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Cyclization Reactions (cyclization + reaction)

Distribution by Scientific Domains
Chemistry91%
Polymers and Materials Science7%
Distribution within Chemistry
Organic Chemistry84%
General & Introductory Chemistry7%
5 Other Subdomains9%

Kinds of Cyclization Reactions

  • intramolecular cyclization reaction
    		•

    Selected Abstracts

    Domino Aza-Claisen/Mannich Cyclization Reaction from a Chiral ,-Alkoxy Enamine or Sequential Alkylation of an ,-Alkoxy Ester Enolate or Nitrile Anion, Followed by an Intramolecular Wittig Reaction: Two (3+2) Annulation Routes to Homochiral 4-Alkyl-4-hydroxy-2-cyclopentenone Synthesis

    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 14 2003
    Cyrille Kuhn
    Abstract A study on the enantioselective synthesis of 4-alkyl-4-hydroxyalkylidene-cyclopentenone prostaglandins is reported. Two (3+2) annulation processes allow the synthesis of homochiral 4-alkyl-4-hydroxy-2-cyclopentenones 4,5, 10,11, and 17. The first process involves a domino aza-Claisen/Mannich cyclization reaction, resulting from the alkylation of an ,-alkoxy-enamine, derived from chiral ,-alkoxy aldehydes 1, 9, or 16 with 3-iodo-2-(methoxymethoxy)prop-1-ene (3) as the acetonyl equivalent. The second process is based on the sequential alkylation of esters 21, 39, or nitrile 20 with acetonyl equivalents 3 or 25, followed by an intramolecular Wittig reaction. As an application, the synthesis of the naturally occurring alkylidene-cyclopentenone prostaglandin clavulone II from the spiro[cyclopentene-furan]one 5 and the formal total synthesis of (+/-)-untenone 19 has been carried out. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source]

    Silver-Catalyzed One-Pot Cyclization Reaction of Electron- Deficient Alkynes and 2-Yn-1-ols: An Efficient Domino Process to Polysubstituted Furans

    ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010
    Hua Cao
    Abstract Transition metal-catalyzed domino reactions have been used as powerful tools for the preparation of polysubstituted furans in a one-pot manner. In this paper, an efficient synthetic method was developed for the construction of tri- or tetrasubstituted furans from electron-deficient alkynes and 2-yn-1-ols by a silver-catalyzed domino reaction. It is especially noteworthy that a 2,3,5-trisubstituted 4-ynyl-furan was formally obtained in an extremely direct manner without tedious stepwise synthesis. In addition, regio-isomeric furans were observed when substituted aryl alkynyl ketones were employed. This methodology represents a highly efficient synthetic route to electron-deficient furans for which catalytic approaches are scarce. The reaction proceeds efficiently under mild conditions with commercially available catalysts and materials. [source]

    One-Pot Synthesis of Highly Substituted Allenylidene Derivatives via Palladium- or Nickel-Catalyzed Tandem Michael Addition,Cyclization Reaction

    ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1-2 2009
    Yun Shi
    Abstract A simple and tandem synthetic approach, which offers an efficient, direct route to highly substituted indenes, has been developed by palladium- or nickel-catalyzed cyclization of propargylic compounds and nitrogen nucleophiles. The reaction takes place under mild conditions, and a possible mechansim is proposed. [source]

    A Highly Reactive Dicationic Iridium(III) Catalyst for the Polarized Nazarov Cyclization Reaction,

    ANGEWANDTE CHEMIE, Issue 19 2010
    Tulaza Vaidya
    Als ungewöhnlich aktiver Katalysator für die Nazarov-Cyclisierung polarisierter Substrate präsentiert sich der elektrophile Komplex 1. Arylvinylketone, die mit etablierten Katalysatoren nur schlecht reagieren, können mit 1/AgSbF6 (1:1) unter milden Bedingungen glatt cyclisiert werden, wobei AgBr als Niederschlag ausfällt. [source]

    ChemInform Abstract: Application of the Modified Pictet,Spengler Cyclization Reaction for the Preparation of an Imidazopyrazine Ring: Synthesis of New Pyrido- and Pyrimido-imidazopyrazines.

