Asymmetric arylative dearomatization reactions of para ‐aminophenols are realized by a Pd‐catalyst consisting of a TADDOL (α,α,α',α'‐tetraaryl‐2,2‐disubstituted 1,3‐dioxolane‐4,5‐dimethanol)‐derived chiral phosphoramidite ligand. The tetracyclic products bearing the key skeleton of Erythrina alkaloids are afforded in reasonable yields (up to 73%) with good to excellent enantioselectivity (up to 97% ee).
对氨基苯酚的不对称芳基脱芳香化反应是通过由TADDOL(α,α,α',α'-四芳基-2,2-二取代的
1,3-二氧戊环-4,5-二
甲醇)组成的Pd催化剂实现的。衍生的手性亚
磷酰胺
配体。带有赤藓
生物碱关键骨架的四环产物以合理的收率(高达73%)和良好至优异的对映选择性(高达97%ee)提供。通过将此方法用作关键步骤,可以实现(–)-3-去甲氧基赤藓
丁酮的精确全合成。