Development of Modifiable Bidentate Amino Oxazoline Directing Group for Pd-Catalyzed Arylation of Secondary CH Bonds
作者:Kang Chen、Zhao-Wei Li、Peng-Xiang Shen、Hong-Wei Zhao、Zhang-Jie Shi
DOI:10.1002/chem.201406528
日期:2015.5.11
A novel bidentate α‐amino oxazolinyl directing group has been developed. Different from previous directing groups, this newly designed directing group was easily prepared from amino acids and modified in structure. This auxiliary preferentially effects functionalization at secondary C(sp3)H bonds, rather than at aryl C(sp2)H bonds. The diastereoselectivity of direct arylation between geminal secondary
一个新的双齿α-氨基恶唑啉基导向基团已经开发出来。与以前的指导小组不同,这个新设计的指导小组很容易从氨基酸制备并进行结构修饰。该辅助剂优先在二级C(sp 3)H键上而不是在芳基C(sp 2)H键上进行功能化。线性分子中的双键仲C(sp 3)H键之间直接芳基化的非对映选择性也首次通过远程手性中继与手性导向基团实现。通过改变底物和芳基卤化物的取代基,可以用相同的手性来源制得两种非对映异构体。