Concise Enantioselective Synthesis of 3,5-Dialkyl-Substituted Indolizidine Alkaloids via Sequential Cross-Metathesis−Double-Reductive Cyclization
作者:Stefan Randl、Siegfried Blechert
DOI:10.1021/jo0346095
日期:2003.11.1
5-dialkyl-substituted indolizidine alkaloids is reported. The convergent syntheses are based on a novel sequence of a cross-metathesis (CM) reaction of an alpha,beta-unsaturated ketone and a chiral homoallylic amine followed by a domino reaction involvinghydrogenation, N-deprotection, and two diastereoselectivereductive aminations. Our concept presents one of a few examples of a highly selective CM reaction in
Generation and Alkylation of α-Carbamyl Radicals via Organic Photoredox Catalysis
作者:Joshua B. McManus、Nicholas P. R. Onuska、David A. Nicewicz
DOI:10.1021/jacs.8b04890
日期:2018.7.25
Strategies for the direct C-H functionalization of amines are valuable as these compounds comprise a number of pharmaceuticals, agrochemicals and natural products. This work describes a novel method for the C-H functionalization of carbamate-protected secondary amines via α-carbamyl radicals generated using photoredox catalysis. The use of the highly oxidizing, organic acridinium photoredox catalyst
The Synthesis of 1,4-Diketones via a One-pot Five-component Connecting Reaction Based on Two Acylations of Organozincs Promoted by the Catalysis of a Pd(0) Species
作者:Motoki Yuguchi、Masao Tokuda、Kazuhiko Orito
DOI:10.1246/cl.2004.674
日期:2004.6
Unsymmetrical 1,4-diketones were produced via a one-pot five-component connecting reaction based on two kinds of Pd(0)-catalyzed acylations of organozincs using acryloyl chloride and TMSCl in an atmosphere of carbon monoxide.
l-Proline-derived ligands to mimic the ‘2-His-1-carboxylate’ triad of the non-haem iron oxidase active site
作者:Victoria J. Dungan、Shwo Mun Wong、Sarah M. Barry、Peter J. Rutledge
DOI:10.1016/j.tet.2012.02.031
日期:2012.4
coupling l-proline to 2,6-bis(bromomethyl)pyridine, 2-(bromomethyl)-6-((tert-butyldimethylsilyloxy)methyl)pyridine and picolinic acid, we have generated several new ligand architectures designed to complex with iron(II) and mimic the NHIO active site. The resulting iron complexes promote modest levels of alkene dihydroxylation and allylic oxidation using hydrogenperoxide as oxidant.
Highly Efficient Construction of Benzene Ring in Carbazoles by Palladium-Catalyzed <i>endo</i>-Mode Oxidative Cyclization of 3-(3‘-Alkenyl)indoles
作者:Aidi Kong、Xiuling Han、Xiyan Lu
DOI:10.1021/ol060039u
日期:2006.3.1
[reaction: see text] A highly efficient construction of the benzene ring in carbazoles by palladium-catalyzed endo-mode oxidative cyclization of 3-(3'-alkenyl)indoles was developed. The reaction utilizes benzoquinone as the stoichiometric oxidant and is conducted under mild conditions.