نتایج جستجو برای: cyclocondensation

تعداد نتایج: 265  

Journal: :Chemical communications 2005
Alexei S Karpov Eugen Merkul Thomas Oeser Thomas J J Müller

A novel sequence of Sonogashira coupling and electrophilic addition to an ynone, with concomitant deprotection and cyclocondensation, opens a new one-pot synthesis of 3-halofurans; the method can be readily elaborated to a new sequential Sonogashira-addition-cyclocondensation-Suzuki reaction to furnish 2,3,5-trisubstituted furans in a one-pot fashion.

Journal: :Organic & biomolecular chemistry 2011
Mercedes Amat Carlos Arróniz Elies Molins Carmen Escolano Joan Bosch

The double cyclocondensation of symmetric pyridyl bis(oxoacids) 2b and 3b with (R)-phenylglycinol stereoselectively gave access to bis-phenylglycinol-derived oxazolopyrrolidine 9 and oxazolopiperidone 10, respectively. Application of the stereocontrolled cyclocondensation reaction to phenyl bis-γ-oxoacid 4b provided 11, which was converted to the corresponding enantiopure di(pyrrolidinyl)benzen...

Journal: :Organic & biomolecular chemistry 2015
Chun-Lin Zhang Dong-Ling Wang Kun-Quan Chen Song Ye

The N-heterocyclic carbene-catalyzed [3 + 3] cyclocondensation of bromoenals and hydrazones is developed to give the corresponding chiral 4,5-dihydropyridazones in good yields with excellent enantioselectivities.

2011
Asok K. Mallik Tapas K. Mandal Rammohan Pal Amarendra Patra

Iodine-catalyzed cyclocondensation of cinnamaldehyde and thiophenol yields rapidly trans-2-phenyl-4-thiophenoxy-3,4-dihydro-2H-1-benzothiopyran in excellent yield with very high diastereoselectivity.

Journal: :Arkivoc 2021

Cyclocondensation between 4,4`-bis(4-chlorobenzenesulfonyl)biphenyl and catechol, with subsequent chromatographic separation of the reaction products, led to isolation four novel ether-sulfone macrocycles (cyclic dimer, -trimer, -tetramer -pentamer). Similarly, cyclocondensation catechol a seven-ring diketone/disulfone monomer allowed two new aromatic ether-ketone-sulfone macrocycles, cyclic di...

Journal: :Chemical communications 2013
Paweł Skowronek Beata Warżajtis Urszula Rychlewska Jacek Gawroński

An exceptionally large size cuboctahedral imine cage is obtained from small size organic molecules in a thermodynamically driven [8+12] cyclocondensation. This is a demonstration of the role of entropy of symmetry as a driving force in reversible reactions.

Journal: :Chemical communications 2013
Mercedes Amat Carlos Ramos Maria Pérez Elies Molins Pedro Florindo Maria M M Santos Joan Bosch

Starting from (S)-tryptophanol, a formal synthesis of ent-rhynchophylline and ent-isorhynchophylline, involving stereoselective cyclocondensation, spirocyclization, and alkylation reactions, and the final adjustment of the oxidation level at the oxindole and piperidine moieties, is reported.

Journal: :Chemical communications 2007
Lars Ulrik Nordstrøm Robert Madsen

A green and atom-economical method has been developed for the synthesis of piperazines by cyclocondensation of diols and amines in aqueous media in the presence of a catalytic amount of [Cp*IrCl2]2.

Journal: :Chemical communications 2015
Zhong-Hua Gao Xiang-Yu Chen Han-Ming Zhang Song Ye

The N-heterocyclic carbene-catalyzed [3+3] cyclocondensation of bromoenals and aldimines was developed to give the corresponding dihydropyridinones in good yields with excellent enantioselectivities.

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