Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
The title reaction of tetrahydroquinolines with ketimine in the presence of chiral phosphoric acid proceeded with efficient conversion and excellent enantioselectivities.
Unprecedented Halide Dependence on Catalytic Asymmetric Hydrogenation of 2-Aryl- and 2-Alkyl-Substituted Quinolinium Salts by Using Ir Complexes with Difluorphos and Halide Ligands
the key to achieving high catalytic activity and enantioselectivity on asymmetric hydrogenation of 2‐aryl‐ and 2‐alkyl‐substituted quinolinium salts. The reaction was catalyzed by a cationic dinuclear iridium(III) complex with difluorphos and chloride or bromide ligands and gave the corresponding 2‐substituted 1,2,3,4‐tetrahydroquinolines in high enantioselectivities (up to 95 % ee; see scheme, difluorphos=[(4
Asymmetric Reduction of Quinolines: A Competition between Enantioselective Transfer Hydrogenation and Racemic Borane Catalysis
作者:Bochao Gao、Zaiqi Han、Wei Meng、Xiangqing Feng、Haifeng Du
DOI:10.1021/acs.joc.2c02905
日期:2023.3.3
A chiral phosphoric acid catalyzed asymmetrictransferhydrogenation of quinolines with regenerable dihydrophenanthridine derived by a borane-catalyzed hydrogenation of phenanthridine under H2 has been successfully realized. Despite the competition of a racemic hydrogenation pathway, a variety of tetrahydroquinolines were furnished in high yields with up to 91% ee.
已成功实现了由硼烷催化氢化菲啶在H 2 下衍生的手性磷酸催化喹啉与可再生二氢菲啶的不对称转移氢化反应。尽管存在外消旋氢化途径的竞争,但仍以高达 91% ee 的高产率提供了多种四氢喹啉。