    CHEMINFORM, Issue 51 2009
    Sunil Sharma
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Construction of a Bicyclic ,-Benzyloxy and ,-Hydroxy Amide Library Through a Multicomponent Cyclization Reaction.

    CHEMINFORM, Issue 50 2009
    Li Zhang
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Homodimeric Coupling,Cyclization Reaction of 2,3-Allenamides.

    CHEMINFORM, Issue 39 2009
    Guofei Chen
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Rhodium(I)-Catalyzed Cyclization Reaction of o-Alkynyl Phenols and Anilines.

    CHEMINFORM, Issue 30 2009
    3-Disubstituted Benzofurans, Domino Approach to , Indoles.
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Phosphazene Base Catalyzed Tandem Addition , Cyclization Reaction of o-Alkynylbenzaldehyde with Oxygen and Nitrogen Nucleophiles.

    CHEMINFORM, Issue 28 2009
    Chikashi Kanazawa
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Synthesis and Triethylamine-Catalyzed Cyclization Reaction of 4-Pentyne-1,3-dione System Having Various Substituents.

    CHEMINFORM, Issue 9 2009
    Hirofumi Kuroda
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Proline-Mediated Enantioselective Construction of Tetrahydropyridines via a Cascade Mannich-Type/Intramolecular Cyclization Reaction.

    CHEMINFORM, Issue 43 2008
    Rong-Gang Han
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Novel Synthesis of Substituted Pyrrolidines and Piperidines via Radical Addition,Ionic Cyclization Reaction of Oxime Ethers.

    CHEMINFORM, Issue 36 2008
    Okiko Miyata
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Highly Regioselective Synthesis of Indene Derivatives Including an Allene Functional Group via Pd/C-Catalyzed Cyclization Reaction in Air.

    CHEMINFORM, Issue 3 2008
    Hai-Peng Bi
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    Rhodium-Catalyzed Arylatice Cyclization Reaction of Diynes with Arylboronic Acids.

    CHEMINFORM, Issue 52 2007
    Tomoya Miura
    Abstract ChemInform 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. [source]

    Synthesis of Tetracene Sulfoxide and Tetracene Sulfone via a Cascade Cyclization Reaction.

    CHEMINFORM, Issue 40 2007
    Yi-Chun Lin
    Abstract ChemInform 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. [source]

    Novel Synthesis of 4-Arylsulfenyl-3-hydroxy-2-pyrone: One-Pot Substitution,Rearrangement,Cyclization Reaction of Acetonide-Protected 4,5-Dihydroxy-2-chloroglycide Ester by Sodium Arylthiolate.

    CHEMINFORM, Issue 23 2006
    Takuzo Komiyama
    Abstract ChemInform 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. [source]

    Quinone Methide Initiated Cyclization Reaction: Synthesis of 4-Aryl-1,2,3,4-tetrahydroisoquinolines.

    CHEMINFORM, Issue 3 2005
    B. China Raju
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]

    Convenient Indole Synthesis from 2-Iodoanilines and Terminal Alkynes by the Sequential Sonogashira Reaction and the Cyclization Reaction Promoted by Tetrabutylammonium Fluoride (TBAF).

    CHEMINFORM, Issue 11 2004
    Naoyuki Suzuki
    No abstract is available for this article. [source]

    ChemInform Abstract: Intramolecular TiCl4 -Mediated Cyclization Reaction of ,-Hydroxy Alkynyl Acetals.

    CHEMINFORM, Issue 19 2002
    Yong-Hyun Kim
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    Synthesis of Chiral 2-Phospha[3]ferrocenophanes and their Behaviour as Organocatalysts in [3+2],Cyclization Reactions

    ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2009
    Arnaud Voituriez
    Abstract Planar chiral 2-phospha[3]ferrocenophanes have been prepared via a stereoselective three-step synthesis. The key step is the lithiation of the 1,1,-disubstituted ferrocene 11 bearing (S)-2-(methoxymethyl)pyrrolidines as the chiral ortho -directing groups. The diastereoselectivity of these reactions has been mastered by an appropriate choice of the metallating agent, so as to afford a suitable access to C2 -symmetrical, tetrasubstituted ferrocenes. These compounds have been converted into the enantiomerically pure 2-phospha[3]-ferrocenophanes 16, via the corresponding acetates and their reactions with primary phosphines. Phosphines 16 have been used as nucleophilic catalysts in model cyclization reactions. Unlike 2-phospha[3]-ferrocenophanes with stereogenic ,-carbons, the planar chiral derivatives 16 proved to be suitable catalysts for these processes. Thus, for instance, phosphine 16c successfully promotes the enantioselective [3+2],annulations of allenes and enones into functionalized cyclopentenes (ees up to 96%). Among others, spirocyclic derivatives have been obtained in good yields and ees in the range 77,85%. The robustness of this catalyst has been demonstrated by recycling experiments. [source]

