Product-selectivity control by the nature of the catalyst: Lewis acid-catalyzed selective formation of ring-fused tetrahydroquinolines and tetrahydroazepines via intramolecular redox reaction
The first example of a catalytic enantioselective intramolecular hydride shift/ring closure reaction is reported. This redox neutral reaction cascade allows for the efficient formation of ring-fused tetrahydroquinolines in high enantioselectivities.
Expedient Synthesis of 1,4‐Benzodiazepines via a Tandem Condensation/[1,5]‐Hydride Transfer/Cyclization Process
作者:Siyuan Liu、Tuan Zhao、Jingping Qu、Baomin Wang
DOI:10.1002/adsc.201800781
日期:2018.11.5
An expedient approach to 1,4‐benzodiazepines via a tandem condensation/[1,5]‐hydride shift/cyclization process has been developed. This transformation started from readily available o‐amino benzaldehyde and aminomalonate and was promoted by low‐cost FeCl3 with high step and atom economy.
Lewis Acid Catalyzed Formation of Tetrahydroquinolines via an Intramolecular Redox Process
作者:Sandip Murarka、Chen Zhang、Marlena D. Konieczynska、Daniel Seidel
DOI:10.1021/ol802519r
日期:2009.1.1
Polycyclic tetrahydroquinolines were prepared by an efficient Lewis acid catalyzed 1,5-hydride shift, ring closure sequence. Gadolinium triflate was Identified as a catalyst that Is superior to scandium triflate as well as other Lewis acids. An approach toward a catalytic enantioselective variant Is also described.
Facile Formation of Cyclic Aminals through a Brønsted Acid-Promoted Redox Process
作者:Chen Zhang、Sandip Murarka、Daniel Seidel
DOI:10.1021/jo802325x
日期:2009.1.2
Cyclic aminals were prepared through a Bronsted acid-promoted reaction. This redox neutral process involves iminium ion formation, 1.5 H-transfer, followed by ring closure.