Browsing Department of Chemistry by Author "Kumar, Indresh"

Now showing items 1-20 of 45

1,3-Carbon D–A strategy for [3 + 2] cycloadditions/annulations with imines: synthesis of functionalized pyrrolidines and related alkaloids

Kumar, Indresh (RSC, 2014)

Cycloaddition/annulation reactions remain the most attractive methods for the synthesis of five membered heterocyclic ring systems. Among the three possible strategies for [3 + 2] cycloaddition, this review focuses on ...
2-Iodoxybenzoic Acid (IBX): A Versatile Reagent

Kumar, Indresh (Thieme, 2005)

The importance of hypervalent iodine reagents in organic chemistry has been demonstrated in recent years, and they have been found to have several desirable properties: they are mild, selective, efficient and eco-friendly. ...
4-Methoxy-N-(4-nitrobenzyl)aniline

Kumar, Indresh (ACTA, 2012)

In the title compound, C(14)H(14)N(2)O(3), the nitro group is nearly coplanar with the benzene ring to which it is bonded [dihedral angle = 1.70 (2)°], and this ring is para-substituted by the amino-methyl-ene group. The ...
Assembly of Gold Nanoparticles on Single-Walled Carbon Nanotubes by Using Click Chemistry

Kumar, Indresh (Ingenta, 2009-05)

Azide moiety-functionalized gold nanoparticles were conjugated with acetylene functionalized single-walled carbon nanotubes by employing copper-catalyzed Huisgen's [3+2] dipolar cycloaddition 'click chemistry' reaction. ...
Asymmetric synthesis of a 3,4-substituted pyrrolidine by l-proline catalyzed direct enolexo aldolization

Kumar, Indresh (Elsiever, 2007-06-11)

The asymmetric synthesis of a 3,4-substituted N-tosyl pyrrolidine has been achieved by using l-proline catalyzed 5-enolexo aldolization with high enantio and diastereoselectivity.
Asymmetric trienamine catalysis: new opportunities in amine catalysis

Kumar, Indresh (RSC, 2013)

Amine catalysis, through HOMO-activating enamine and LUMO-activating iminium-ion formation, is receiving increasing attention among other organocatalytic strategies, for the activation of unmodified carbonyl compounds. ...
Cycloaddition Reactions: A Controlled Approach for Carbon Nanotube Functionalization

Kumar, Indresh (Wiley, 2011-08-31)

The functionalization of carbon nanotubes (CNTs) by means of cycloaddition reactions plays an important role in achieving mechanical, electrical, and biological functions and enhancing their dispersion in different matrixes. ...
Direct Amine-Catalyzed Enantioselective Synthesis of Pentacyclic Dibenzo[b,f][1,4]oxazepine/Thiazepine-Fused Isoquinuclidines along with DFT Calculations

Kumar, Dalip; Kumar, Indresh (ACS, 2020-10-08)

A direct protocol for the asymmetric synthesis of dibenzoxazepine/thiazepine-fused [2.2.2] isoquinuclidines is developed. The reaction proceeds through a proline-catalyzed direct Mannich reaction followed by an intramolecular ...
Direct Amine-Catalyzed Enantioselective Synthesis of Pentacyclic Dibenzo[b,f][1,4]oxazepine/Thiazepine-Fused Isoquinuclidines along with DFT Calculations

Kumar, Indresh; Kumar, Dalip (ACS, 2020)

A direct protocol for the asymmetric synthesis of dibenzoxazepine/thiazepine-fused [2.2.2] isoquinuclidines is developed. The reaction proceeds through a proline-catalyzed direct Mannich reaction followed by an intramolecular ...
Direct catalytic synthesis of densely substituted 3-formylpyrroles from imines and 1,4-ketoaldehydes

Kumar, Indresh (RSC, 2014)

A sustainable method for the direct access to highly substituted 3-formylpyrroles from 1,4-ketoaldehydes and imine via formal [3 + 2] cycloaddition is reported. This reaction involves a one-pot amine catalyzed chemoselective ...
Direct catalytic synthesis of β-(C3)-substituted pyrroles: a complementary addition to the Paal–Knorr reaction

Kumar, Indresh (RSC, 2021)

The synthesis of β-(C3)-functionalized pyrroles is a challenging task and requires a multistep protocol. An operationally simple direct catalytic synthesis of β-substituted pyrroles has been developed. This one-pot ...
Dynamic Equilibrium: Is it an important concept in chemical biology?

