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Browsing by Subject "Gamma-butyrolactones"

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A Cascade reaction actuated by Nucleophilic heterocyclic carbene catalyzed intramolecular addition of enals via homoenolate to r,β-unsaturated esters: Efficient synthesis of coumarin derivatives.

Sinu, C R; Padmaja, D V M; Ranjini, U P; Seetha Lakshmi, K C; Suresh, E; Vijay Nair, G (American Chemical Society, 2013)

A nucleophilic heterocyclic carbene mediated intramolecular homoenolate reaction strategy for the efficient synthesis of 4-alkyl substituted coumarins is described.
Employing homoenolates generated by NHC catalysis in carbon-carbon bond-forming reactions: state of the art

Vijay Nair, G; Rajeev S Menon; Biju, A T; Sinu, C R; Paul, R R; Anu, J; Sreekumar, V (Royal Society of Chemistry, 2011)

Homoenolate is a reactive intermediate that possesses an anionic or nucleophilic carbon beta to a carbonyl group or its synthetic equivalent. The recent discovery that homoenolates can be generated from alpha,beta-unsaturated ...
N-Heterocyclic carbene (NHC) catalyzed annulation of enals and vinyl ketones: A novel synthesis of [2H]-pyranones

Vijay Nair, G; Paul, R R; Seetha Lakshmi, K C; Rajeev S Menon; Anu Jose; Sinu, C R (Elsevier, 2011)

Homoenolate annulation of vinyl ketones led to the synthesis of dihydropyranones in contrast to cyclopentenes obtained by the homoenolate annulation of chalcones, another class of alpha,beta-unsaturated ketones.
NHC catalyzed transformation of aromatic aldehydes to acids by carbon dioxide: An unexpected reaction

Vijay Nair, G; Vimal Varghese; Paul, R R; Anu, J; Sinu, C R; Rajeev S Menon (American Chemical Society, 2010)

A facile NHC-mediated reaction of aromatic aldehydes with carbon dioxide leading to carboxylic acids is described. The present protocol is mechanistically important, and it can serve as a tool for the sequestration of ...
NHC-catalysed annulation of enals to tethered dienones: efficient synthesis of bicyclic dienes

Vijay Nair, G; Sreekumar, V; Bineesh, P B; Vimal Varghese; Paul, R R; Suresh, E (Royal Society of Chemistry, 2010)

Homoenolates generated from alpha,beta-unsaturated aldehydes using NHC catalysis underwent facile addition to dibenzylidene cyclohexanone to afford bicyclic cyclopentenes as single diastereomers.
NHC-catalyzed annulation of enals and chalcones: further explorations on the novel synthesis of 1, 3,4-trisubstituted cyclopentenes

Vijay Nair, G; Paul, R R; Padmaja, D V M; Aiswarya, N; Sinu, C R; Anu Jose (Elsevier, 2011)

The facile synthesis of 1, 3, 4-trisubstituted cyclopentenes via homoenolate annulation of enals with heterocycle substituted chalcones is described.
A novel NHC-catalyzed transformation of 2H-chromene-3-carboxaldehydes to 3-methyl-2H-chromen-2-ones

Vijay Nair, G; Sinu, C R; Rejithamol, R; Seetha Lakshmi, K C; Suresh, E (Royal Society of Chemistry, 2011)

An unexpected transformation of 2H-chromene-3-carboxaldehydes to coumarin derivatives, mediated by NHC, is reported.
Nucleophilic heterocyclic carbene as a novel catalyst for cyclopropanation of cyano acrylates

Anabha, E R; Paul, R R; Suresh, E; Vijay Nair, G (Royal Society of Chemistry, 2010)

Nucleophilic heterocyclic carbenes (NHCs) have been used for the first time as catalysts in the cyclopropanation of ethyl cyanocinnamates with phenacyl bromide by Michael-initiated ring-closure (MIRC).
Recent advances in carbon-carbon bond-forming reactions involving homoenolates generated by NHC catalysis

Vijay Nair, G; Sreekumar, V; Babu, B P (Royal Society of Chemistry, 2008)

Homoenolate, a species containing anionic carbon beta to a carbonyl group or a moiety that can be transformed into a carbonyl group, is a potential three carbon synthon. Recent introduction of a protocol for the generation ...
Stereoselective synthesis of spirocyclopentanones via N-heterocyclic carbene-catalyzed reactions of enals and dienones

Vijay Nair, G; Beneesh, P B; Sreekumar, V; Suresh, E (Royal Society of Chemistry, 2008)

Homoenolates generated from enals by nucleophilic heterocyclic carbene (NHC) catalysis undergo a conjugate addition/cyclization sequence with cyclic dienones, culminating in the efficient synthesis of spirocyclopentanones.

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