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Ring Transformation (ring + transformation)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Novel Promising Benzoazacrown Ethers as a Result of Ring Transformation of Benzocrown Ethers: Synthesis, Structure, and Complexation with Ca2+

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 16 2003
Sergey P. Gromov
Abstract A series of promising benzoazacrown ethers with the nitrogen atom conjugated with the benzene ring were synthesized using a novel synthetic procedure based on stepwise transformation of the macroheterocycle. The structures and spectral properties of the resulting benzoazacrown ethers and their complexes with Ca2+ were studied by X-ray diffraction and 1H, 13C, and 15N NMR spectroscopy including the 2D NOESY technique. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source]

ChemInform Abstract: Synthesis of 2-[(Arylmethylene)amino]cyclopropanecarbonitriles via a Two-Step Ring Transformation of 2-(Cyanomethyl)aziridines.

CHEMINFORM, Issue 34 2009
Sven Mangelineckx
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]

Ring Transformation of 1,5-Diazabicyclo[3.1.0]hexanes under the Action of Arylketenes.

CHEMINFORM, Issue 52 2006
Alexander V. Shevtsov
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]

A Regioselective Synthesis of Aryl Substituted Arylacetates Through Ring Transformation by Ethyl Levulinate.

CHEMINFORM, Issue 45 2006
Ramendra Pratap
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 Ring Transformation of 6-Trifluoroacetylpyrrolo[1,2-a]pyrazinium Salts to Form Pyrrolo[1,2-a]pyrazinones.

CHEMINFORM, Issue 32 2006
V. I. Terenin
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 N-Protected ,-Aminocyclopropanedicarboxylates and Their Ring Transformation to N-Benzhydryl-3-alkoxycarbonyl-4,4-dialkylpyrrolidin-2-ones.

CHEMINFORM, Issue 47 2005
Sven Mangelinckx
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

A Novel Synthesis of 2,3-Dihydro-1H-thieno[3,4-b]pyrroles via Ring Transformation of Cyclic Sulfonium Ylides by Titanium(IV) Chloride,Triethylamine System.

CHEMINFORM, Issue 41 2005
Hiroshi Maruoka
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Stereoselective Alkenylation of a 1,3-Disubstituted Pyrazol-5-one Through Ring Transformation of 2H-Pyran-2-ones.

CHEMINFORM, Issue 37 2005
Diptesh Sil
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Ring Transformation of 7-Nitro-1-(4-nitrophenyl)-4,5-dihydro-1H-imidazo- and -[1,2,3]triazolo[4,5-c]pyridin-4-ones.

CHEMINFORM, Issue 9 2005
Yu. M. Yutilov
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

A Novel Ring Transformation of Nitropyrimidinone Leading to Polyfunctionalized Pyridones.

CHEMINFORM, Issue 18 2004
Nagatoshi Nishiwaki
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

An Efficient Controlled Synthesis of Bent-Core Oligoarenes and Heteroarenes Through Ring Transformation of 2H-Pyran-2-ones.

CHEMINFORM, Issue 29 2003
Diptesh Sil
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

A Novel Ring Transformation of Pyridinium Salts as a Route to 4-Arylpyridines.

CHEMINFORM, Issue 15 2003
Sergey P. Gromov
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Stereoselective Synthesis of Thiochroman-4-ones by Ring Transformation of Chiral 5-Ylidene-1,3-dioxan-4-ones with 2-Bromothiophenol via Bromo,Lithium Exchange.

CHEMINFORM, Issue 11 2002
Akbar Ali
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]

ChemInform Abstract: Fluorenyl-Participated Ring Transformation of Urazoles to Triazinanediones.

CHEMINFORM, Issue 41 2001
Yong Gong
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]

ChemInform Abstract: Stereoselective Synthesis of 3,4-Disubstituted Pyroglutamates by Ring Transformation of 5-Ylidene-1,3-dioxan-4-ones with N-(Diphenylmethylene)-glycinate.

