Results 31 to 40 of about 4,668 (189)

Earthworm is a versatile and sustainable biocatalyst for organic synthesis. [PDF]

PLoS ONE, 2014
A crude extract of earthworms was used as an eco-friendly, environmentally benign, and easily accessible biocatalyst for various organic synthesis including the asymmetric direct aldol and Mannich reactions, Henry and Biginelli reactions, direct three ...
Zhi Guan, Yan-Li Chen, Yi Yuan, Jian Song, Da-Cheng Yang, Yang Xue, Yan-Hong He   +6 more
doaj   +1 more source

Heteroatom Nucleophile Induced C–C Fragmentations to Access Functionalized Allenes

CHIMIA, 2012
The rich structural and reactivity profile of allenes render them versatile synthetic intermediates. However, application of allenes in organic chemistry is often attenuated by inconvenient methods of preparation.
Tanguy Saget, Nicolai Cramer
doaj   +1 more source

Domino Heck—Pericyclic Reactions

ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
von Zezschwitz, Paultheo, de Meijere, Armin   +1 more
openaire   +2 more sources

Asymmetric synthesis of chromene skeletons via organocatalytic domino reactions of in situ generated ortho-quinone methide with malononitrile and β-functionalized ketone

, 2017
Enantioselective organocatalytic domino reactions of in situ generated ortho-quinone methides with malononitrile and β-functionalized ketones have been developed.
Lili Zhang, Xiao Zhou, Pengfei Li, Zhantao Liu, Yang Liu, Yong Sun, Wenjun Li   +6 more
semanticscholar   +1 more source

When gold can do what iodine cannot do: A critical comparison

Beilstein Journal of Organic Chemistry, 2011
Gold catalysis has emerged as one of the most dynamic fields in organic synthesis. Only recently, more and more domino processes, for which gold pre-catalysts were found to be outstandingly effective, were paralleled by employing iodine electrophiles in ...
Sara Hummel, Stefan F. Kirsch
doaj   +1 more source

One-Pot Pyrrolidine-Catalyzed Synthesis of Benzopyrans, Benzothiopyranes, and Dihydroquinolidines

CHIMIA, 2007
A simple catalytic racemic synthesis of benzopyranes, benzothiopyranes and 1,2-dihydroquinolines is presented. The organocatalytic domino reactions between 2-heteroatom substituted aldehyde derivatives and ?,?-unsaturated aldehydes or ...
Ismail Ibrahem, Henrik Sundén, Ramon Rios, Gui-Ling Zhao, Armando Córdova   +4 more
doaj   +1 more source

New Access to Pyrano[2,3-c]pyrazole-3-carboxylates via Domino Four-Component Reaction and Their Antimicrobial Activity

Indonesian Journal of Chemistry, 2019
A library of some novel classes of pyrano[2,3-c]pyrazole-3-carboxylates was synthesized by employing uncatalyzed domino four-component reaction using diethyloxaloacetate, hydrazine hydrate, aldehydes and malononitrile in refluxing of ethanol-acetic acid ...
Muhammad Siddiq Maarop, Fatin Nur Ain Abdul Rashid, Mohd Fazli Mohammat, Zurina Shaameri, Saiful Azmi Johari, Mazurah Mohamed Isa, Anis Low Muhammad Low   +6 more
doaj   +1 more source

Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3-b]indolizines from Alkylpyridinium Salts and Enaminones

Molecules, 2020
Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and ...
Ekaterina A. Sokolova, Alexey A. Festa, Karthikeyan Subramani, Victor B. Rybakov, Alexey V. Varlamov, Leonid G. Voskressensky, Erik V. Van der Eycken   +6 more
doaj   +1 more source

Anion–π catalysis: bicyclic products with four contiguous stereogenic centers from otherwise elusive diastereospecific domino reactions on π-acidic surfaces

Chemical Science, 2017
Delocalized over aromatic planes, anion–π interactions emerge as best to stabilize long-distance charge displacements in domino reactions of highest sophistication.
Le‐Ping Liu, Yoann Cotelle, Juliane Klehr, N. Sakai, T. Ward, S. Matile   +5 more
semanticscholar   +1 more source

Oxidative Coupling Reactions with Gold

CHIMIA, 2009
Oxidative coupling reactions are a very powerful tool for the construction of e.g. biaryl compounds, especially because typically no functionalization of the coupling partners is necessary.
Hermann A. Wegner
doaj   +1 more source