Kumar, Indresh (IISC, 2011)

Dynamic equilibrium is one of the important aspects of study, because its existence can be observed in the infinitesimally small cells within the body to the huge adversities of the nature. In organic chemistry, a single ...
Efficient Synthesis of Fused 1,2,3-Triazolo-δ-lactams Using Huisgen [3 + 2] Dipolar Cycloaddition “Click-chemistry” in Water

Kumar, Indresh (CSJ, 2007)

A general approach for the quick synthesis of various 1,2,3-triazolo-δ-lactams has been described, which involves the Huisgen [3 + 2] dipolar cycloaddition of azides derived from different amino acids with dimethyl ...
Enantio- and Diastereoselective Two-Pot Synthesis of Isoquinuclidines from Glutaraldehyde and N-Aryl Imines with DFT Calculations

Kumar, Indresh (ACS, 2019-09-05)

A pot-economic method for the enantio- and diastereoselective synthesis of a [2.2.2] azabicyclic isoquinuclidine system is developed. This protocol involves the proline-catalyzed direct Mannich reaction-cyclization/IBX-mediated ...
Enantioselective synthesis of 1,2,5,6-tetrahydropyridines (THPs) via proline-catalyzed direct Mannich-cyclization/domino oxidation–reduction sequence: application for medicinally important N-heterocycles

Kumar, Indresh (RSC, 2016)

An enantioselective multi-component synthesis of 1,2,5,6-tetrahydropyridines (THPs) has been developed through a one-pot domino-process. This transformation proceeds through proline-catalyzed direct Mannich reaction-cyclization ...
Enantioselective Synthesis of N-PMP-1,2-dihydropyridines via Formal [4 + 2] Cycloaddition between Aqueous Glutaraldehyde and Imines

Kumar, Indresh (ACS, 2015-10-30)

A simple and highly practical one-pot formal [4 + 2] cycloaddition approach for the enantioselective synthesis of N-PMP-1,2-dihydropyridines (DHPs) is described. This chemistry involves an amino-catalytic direct Mannich ...
Facile and Highly Selective Deprotection of tert‐Butyldimethyl Silyl Ethers using Sulfated SnO2 as a Solid Catalyst

Kumar, Indresh (Taylor & Francis, 2008)

Highly selective deprotection of tert‐butyldimethylsilyl ethers at room temperature has been described using sulfated SnO2 as an efficient solid catalyst.
Functionalization of Single-Walled Carbon Nanotubes with Azides Derived from Amino Acids Using Click Chemistry

Kumar, Indresh (Ingenta, 2008-07)

Single-walled carbon nanotubes (SWCNTs) were chemically functionalized with amino acid-based moieties. The covalent functionalization of alkyne-derived SWCNTs with well defined azides derived from amino acids was accomplished ...
Highly enantioselective [4+2] annulation via organocatalytic Mannich-reductive cyclization: one-pot synthesis of functionalized piperidines

Kumar, Indresh (RSC, 2013)

A new method for one-pot synthesis of 2,3-substituted piperidine from N-PMP aldimine and aqueous glutaraldehyde via formal [4+2] cycloaddition is reported. This reaction involves organocatalytic direct Mannich reaction–reductive ...
Intramolecular Huisgen [3+2] cycloaddition in water: synthesis of fused pyrrolidine–triazoles

Kumar, Indresh (Elsiever, 2012-02)

The intramolecular alkyne–azide Huisgen [3+2] cycloaddition reaction as a ‘click-chemistry’ reaction without a metal catalyst has been studied under aerobic conditions. The synthesis of various pyrrolidine–triazole hybrid ...

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