Results 51 to 60 of about 19,176 (260)

diastereoselectivity

, 2019
Citation: 'diastereoselectivity' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.D01684 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

Acylation of trans-2-substituted cyclohexanols: the impact of substituent variation on the pyridine-induced reversal of diastereoselectivity [PDF]

, 2015
Diastereoselectivity in chemical reactions can arise from differences in activation energies associated with the reactants, if the process is kinetically controlled.
Sven Hackbusch, Hackbusch, Sven, Franz, Andreas H., Andreas H. Franz   +3 more
core   +1 more source

An effective one-pot access to polynuclear dispiroheterocyclic structures comprising pyrrolidinyloxindole and imidazothiazolotriazine moieties via a 1,3-dipolar cycloaddition strategy

Beilstein Journal of Organic Chemistry, 2016
An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles ...
Alexei N. Izmest’ev, Galina A. Gazieva, Natalya V. Sigay, Sergei A. Serkov, Valentina A. Karnoukhova, Vadim V. Kachala, Alexander S. Shashkov, Igor E. Zanin, Angelina N. Kravchenko, Nina N. Makhova   +9 more
doaj   +1 more source

Diastereoselective Ugi reaction for the synthesis of unnatural amino esters

Orbital: The Electronic Journal of Chemistry, 2012
Multicomponent Reactions (MCR) are useful reactions to obtain complex products by the simple mixture of 3 or more reactants. The classic Ugi reaction (4-UCR) involves a mixture of an amine, aldehyde, isocyanide and a carboxylic acid, giving peptoides as ...
Rafael Oliveira Rocha, Milenna Milhomem Sena, Gecimar Oliveira Gomes, Carlos Kleber Z. Andrade, Márcio Weber Paixão   +4 more
doaj   +1 more source

Catalytic Diastereoselective Petasis Reactions [PDF]

Angewandte Chemie, 2011
Multicomponent Petasis reactions: the first diastereoselective Petasis reaction catalyzed by chiral biphenols that enables the synthesis of syn and anti β-amino alcohols in pure form has been developed. The reaction exploits a multicomponent approach that involves boronates, α-hydroxy aldehydes, and amines.
Giovanni, Muncipinto, Philip N, Moquist, Stuart L, Schreiber, Scott E, Schaus   +3 more
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Unexplored Nucleophilic Ring Opening of Aziridines

Molecules, 2010
The reactivity of dianions of carboxylic acids towards aziridines has been studied. Although, a similar reactivity to that of enolates from ketones, esters or amides has been observed, the method directly yields g-aminoacids in one step.
Ana María Costero, Salvador Gil, Margarita Parra, Pablo Rodríguez   +3 more
doaj  

Diastereoselective anodic hetero- and homo-coupling of menthol-, 8-methylmenthol- and 8-phenylmenthol-2-alkylmalonates

Beilstein Journal of Organic Chemistry, 2017
Diastereoselective radical coupling was achieved with chiral auxiliaries. The radicals were generated by anodic decarboxylation of five malonic acid derivatives. These were prepared from benzyl malonates and four menthol auxiliaries.
Matthias C. Letzel, Hans J. Schäfer, Roland Fröhlich   +2 more
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Diastereoselective [2+2] Photocycloaddition of Chiral Cyclic Enones with Olefins in Aqueous Media Using Surfactants

Molecules, 2013
We conducted diastereodifferentiating [2+2] photocycloadditions of cyclo-hexenones modified with a chiral 8-(p-methoxy phenyl)menthyl auxiliary with olefins in water.
Yasuhiro Nishiyama, Mikiko Shibata, Takuya Ishii, Tsumoru Morimoto, Hiroki Tanimoto, Ken Tsutsumi, Kiyomi Kakiuchi   +6 more
doaj   +1 more source

Decoration of A-Ring of a Lupane-Type Triterpenoid with Different Oxygen and Nitrogen Heterocycles

Molecules, 2022
Betulinic acid (BA) was used as starting building block to create a library of novel BA-derived compounds containing O- and N-heterocycles. Firstly, BA was converted into methyl betulonate (BoOMe), which was used as intermediate in the developed ...
Joana L. C. Sousa, Hélio M. T. Albuquerque, Armando J. D. Silvestre, Artur M. S. Silva   +3 more
doaj   +1 more source

Diastereoselectivity of Azido-Ugi Reaction with Secondary Amines. Stereoselective Synthesis of Tetrazole Derivatives

, 2020
The diastereoselectivity of azido-Ugi reaction with cyclic amines was investigated. It was found that the reaction with α-substituted five- to seven-membered cyclic amines proceeds very efficiently to provide high control of diastereoselectivity (≤100 ...
Khrustalev V.N., Nenajdenko V.G., Zarezin D.P.   +2 more
core   +2 more sources