CHEMINFORM, Issue 14 2001
Akbar Ali
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]

ChemInform Abstract: Synthesis of Optically Active Hydroxyalkylbenzothiazepinones by Ring Transformation of 2-Alkylidenelactones with o-Aminothiophenol.

CHEMINFORM, Issue 2 2001
Andreas Otto
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]

Ring Transformations of Heterocyclic Compounds.

CHEMINFORM, Issue 38 2002
Part 22.
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Ring transformations of heterocyclic compounds.

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2002

2,4,6-Triarylpyrylium perchlorates 1 react with methyleneindolines 3in situ generated from the corresponding methylindolium salts 2, which are spiro-fused with a cycloalkane, benzanellated cycloalkene or a heterocyclic system. These diastereoselective 2,5-[C4+C2] pyrylium ring transformations are carried out in the presence of triethylamine/acetic acid in boiling ethanol to give the dispiroindolines 4 with a trans configuration of the more bulky substituents at the cyclohexadiene ring. By the same type of transformation the dispiro compounds 7/10 with an additional fused benzene ring are obtained from the pyrylium salt 1a and 6/9, the benzo-fused analogues of 3. Spectroscopic data of the transformation products as well as their mode of formation are discussed. [source]

Ring transformations of heterocyclic compounds.

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2002

The synthesis of pyrido[1,2- a]indolium perchlorates 8,11 from 2,4,6-triarylpyrylium perchlorates 1 and 2-methyl-3H -indoles 6,9 in the presence of a basic condensing agent (anhydrous sodium acetate, piperidine acetate, triethylamine/acetic acid, triethylamine) in ethanol by a 2,4-[C3+C2N] pyrylium ring transformation is reported. Spectroscopic data of the transformation products and their mode of formation are discussed. [source]

An aminoisoflavone , salicyloylindole ring transformation

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 3 2004
Werner Löwe
A series of 2,-nitroisoflavones 8,10, 15, 22, 27 and 28 was prepared via the (2-nitro-phenyl)-acetic acids 1, 13, 19 and 25. In order to obtain the corresponding 2,-aminoisoflavones the reduction of 8,10, 15, 22, 27 and 28 was undertaken. Surprisingly, new 3-salicyloylindoles instead of the expected 2,-aminoisoflavones were the main reduction products. In the following paper the preparation of the 2,-nitroisoflavones 8,10, 15, 22, 27 and 28 as well as the reduction experiments obtaining the 2,-aminoisoflavones 33 and 35 and the 3-salicyloylindoles 29,32, 34 and 36 will be described. Furthermore, a possible mechanism responsible for the formation of the 3-salicyloylindoles from 2,-nitroisoflavones under reductive conditions will be discussed. [source]

Ring transformations of heterocyclic compounds.

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2002

The synthesis of pyrido[1,2- a]indolium perchlorates 8,11 from 2,4,6-triarylpyrylium perchlorates 1 and 2-methyl-3H -indoles 6,9 in the presence of a basic condensing agent (anhydrous sodium acetate, piperidine acetate, triethylamine/acetic acid, triethylamine) in ethanol by a 2,4-[C3+C2N] pyrylium ring transformation is reported. Spectroscopic data of the transformation products and their mode of formation are discussed. [source]

Ring transformations of heterocyclic compounds.

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 2 2002

2,4,6-Triarylpyrylium perchlorates 1 react with methyleneindolines 3in situ generated from the corresponding methylindolium salts 2, which are spiro-fused with a cycloalkane, benzanellated cycloalkene or a heterocyclic system. These diastereoselective 2,5-[C4+C2] pyrylium ring transformations are carried out in the presence of triethylamine/acetic acid in boiling ethanol to give the dispiroindolines 4 with a trans configuration of the more bulky substituents at the cyclohexadiene ring. By the same type of transformation the dispiro compounds 7/10 with an additional fused benzene ring are obtained from the pyrylium salt 1a and 6/9, the benzo-fused analogues of 3. Spectroscopic data of the transformation products as well as their mode of formation are discussed. [source]