Nickel-Catalyzed Enantioselective Arylation of Pyridinium Ions: Harnessing an Iminium Ion Activation Mode
作者:Stephen T. Chau、J. Patrick Lutz、Kevin Wu、Abigail G. Doyle
DOI:10.1002/anie.201303994
日期:2013.8.26
A nickel for your thoughts …︁ An enantioselective nickel‐catalyzedcross‐coupling between N‐acylpyridinium salts and organozinc reagents is reported. The catalytic system, which is comprised of an air‐stable NiII source and a chiral phosphoramidite ligand, affords 2‐substituted‐2,3‐dihydro‐4‐pyridones with up to >99 % ee.
镍为您的想法...︁报告了N-酰基吡啶盐和有机锌试剂之间的对映选择性镍催化交叉偶联。该催化体系由空气稳定的 Ni II源和手性亚磷酰胺配体组成,可提供 2-取代-2,3-二氢-4-吡啶酮,其ee高达 >99% 。
<i>N</i>-Acyldihydropyridones as Synthetic Intermediates. A Stereoselective Synthesis of Acyclic Amino Alcohols Containing Multiple Chiral Centers
作者:W. Stephen McCall、Teresa Abad Grillo、Daniel L. Comins
DOI:10.1021/jo802029y
日期:2008.12.19
opened regio- and stereoselectively with cyanogenbromide. The ring-opened products contain useful cyanamide and benzylic bromide functional groups. The benzyl bromide can be cleanly reduced, or substituted with various nucleophiles via an S(N)2 process to add additional heteroatoms stereoselectively. This methodology is useful for the stereoselective synthesis of uniquely substituted alkylamine derivatives
Synthesis of 1,3-Amino Alcohol Derivatives via a Silicon-Mediated Ring-Opening of Substituted Piperidines
作者:W. Stephen McCall、Daniel L. Comins
DOI:10.1021/ol9010757
日期:2009.7.2
regioselectively with TBAF and cyanogen bromide. The ring-opened products contain synthetically useful cyanamide and terminal alkene functional groups. This method is useful for the stereoselective synthesis of alkylamine derivatives containing multiple chiral centers.
Photoredox-Catalyzed Giese Reactions: Decarboxylative Additions to Cyclic Vinylogous Amides and Esters
作者:Kevin Dykstra、Alexei Buevich、Qi Gao、Yu-Hong Lam、Jeffrey T. Kuethe
DOI:10.3390/molecules27020417
日期:——
An effective strategy has been developed for the photoredox-catalyzed decarboxylative addition of cyclic amino acids to both vinylogous amides and esters leading to uniquely substituted heterocycles. The additions take place exclusively trans to the substituent present on the dihydropyridone ring affording stereochemical control about the new carbon-carbon bond. These reactions are operationally simplistic
Diels−Alder Reactions of 5-Vinyl-1-acyl-2-aryl-2,3-dihydro-4-pyridones: Regio- and Stereoselective Synthesis of Octahydroquinolines
作者:Jeffrey T. Kuethe、Clinton A. Brooks、Daniel L. Comins
DOI:10.1021/ol027308a
日期:2003.2.1
[reaction: see text] Readily available 5-vinyldihydropyridones 2 undergo Diels-Alder cyclization with various dienophiles to afford novel octahdroquinolines. The process is highly stereoselective and provides heterocyclic products containing synthetically useful functionality.