Palladium-Catalyzed Enantioselective C(sp<sup>3</sup>)–H Arylation of 2-Propyl Azaaryls Enabled by an Amino Acid Ligand
作者:Hong-Liang Li、Deng-Feng Yang、Hua-Qing Jing、Jon C. Antilla、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.1c04215
日期:2022.2.18
A palladium(II)-catalyzed enantioselective arylation of unbiased secondary C(sp3)–H bonds was developed. The enantioselectivity was controlled by the combination of a pyridyl or isoquinolinyl directing group and an amino acid, N-Boc-2-pentyl proline. A variety of 2-propyl azaaryls and biaryl iodides were employed to provide arylated products in moderate to good yields (up to 82%) with high enantioselectivities
开发了钯 (II) 催化的无偏二级 C(sp 3 )-H 键的对映选择性芳基化。对映选择性由吡啶基或异喹啉基导向基团和氨基酸N -Boc-2-戊基脯氨酸的组合控制。使用各种 2-丙基氮杂芳基和联芳基碘化物以中等至良好的产率(高达 82%)和高对映选择性(高达 93:7 er)提供芳基化产物。该反应是氨基酸启用的对映选择性无环亚甲基 C(sp 3)–H 芳基化。此外,即使在克级反应中,反应也以高对映选择性进行,产物转化为 5,6,7,8-四氢异喹啉生物活性分子。动力学同位素效应 (KIE) 实验表明,C-H 活化是对映选择性 C(sp 3 )-H 芳基化的速率决定步骤。