Palladium-Catalyzed Enantioselective Directed C(sp<sup>3</sup>)–H Functionalization Using C<sub>5</sub>-Substituted 8-Aminoquinoline Auxiliaries
作者:Yi Huang、Xiaoyan Lv、Hua-Rong Tong、Wenji He、Ziqian Bai、Hao Wang、Gang He、Gong Chen
DOI:10.1021/acs.orglett.3c03688
日期:2024.1.12
8-Aminoquinoline (AQ) has proven to be a highly effective bidentate directing group for palladium-catalyzed C–H functionalization reactions. However, enantiocontrol of AQ-directed C(sp3)–H functionalization reactions has been challenging. Herein, a new protocol is presented for the Pd-catalyzed enantioselective arylation of unactivated β C(sp3)–H bonds of alkyl carboxamides with aryl iodides using a C5-iodinated
8-氨基喹啉 (AQ) 已被证明是钯催化 C-H 官能化反应的高效双齿导向基团。然而,AQ 引导的 C(sp 3 )–H 官能化反应的对映体控制一直具有挑战性。在此,提出了一种新的方案,用于使用 C 5 -碘化 8-氨基喹啉 (IQ) 辅助剂与 BINOL 配体共轭,对烷基羧酰胺的未活化 β C(sp 3 )–H 键与芳基碘化物进行 Pd 催化对映选择性芳基化。此外,C 5 -芳基取代的8-氨基喹啉辅助剂可以促进3-芳基丙酰胺的苄基C(sp 3 )-H键与相应的溴化物试剂在相似条件下的对映选择性烯基化和炔基化。