Results 41 to 50 of about 8,448 (224)
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 +3 more
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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 +2 more
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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 +6 more
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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 +3 more
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, 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.
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Synthesis of α-D-GalpN3-(1-3)-D-GalpN3: α- and 3-O-selectivity using 3,4-diol acceptors
Beilstein Journal of Organic Chemistry, 2018 The motif α-D-GalpNAc-(1-3)-D-GalpNAc is very common in Nature and hence its synthesis highly relevant. The synthesis of its azido precursor has been studied and optimized in terms of steps, yields and selectivity. It has been found that glycosylation of
Emil Glibstrup +1 more
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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 +3 more
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Diastereoselective Mannich reactions of pseudo-C2-symmetric glutarimide with activated imines
Beilstein Journal of Organic Chemistry, 2017 As an extension of the boron enolate-based aldol reactions, the oxazolidinone-installed bisimide 1a from 3-(trifluoromethyl)glutaric acid was employed for Mannich reactions with tosylated imines 2 as electrophiles to successfully obtain the corresponding
Tatsuya Ishikawa +3 more
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Unified Synthesis of Unconventional α‐Polyhalogenated Amines Through Hydroaminoalkylation
Angewandte Chemie International Edition, EarlyView.A unified, redox‐neutral method that transforms alkenes and alkynes into α‐polyhalomethyl amines using stable hemiaminal reagents is reported. This approach enables access to CF3, CF2H, CF2Cl, and CFClH motifs, expanding halogenated amine space with broad substrate scope, functional group tolerance, and applicability to late‐stage modification of drug ...
Angela K. Hofmeister +9 more
wiley +1 more source
Beilstein Journal of Organic ChemistryA cascade inter–intramolecular double Michael strategy for the synthesis of highly functionalized cyclohexanones from curcumins and arylidenemalonates is reported. This strategy works in the presence of aqueous KOH using TBAB as a suitable phase transfer
Deepa Nair +3 more
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