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Microwave-Assisted Regioselective Benzylation: An Access to Glycal Derivatives with a Free Hydroxyl Group at C4. Beijing University of Chemical Technology, China Posters & Accepted Abstracts: Med chem. “Ring Opening–Ring Closure” Strategy for the Synthesis of Aryl- β to access the full features of the site or access our. Chiral Substituted 3‐Formylfurans from Carbohydrates: An Expedient Route via N‐Bromosuccinimide (NBS)‐Mediated Electrophilic Cyclization. Learn more. Stereoselective Michael additions on α-aminoacrylates as the key step to an l-Oic analogue bearing a quaternary stereocenter - Organic & Biomolecular Chemistry (RSC Publishing) A novel, highly stereoselective route for pharmaceutically relevant octahydroindole-2-carboxylates bearing a quaternary stereocenter has been developed. N‐Heterocyclic Carbene Catalyzed Homoenolate‐Addition Reaction of Enals and Nitroalkenes: Asymmetric Synthesis of 5‐Carbon‐Synthon δ‐Nitroesters. Organocatalyzed highly stereoselective Michael addition of ketones to alkylidene malonates and nitroolefins using chiral primary-secondary diaminecatalysts based on bispidine† Jie Liu , ‡ a Zhigang Yang , ‡ a Xiaohua Liu , a Zhen Wang , a Yanling Liu , a Sha Bai , a Lili Lin a and Xiaoming Feng * a Michael‐type additions of various organocopper reagents to the novel carbohydrate‐derived 2‐(diethoxyphosphoryl)hex‐1‐en‐3‐uloses are described. Chiral, non‐racemic lithium enolates (E,F,G) of 1,3‐dioxolan‐4‐ones, methyl 1,3‐oxazolidin‐4‐carboxylates, methyl 1,3‐oxazolin‐4‐carboxylates, 1,3‐oxazolidin‐5‐ones, and 1,3‐imidazolidin‐4‐ones derived from (S)‐lactic acid (2a), (S)‐mandelic acid (2b), and (S)‐malic acid (2c), or from (S)‐alanine (10), (S)‐proline (11), (S)‐serine (12), and (S)‐threonine (13), are added to nitroolefins. . . Michael addition of indoles to β-nitrostyrenes catalyzed by HY zeolite under solvent-free conditions. The transformation is proposed to proceed via a transient nitrile enolate which is subsequently stereoselectively protonated by an intramolecular transfer of the proton from nitrogen to the nitronate α-carbon. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005). A Greener, Efficient Approach to Michael Addition of Barbituric Acid to Nitroalkene in Aqueous Diethylamine Medium. -1 Aryl Enones This site needs JavaScript to work properly., b Pd-Catalyzed allylic alkylation of secondary nitroalkanes. do not need to formally request permission to reproduce material contained in this contained in this article in third party publications C Efficient iron-catalyzed Michael addition of indole to nitroolefins under solvent-free conditions. or in a thesis or dissertation provided that the correct acknowledgement is given A Highly Efficient and Stereocontrolled Synthesis of 2‐Deoxy‐1,5‐thioanhydro‐L‐hexitols from D‐Glycals in a Tandem Nucleophilic Displacement Reaction. A Highly Efficient and Stereocontrolled Synthesis of 2‐Deoxy‐1,5‐thioanhydro‐L‐hexitols from D‐Glycals in a Tandem Nucleophilic Displacement Reaction. Find NCBI SARS-CoV-2 literature, sequence, and clinical content: Reproduced material should be attributed as follows: If the material has been adapted instead of reproduced from the original RSC publication Phase‐Transfer‐Catalyst‐Mediated Domino Reaction of γ‐Nitro Ketones with Chalcones: Approach to Functionalized Six‐Membered‐Ring Carbocycles. Number of times cited according to CrossRef: Development of Routes for the Stereoselective Preparation of β-Aryl- The reactions have proved to be rapid, clean and stereoselective, giving rise to the formation of 3‐oxo‐2‐phosphono‐α‐C‐glycosides or the corresponding enol acetates. 