نتایج جستجو برای: alkenes

تعداد نتایج: 5720  

Journal: :Angewandte Chemie 2014
Kiran Matcha Andrey P Antonchick

The development of multicomponent reactions for indole synthesis is demanding and has hardly been explored. The present study describes the development of a novel multicomponent, cascade approach for indole synthesis. Various substituted indole derivatives were obtained from simple reagents, such as unfunctionalized alkenes, diazonium salts, and sodium triflinate, by using an established straig...

Journal: :Organic & biomolecular chemistry 2013
Atsunori Morigaki Tomoo Tanaka Tomotsugu Miyabe Takashi Ishihara Tsutomu Konno

Treatment of β-fluoroalkylated-α,β-unsaturated ketones with 1.2 equiv. of various arylboronic acids in the presence of 5 mol% of [Rh(COD)(2)]BF(4) and 6 mol% of (S)-BINAP in toluene/H(2)O (v/v = 4/1) at the reflux temperature for 3 h gave the corresponding Michael adducts in high yields with over 90% enantioselectivity. Though other electron-deficient alkenes, such as vinylsulfone and vinylphos...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Jeffrey Wu Yi-Ming Wang Amela Drljevic Vivek Rauniyar Robert J Phipps F Dean Toste

We report a catalytic enantioselective electrophilic fluorination of alkenes to form tertiary and quaternary C(sp3)-F bonds and generate β-amino- and β-aryl-allylic fluorides. The reaction takes advantage of the ability of chiral phosphate anions to serve as solid-liquid phase transfer catalysts and hydrogen bond with directing groups on the substrate. A variety of heterocyclic, carbocyclic, an...

Journal: :Chemical communications 2005
Olivier Buisine Guillaume Berthon-Gelloz Jean-François Brière Sébastien Stérin Gérard Mignani Paul Branlard Bernard Tinant Jean-Paul Declercq István E Markó

A new class of benzimidazolylidene carbene-Pt(0) complexes was developed and used to efficiently catalyse the hydrosilylation of alkenes.

2017
Yu-Chi Chen Chien-Chi Wu Wei-Ting Liao Ling-Jun Liu

Abstract: A reusable PdCl2(NH3)2/cationic 2,2′-bipyridyl system was used to catalyze the double Mizoroki-Heck reaction of aryl iodides with electron-deficient alkenes in water in the absence of inert gas, giving β,β-diarylated carbonyl derivatives in good to excellent yields. The formation of unsymmetrical β,β-diarylated alkenes were also studied by coupling aryl iodides with the corresponding ...

Journal: :Chemical science 2017
Naoki Noto Takashi Koike Munetaka Akita

Regioselective amino-difluoromethylation of aromatic alkenes via C(sp3)-CF2H and C(sp3)-N bond formation with the C 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0...

2015
Kevin Lafaye Cyril Bosset Lionel Nicolas Amandine Guérinot Janine Cossy

Alkenes containing N-heteroaromatics are known to be poor partners in cross-metathesis reactions, probably due to catalyst deactivation caused by the presence of a nitrogen atom. However, some examples of ring-closing and cross-metathesis involving alkenes that incorporate N-heteroaromatics can be found in the literature. In addition, recent mechanistic studies have focused on the rationalizati...

2014
Kenta Arai Kevin Watts Thomas Wirth

Electrochemical microreactors, which have electrodes integrated into the flow path, can afford rapid and efficient electrochemical reactions without redox reagents due to the intrinsic properties of short diffusion distances. Taking advantage of electrochemical microreactors, Kolbe electrolysis of di-and trifluoroacetic acid in the presence of various electron-deficient alkenes was performed un...

2007
Justine R. A. Cottam Peter J. Steel

X-Ray crystal structures are reported for five silver(I) complexes of four monoterpenoid alkenes. Discrete mononuclear complexes of the chiral alkenes (1S)-(-)-α-pinene and (1S)(-)-β-pinene with silver perchlorate and silver hexafluorophosphate are described. The achiral diene γ-terpinene forms a discrete mononuclear adduct with silver hexafluorophosphate and a two-dimensional polymeric network...

Journal: :Journal of the American Chemical Society 2016
Kelly E Kim Jiaming Li Robert H Grubbs Brian M Stoltz

A new strategy for the functionalization of sterically hindered terminal olefins is reported. Alkenes bearing quaternary carbons at the allylic or homoallylic position are readily oxidized to the corresponding aldehydes by palladium/copper/nitrite catalysis. A broad range of functional groups including esters, nitriles, silyl ethers, vinylogous esters, ketones, lactones, and β-ketoesters are to...

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