Development of Pseudo-<i>C</i><sub>2</sub>-symmetric Chiral Binaphthyl Monocarboxylic Acids for Enantioselective C(sp<sup>3</sup>)–H Functionalization Reactions under Rh(III) Catalysis
作者:Yoshimi Kato、Luqing Lin、Masahiro Kojima、Tatsuhiko Yoshino、Shigeki Matsunaga
DOI:10.1021/acscatal.1c00765
日期:2021.4.2
Enantioselective C(sp3)–H functionalization reactions using high-valent group 9 metal catalysts with cyclopentadienyl ligands have been achieved by the introduction of appropriate chiral carboxylic acids. However, the diversity of the chiral carboxylic acids, as well as that of the applicable substrate structures remains limited. Herein, we report pseudo-C2-symmetric tunable chiral carboxylic acids with a binaphthyl
通过引入适当的手性羧酸,已经实现了使用具有环戊二烯基配体的高价9族金属催化剂进行对映选择性C(sp 3)-H官能化反应。但是,手性羧酸的多样性以及适用的底物结构的多样性仍然受到限制。在本文中,我们报道了具有双萘基骨架的伪C 2对称可调手性羧酸及其在2-烷基吡啶和相关杂芳族底物的对映选择性C(sp 3)-H酰胺化反应中的应用。固定循环结构和伪C 2发达的手性羧酸的对称性将降低构象柔韧性和歧义性。最佳手性羧酸和空间受阻的铑催化剂(Cp * t Bu Rh III)的组合表现出高对映选择性(高达96:4 er)。