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Browsing by Author "Sunil Varughese"

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Accessing Highly Functionalized Cyclopentanoids: Via a Cascade Palladation Approach: Unprecedented Benzylic C-H Activation Towards Cyclopentenoindanes

Santhini, P V; Smrithy, A S; Irfana Jesin, C P; Sunil Varughese; Jubi John; Radhakrishnan, K V (The Royal Society of Chemistry, 2018-02-23)

A Pd-catalyzed synthesis of 3,4,5-trisubstituted cyclopentenes from diazabicyclic olefins and o-iodobenzoates has been developed. The hitherto unknown cascade process involves three stages: carbopalladation, oxypalladation ...
Antibacterial and Antitubercular Evaluation of Dihydronaphthalenone-indole Hybrid Analogs

Praveen Kumar, V; Renjitha, J; Fathimath Salfeena, C T; Ashitha, K T; Keri, R S; Sunil Varughese; Sasidhar, B S (Wiley, 2017-11)

A new series of indole appended dihydronaphthalenone hybrid analogs (5a–t) have been synthesized through the Lewis acid catalyzed Michael addition of indoles to the arylidene/hetero arylidene ketones. All the synthesized ...
Equivalence of Ethylene and Azo-bridges in the modular design of molecular complexes: role of weak interactions

Ravat, P; Seetha Lekshmi, S; Biswas, S N; Nandy, P; Sunil Varughese (American Chemical Society, 2015)

Structural equivalence is a general tool applied in crystal engineering for the predictable construction of molecular assemblies. In the present contribution we analyzed the equivalence of azo (-N=N-) and ethylene (-C=C-) ...
Heteroatom Induced Contrasting Effects on the Stimuli Responsive Properties of Anthracene Based Donor-π-acceptor Fluorophores

Naeem, K C; Akhila, S; Sunil Varughese; Vijayakumar, C (Royal Society of Chemistry, 2015)

Two donor–p–acceptor type fluorophores consisting of anthracene as the donor and benzoxazole (ABO) or benzothiazole (ABT) as the acceptor are synthesised. Both fluorophores exhibit excellent solid state luminescence, and ...
Lanthanide Complex-derived White-light Emitting Solids: A Survey on Design Strategies

SeethaLekshmi, S; Ramya, A R; Reddy, M L P; Sunil Varughese (Elsevier, 2017-12)

Solid-state materials with tunable light emission characteristics offer an attractive prospect. Unique luminescence features of trivalent lanthanide (LnIII) ions—sharp characteristic emission in the visible and near-infrared ...
Molecular complexes of 4-Halophenylboronic acids: A systematic exploration of isostructurality and structural landscape

Seethalekshmi, S; Sunil Varughese; Giri, L; Pedireddi, V R (American Chemical Society, 2014)

Structural equivalence is a general tool applied in crystal engineering for the predictable construction of cocrystals. We studied 17 molecular complexes of 4-halophenylboronic acids (Cl, Br, and I) with different N-donor ...
Non-covalent routes to tune the optical properties of molecular materials

Sunil Varughese (Royal Society of Chemistry, 2014)

Switching and tuning solid state luminescence properties of molecular materials by modulating molecular packing through non-covalent routes is an attractive prospect. This strategy further makes it feasible to expand the ...
One-Pot MCR-Oxidation Approach toward Indole-Fused Heteroacenes

Santhini, P V; Akhil Krishnan, R; Sheba Ann, B; Betna, S S; Das, G; Praveen, V K; Sunil Varughese; Jubi John (American Chemical Society, 2017-09-14)

A straightforward synthetic route toward indole-fused heteroacenes was developed. The strategy is composed of a one-pot process starting with a multicomponent reaction of cyclohexanone, primary amine and N-tosyl-3-nitroindole ...
Palladium-catalyzed interceptive decarboxylative addition of allyl carbonates with carbonyl group

Baiju, T V; Nayana Joseph; Jainu Ajit; Praveen, P; Radhakrishnan, K V; Sunil Varughese; Yamamoto, Y (Georg Thieme Verlag, 2014)

The first palladium-catalyzed interceptive decarboxylative 1,4-addition of allyl carbonates with squarates is reported. Interestingly, the C-3 carbonyl group of N-substituted isatins undergoes smooth decarboxylative ...
Phosphine-mediated reaction of 3-methyl allenoate and isatins: a protocol for the synthesis of spirofuran oxindoles

