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Dehydrative Cyclization (dehydrative + cyclization)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Asymmetric Dehydrative Cyclization of ,-Hydroxy Allyl Alcohols Catalyzed by Ruthenium Complexes,

ANGEWANDTE CHEMIE, Issue 47 2009
Shinji Tanaka Dr.
Neue axial-chirale Liganden und ihre Allylester wurden hergestellt. Die Kombination dieser Liganden mit [CpRu(CH3CN)3]PF6 ermöglicht eine hoch effiziente intramolekulare dehydratisierende Cyclisierung von ,-Hydroxyallylalkoholen zu ,-Alkenyl-substituierten cyclischen Ethern ohne Aktivierung der Allyleinheiten (siehe Schema; Cp=Cyclopentadienyl, Naph=Naphthyl, Py=Pyridin). In manchen Fällen wurden Enantiomerenverhältnisse über 99:1 erzielt. [source]

ChemInform Abstract: An Extremely Facile Synthesis of Furans, Pyrroles, and Thiophenes by the Dehydrative Cyclization of Propargyl Alcohols.

CHEMINFORM, Issue 11 2010
Aaron Aponick
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: Asymmetric Dehydrative Cyclization of ,-Hydroxy Allyl Alcohols Catalyzed by Ruthenium Complexes.

CHEMINFORM, Issue 10 2010
Shinji Tanaka
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]

Hexamethyldisilazane-iodine Induced Intramolecular Dehydrative Cyclization of Diamides: A General Access to Natural and Unnatural Quinazolinones.

CHEMINFORM, Issue 33 2007
Umesh A. Kshirsagar
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 Antipyrine Derivatives Derived from Dimedone

CHINESE JOURNAL OF CHEMISTRY, Issue 4 2007
E. S. H. Ei ashry
Abstract Coupling of dimedone with the diazonium salt of 4-aminoantipyrine afforded 2,3-dimethyl-4-[2-(5,5-dimethyl- 2,6-dioxocyclohex-2-ylidend)-hydrazino]-5-oxo-1-phenylpyrazoline (3). Reaction of 3 with excess phenylhydrazine gave the mixed trishydrazone derivative 4. Treatment of 3 with hydroxylamine produced the bisoxime 5 which upon dehydrative cyclization with acetic anhydride gave the corrsponding tetrahydrobenzo[d][1,2,3]triazole derivative 7. A one-pot synthesis of 7 was done by reacting 3 with hydroxylamine hydrochloride in pyridine, followed by heatment with acetic anhydride. [source]