Chiral phosphoric acid catalyzed oxidative kinetic resolution of cyclic secondary amine derivatives including tetrahydroquinolines by hydrogen transfer to imines
synthetically versatile tetrahydroquinoline molecules with I2 and HBpin is described. In the presence of iodine (20 mol%) as a catalyst, reduction of quinolines and other N-heteroarenes proceeded readily with hydroboranes as the reducing reagents. The broad functional-group tolerance, good yields and mild reaction conditions imply high practical utility.
I can do it! Accelerated by simple iodide ions, rhodium‐catalysed transferhydrogenation can be readily performed on quinolines, isoquinolines and quinoxalines, affording the tetrahydro products in high yields with low catalyst loading (see scheme).
A General and Highly Selective Cobalt-Catalyzed Hydrogenation of N-Heteroarenes under Mild Reaction Conditions
作者:Rosa Adam、Jose R. Cabrero-Antonino、Anke Spannenberg、Kathrin Junge、Ralf Jackstell、Matthias Beller
DOI:10.1002/anie.201612290
日期:2017.3.13
Herein, a general and efficientmethod for the homogeneous cobalt‐catalyzed hydrogenation of N‐heterocycles, under mild reaction conditions, is reported. Key to success is the use of the tetradentate ligand tris(2‐(diphenylphosphino)phenyl)phosphine). This non‐noble metal catalyst system allows the selectivehydrogenation of heteroarenes in the presence of a broad range of other sensitive reducible
Low‐Temperature Nickel‐Catalyzed C−N Cross‐Coupling via Kinetic Resolution Enabled by a Bulky and Flexible Chiral
<i>N</i>
‐Heterocyclic Carbene Ligand
作者:Zi‐Chao Wang、Pei‐Pei Xie、Youjun Xu、Xin Hong、Shi‐Liang Shi
DOI:10.1002/anie.202103803
日期:2021.7.12
The transition-metal-catalyzed C−N cross-coupling has revolutionized the construction of amines. Despite the innovations of multiple generations of ligands to modulate the reactivity of the metal center, ligands for the low-temperature enantioselective amination of arylhalides remain a coveted target of catalyst engineering. Designs that promote one elementary reaction often create bottlenecks at
Continuous Flow Synthesis of Quinolines via a Scalable Tandem Photoisomerization‐Cyclization Process
作者:Mara Di Filippo、Marcus Baumann
DOI:10.1002/ejoc.202000957
日期:2020.10.22
A continuous flow process exploiting a light‐driven method for generating a series of drug‐like quinolines is reported and applied to the synthesis of the alkaloid natural product galipinine.