring-opening reaction of meso-oxabicyclic alkenes and a hydrogenation sequence. Thus, a wide variety of complex tetracyclic
以分子内的Friedel-Crafts烷基化为关键步骤,已经开发出了从容易获得的四氢化
萘开始的高效,多功能的顺式-六氢苯并
菲的合成方法。将基板通过的高度立体控制
铑-催化的开环反应制得的内消旋-oxabicyclic烯烃和氢化序列。因此,已经分离出了具有高
水平的区域,非对映和对映选择性的多种复杂的四环化合物。