1‐Benzoyl‐2‐t‐butyl‐3,5‐dimethyl‐4‐imidazolidinone. Reaction's scale up even improves the yield. Please check your email for instructions on resetting your password. Asymmetric Electrophilic Substitutions at the α‐Position of γ‐ and δ‐Lactams. Considering that the 1,4-lactones obtained in this work offer a new molecular scaffold for organic synthesis, these new results provide a solid theoretical platform that can be used to speed up synthesis of other derivatives in a stereo- and regioselective way. Instructions for using Copyright Clearance Center page for details. -glycosides via - . α TEMPO-Catalyzed Oxidation of 3- Green Procedure for the Synthesis of β-Nitro Sulfides by Michael Addition of Thiols to Nitroolefins. the whole article in a third party publication with the exception of reproduction Angewandte Chemie International Edition in English. A novel, highly stereoselective route for pharmaceutically relevant octahydroindole-2-carboxylates bearing a quaternary stereocenter has been developed. (,)‐2‐‐Butyl‐5‐methyl‐1,3‐dioxolan‐4‐one. Please enable JavaScript trans Organocatalytic enantioselective aza-Henry reaction of ketimines derived from isatins: access to optically active 3-amino-2-oxindoles. Previous Article Next Article. TEMPO-Catalyzed Oxidation of 3- Jiaxi Xu and Jiandong Wang . Preparation of Enantiomerically Pure γ‐Aminobutyric and Succinic Acid Derivatives. Chiral Imidazolidinone (MacMillan's) Catalyst. Highly enantioselective Friedel–Crafts alkylation of indole with electron deficient trans-β-nitroalkenes using Zn(II)–oxazoline–imidazoline catalysts. Highly Stereoselective Additions of Tin Enolates to Nitroalkenes and Subsequent Conversion of the Nitro Group into a Nitrile. Highly Diastereoselective Michael Addition Reactions of Butane-2,3-diacetal Desymmetrized Glycolic Acid. Learn more. Experimental and Theoretical Studies Devoted to the Synthesis of 2,6-Dideoxy-4-functionalized-d- ribono-hexono-1,4-lactone Conversions of these nitroalkylated products furnish the α‐branched α‐hydroxysuccinic acids 28 and 29, the α‐hydroxy‐γ‐amino acid 25, the α,γ‐di‐amino acid 32, the substituted γ‐lactames 19–22, and the pyrrolidine 23. Highly Stereoselective Oxy-Michael Additions to β,γ-Unsaturated α-Keto Esters: Rapid Enantioselective Synthesis of 3-Hydroxybutenolides. C Stereoselective synthesis of hydrazinodihydrofurans via cascade Michael addition–substitution involving the reaction of curcumin and other β-dicarbonyls with α-hydrazinonitroalkenes K. Bera, N. Ayyagari, N. Satam and I. N. N. Namboothiri, Org. Die milden Reaktionsbedingungen sind ein Vorteil dieser Methode: Die Reaktion verläuft bei Raumtemperatur ohne Ausschluß von Feuchtigkeit … Stereoselective Michael‐Type Addition of Organocopper Reagents to Enones Derived from Glycals in the Synthesis of 2‐Phosphono‐α‐C‐glycosides.. If you are not the author of this article and you wish to reproduce material from Asymmetric Michael‐Additions. Teil der Dissertation von G. C., Nr. Solvent and catalyst free route to 3-indolyl glycoconjugates: synthesis of sugar tethered isoxazolines and isoxazoles from 3-indolyl nitroalkanes. is available on our Permission Requests page. Facile and Promising Method for Michael Addition of Indole and Pyrrole to Electron-Deficient 2 Synthesis of Dibromo Compounds Containing 2,6-Dioxabicyclo[3.1.1]heptane Similar to Core Moiety of Thromboxane A2. Comprehensive Enantioselective Organocatalysis. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, I have read and accept the Wiley Online Library Terms and Conditions of Use. Asymmetric Conjugate Addition of α,α-Disubstituted Aldehydes to Nitroalkenes Organocatalyzed by Chiral Monosalicylamides from trans-Cyclohexane-1,2-Diamines. How we drifted into peptide chemistry and where we have arrived at. Corresponding authors, a of the whole article in a thesis or dissertation. 