    Total Synthesis of Peloruside,A through Kinetic Lactonization and Relay Ring-Closing Metathesis Cyclization Reactions,

    ANGEWANDTE CHEMIE, Issue 35 2010
    Thomas
    Zentrale Elemente der hier vorgestellten konvergenten Totalsynthese von Pelorusid,A (1) sind eine diastereoselektive Lactonisierung, um das C5,C9-Valerolacton aus dem C2 -symmetrischen Keton 3 zu erhalten, sowie eine Staffel-Ringschlussmetathese mit dem Dehydrovalerolacton 2 als Produkt. Ein neues Isomer von 1, das Valerolacton Isopelorusid,A (iso-1), wurde identifiziert. MOM=Methoxymethyl. [source]

    ChemInform Abstract: Rhodium-Catalyzed Domino Conjugate Addition,Cyclization Reactions for the Synthesis of a Variety of N- and O-Heterocycles: Arylboroxines as Effective Carbon Nucleophiles.

    CHEMINFORM, Issue 40 2010
    Ja Ock Park
    No abstract is available for this article. [source]

    ChemInform Abstract: Rhodium-Catalyzed Chemo- and Stereoselective Arylative and Alkenylative Cyclization Reactions of Unsymmetric Diynes Containing a Terminal Alkyne Moiety with Organoboronic Acids.

    CHEMINFORM, Issue 38 2010
    Levent Artok
    Abstract A variety of 1,6-diynes containing a terminal alkyne, e.g. (I) or (IV), reacts with aryl- (II) or alkenylboronic acids (VI) with excellent chemo- and stereoselectivity in the presence of a Rh2(cod)2(O-Me)2 complex to give the 5-exo cyclization products, exclusively. [source]

    ChemInform Abstract: Photoinduced Electron Transfer-Initiated Selective Cyclization Reactions of (Z)-N-Benzoyl-,-dehydro(1-naphthyl)alaninamides into 4,5-Dihydrooxazole Derivatives.

    CHEMINFORM, Issue 36 2010
    Yuhki Sato
    Abstract The substituent and solvent effects on the title reaction are studied. [source]

    ChemInform Abstract: Cyclization Reactions of 1-Amino-5-trifluoromethyl-5-thienyl-1-azapenta-1,4-dien-3-ones under Superelectrophilic Conditions: Synthesis of Novel Benzothiophenols, Cyclopentenols and Dihydrodiazepinols.

    CHEMINFORM, Issue 28 2009
    Nugzar Ghavtadze
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Rhenium(VII) Catalysis of Prins Cyclization Reactions.

    CHEMINFORM, Issue 12 2009
    Kwanruthai Tadpetch
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: [3 + 3] Cyclization Reactions of ,-Nitroenamines and ,-Enaminonitriles with ,,,-Unsaturated Carboxylic Acid Chlorides.

    CHEMINFORM, Issue 47 2008
    Mihaly V. Pilipecz
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: [8 + 2] and [8 + 3] Cyclization Reactions of Alkenyl Carbenes and 8-Azaheptafulvenes: Direct Access to Tetrahydro-1-azaazulene and Cyclohepta[b]pyridinone Derivatives.

    CHEMINFORM, Issue 33 2008
    Jose Barluenga
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Butyltellurium Tribromide: A Suitable Electrophilic Source to Cyclization Reactions.

    CHEMINFORM, Issue 32 2008
    Diego Alves
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

    ChemInform Abstract: Synthesis of Novel Pyrimidine Fused 8-Membered Heterocycles via Iminium Ion Cyclization Reactions.

    CHEMINFORM, Issue 23 2008
    Xin Che
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]