Anu Jose; Jayakrishnan, A J; Seetha Lakshmi, K C; Sunil Varughese; Vijay Nair, G (Royal Society of Chemistry, 2015)

A facile synthesis of spirofuran oxindoles via phosphine-mediated reaction of 3-alkyl allenoate with isatins is presented.
A phosphine-mediated reaction of cyclic 1,2-diones and 3-alkyl allenoates: an efficient protocol for benzannulation applicable to the synthesis of polycyclic aromatic hydrocarbons

Anu Jose; Jayakrishnan, A J; Vedhanarayanan, B; Rajeev S Menon; Sunil Varughese; Suresh, E; Vijay Nair, G (Royal Society of Chemistry, 2014)

A facile one-pot benzannulation strategy involving phosphine-3-alkyl allenoate zwitterions and cyclic 1,2-diones is described. The strategy is effectively utilized in the synthesis of fluoranthenes and benzo[a]aceanthrylenes ...
Photophysical and electroluminescence properties of bis(2?,6?-difluoro-2,3?-bipyridinato-N,C4?)iridium(picolinate) complexes: effect of electron-withdrawing and electron-donating group substituents at the 4? position of the pyridyl moiety of the cyclometalated ligand

Bejoymohandas, K S; Arunandan Kumar; Sunil Varughese; Varathan, E; Subramanian, V; Reddy, M L P (Royal Society of Chemistry, 2015-07)

Herein, we have synthesized a series of 2’,6’ -difluoro-2,30-bipyridine cyclometalating ligands by substituting electron-withdrawing (–CHO, –CF3, and –CN) and electron-donating (–OMe and –NMe2) groups at the 4’ position ...
Rhodium(III)-catalyzed C-H activation of phenylazoles toward C-N bond cleavage of diazabicyclic olefins: A facile access to mono- and biscyclopentenyl-functionalized aza-heteroaromatics

Praveen, P; Aparna, P S; Jijy, E; Santhini, P V; Sunil Varughese; Radhakrishnan, K V (Georg Thieme Verlag, 2014)

A [RhCl2Cp*](2)-catalyzed stereoselective C-N bond cleavage of diazabicyclic olefins via C-H activation of phenylazoles in the presence of an acetate source is described. The developed method provides an easy access to ...
Structural and Energetic Analysis of Molecular Assemblies in a Series of Nicotinamide and Pyrazinamide Cocrystals with Dihydroxybenzoic Acids

Jarzembska, K N; Hoser, A A; Sunil Varughese; Kamiński, R; Malinska, M; Stachowicz, M; Pedireddi, V R; Woźniak, K (American Chemical Society, 2017-08-01)

Four new cocrystals of pharmaceutically active N-donor compounds, pyrazinamide (P) and nicotinamide (N), with a series of dihydroxybenzoic acids, i.e., 2,3- dihydroxybenzoic acid (23DHB), 2,4-dihydroxybenzoic acid (24DHB), ...
Synthesis of Symmetrical and Unsymmetrical Triarylpyrylium Ions Via An Inverse Electron Demand Diels–Alder Reaction

Fathimath Salfeena, C T; Basavaraja; Ashitha, K T; Praveen Kumar, V; Sunil Varughese; Suresh, C H; Sasidhar, B S (The Royal Society of Chemistry, 2018-12)

BF3 OEt2 mediated inverse electron demand Diels–Alder (IEDDA) reaction of chalcones with aryl acetylenes is reported for the synthesis of symmetrical and unsymmetrical 2,4,6-triarylpyrylium ions. The protocol provides an ...
Transformation of photophysical properties from solution to solid state in alkoxy-cyano-diphenylacetylene molecules

Venugopal, K; Prabhu, D D; Suresh Das; Sunil Varughese (Royal Society of Chemistry, 2015-07-28)

Detailed photophysical properties of cyano and mono (MA)/bis alkoxy (DA) substituted diphenylacetylene moieties with different alkyl chain lengths (methyl (1), octyl (8) and dodecyl (12)) were investigated in solution and ...
Tunable white-light emission from mixed lanthanide (Eu3+, Gd3+, Tb3+) coordination polymers derived from 4-(dipyridin-2-yl)- aminobenzoate

Ramya, A R; Sunil Varughese; Reddy, M L P (Royal Society of Chemistry, 2014)

Herein, we have developed a series of isostructural mixed Ln3+-4-(dipyridin-2-yl)aminobenzoate coordination polymers [Ln3+ = Eu3+ (1), Tb3+ (2), and Gd3+ (3)], and characterized and investigated their photophysical properties. ...

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