10.1002/1099-0690(200112)2001:23<4463::AID-EJOC4463>3.0.CO;2-1. If you are the author of this article you still need to obtain permission to reproduce First, in all cases, the Michael addition is highly regio- and stereoselective affording single product 3 in good yields. Vergleiche unsere frühere Arbeit [1] über die Umsetzung von doppeltdeprotonierten, chiralen β‐Hydroxycarbonsäureestern mit Nitroolefinen und unsere Übersichten über Nitroaliphaten in der Synthese [2a] und über Reaktivitätsumpolung [2b]. The key chiral intermediates 3 have been prepared in good yields and enantiomeric excesses up to 98%. Recent Advances in the Chemical Synthesis of Enantioselective Michael addition of 2-hydroxy-1,4-naphthoquinones to nitroalkenes catalyzed by binaphthyl-derived organocatalysts. Michael‐type additions of various organocopper reagents to the novel carbohydrate‐derived 2‐(diethoxyphosphoryl)hex‐1‐en‐3‐uloses are described. Selective Amination Reactions of α-Nitro Aryl and Heteroaryl Enoates. This article is part of the themed collection: For reproduction of material from all other RSC journals and books: For reproduction of material from all other RSC journals. Get the latest public health information from CDC: Stereoselective intramolecular Michael addition reactions of pyrrole and their application to natural product syntheses A thesis submitted for the degree of Doctor of Philosophy at the Australian National University by Daniel Antony Speedie Beck Research School of Chemistry Canberra, Australia February 2006 . Enantioselective Conjugate Addition of Fluoromalonate to Nitroalkenes Catalyzed by Chiral Nickel Complexes. Nitroalkylation and nitroalkenylation reactions of γ-lactone enolates. Straightforward Approach to Iminoxazines and Azetidinimines via 1,4-Additions of Chelated Enolates toward Nitroalkenes.  |  Sugars containing α,β-unsaturated carbonyl systems: synthesis and their usefulness as scaffolds in carbohydrate chemistry. Highly enantioselective conjugate addition of fluoromalonates to nitroalkenes using bifunctional organocatalysts. Synthesis of Thiazoline–Oxazoline Ligands and Their Application in Asymmetric Catalysis. Please check your email for instructions on resetting your password. Stereoselective Alkylation of Chiral, Non‐racemic Enolates by Nitroolefins. A highly efficient synthesis of (R)‐ and (S)‐citramalic acid. C Stereoselective Michael addition of carbon-, nitrogen-, oxygen-, and sulfur-centered nucleophiles on enantiopure hydroxylated 6,7-dehydro-5-oxoindolizidine. If you do not receive an email within 10 minutes, your email address may not be registered, Asymmetric Michael‐Additions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005). Enantioselective decarboxylative Michael addition of β-ketoacids to nitroalkenes catalyzed by binaphthyl-derived organocatalysts. A broad substrate range has been tolerated under the reaction conditions. it in a third party non-RSC publication you must Go to our Get the latest research from NIH: Enantioselective Saponification with Pig Liver Esterase (PLE): (1S,2S,3R)‐3‐Hydroxy‐2‐nitrocyclohexyl Acetate. ChemInform Abstract: Asymmetric Michael‐Additions. and you may need to create a new Wiley Online Library account. Gold(III) Chloride Catalyzed Synthesis of Chiral Substituted 3‐Formyl Furans from Carbohydrates: Application in the Synthesis of 1,5‐Dicarbonyl Derivatives and Furo[3,2‐c]pyridine.

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