The Cinchona Primary Amine-Catalyzed Asymmetric Epoxidation and Hydroperoxidation of α,β-Unsaturated Carbonyl Compounds with Hydrogen Peroxide
作者:Olga Lifchits、Manuel Mahlau、Corinna M. Reisinger、Anna Lee、Christophe Farès、Iakov Polyak、Gopinadhanpillai Gopakumar、Walter Thiel、Benjamin List
DOI:10.1021/ja402058v
日期:2013.5.1
Using cinchona alkaloid-derived primary amines as catalysts and aqueous hydrogenperoxide as the oxidant, we have developed highly enantioselective Weitz-Scheffer-type epoxidation and hydroperoxidation reactions of α,β-unsaturated carbonylcompounds (up to 99.5:0.5 er). In this article, we present our full studies on this family of reactions, employing acyclic enones, 5-15-membered cyclic enones, and
Palladium-Catalyzed Allyl Cross-Coupling Reactions with In Situ Generated Organoindium Reagents
作者:Kooyeon Lee、Hyunseok Kim、Juntae Mo、Phil Ho Lee
DOI:10.1002/asia.201000890
日期:2011.8.1
compounds may be effective nucleophilic coupling partners in palladium‐catalyzed cross‐coupling reactions. A variety of allyl halides, such as allyl iodide, allyl bromide, crotyl bromide, prenyl bromide, geranyl bromide, and 3‐bromocyclohexene afforded the allylic cross‐coupling products in good to excellent yields. Stereochemistry of the double bond is retained in the allylic cross‐coupling reactions
Stereoselective aziridination of cyclic allylic alcohols using chloramine-T
作者:Susannah C. Coote、Peter O'Brien、Adrian C. Whitwood
DOI:10.1039/b811137e
日期:——
TsNClNa and t-BuSO(2)NClNa, BusNClNa) has been explored. The stereoselectivity of these reactions was highly dependent on the structure of the allylic alcohol and the chloramine salt. Generally, mixtures of cis- and trans-hydroxy aziridines were obtained, in which the major diastereomer was the cis-hydroxy aziridine, whilst complete cis-diastereoselectivity was observed in the aziridination of 1,3-disubstituted
Visible Light Photocatalysis of 6π Heterocyclization
作者:Niels Münster、Nicholas A. Parker、Lucy van Dijk、Robert S. Paton、Martin D. Smith
DOI:10.1002/anie.201705333
日期:2017.8.1
Photo-mediated 6π cyclization is a valuable method for the formation of fused heterocyclic systems. Here we demonstrate that irradiation of cyclic 2-aryloxyketones with blue LED light in the presence of an IrIII complex leads to efficient and high yielding arylation across a panoply of substrates by energy transfer. 2-Arylthioketones and 2-arylaminoketones also cyclize effectively under these conditions
Monodentate Phosphorus Ligand-Enabled General Palladium-Catalyzed Allylic C–H Alkylation of Terminal Alkenes
作者:Lian-Feng Fan、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/acs.orglett.9b02325
日期:2019.9.6
enable the palladium-catalyzed allylic C-H alkylationreaction of terminal alkenes with a wide variety of carbon nucleophiles. Moreover, an asymmetricallylic C-H alkylation of terminal alkenes with pyrazol-5-ones has been established in the presence of chiral phosphoramidite ligand and chiral phosphoric acid as co-catalyst. Mechanisticstudies suggest that a ternary Pd(0) complex, coordinated with a