Synthesis of Chiral Aldehyde Catalysts by Pd‐Catalyzed Atroposelective C−H Naphthylation
作者:Gang Liao、Hao‐Ming Chen、Yu‐Nong Xia、Bing Li、Qi‐Jun Yao、Bing‐Feng Shi
DOI:10.1002/anie.201906700
日期:2019.8.12
Chiral aldehyde catalysis opens new avenues for the activation of simple amines. However, the lack of easy access to structurally diverse chiral aldehyde catalysts has hampered the development of this cutting‐edge field. Herein, we report a Pd‐catalyzed atroposelective C−H naphthylation with 7‐oxabenzonorbornadienes for the preparation of axially chiral biaryls with excellent enantioselectivities (up
手性醛催化为简单胺的活化开辟了新途径。但是,由于缺乏易于获得的结构多样的手性醛催化剂,阻碍了这一前沿领域的发展。在此,我们报道了Pd催化的7-氧杂苯并降冰片二烯对苯并萘甲酸萘酚化反应,制备了对映体选择性极好(高达> 99%ee的轴向手性联芳基) )。该反应具有可扩展性和鲁棒性,是通过三步CH功能化序列快速提供轴向手性醛催化剂的关键步骤。这些手性醛在甘氨酸衍生的酰胺和二肽的不对称活化中表现出比先前报道的有机催化剂更好的活性和对映选择性。此外,初步研究还公开了该醛催化剂可以有效地覆盖手性二肽底物的固有表面选择性,这表明这种新型醛催化剂具有很强的手性诱导能力。