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Your search keyword '"Bhargava, Gaurav"' showing total 6 results
Start Over Author "Bhargava, Gaurav" Publication Year Range Last 50 years Publication Type Academic Journals Journal tetrahedron letters: international organ for the rapid publication of preliminary communications in organic chemistry
6 results on '"Bhargava, Gaurav"'

1. A regio and diastereoselective transformation of 3-dienyl-2-azetidinones to novel pyrroloxazine

Author

Anand, Amit, Bhargava, Gaurav, Kumar, Vipan, and Mahajan, Mohinder P.

Subjects
*LACTAMS, *DIELS-Alder reaction, *PHASE transitions, *RING formation (Chemistry), *BENZENE, *HETEROCYCLIC compounds, *SODIUM compounds, *SUBSTITUTION reactions
Abstract

Abstract: The regioselective nitroso Diels–Alder (NDA) cycloadditions of 3-dienyl-2-azetidinones with nitrosobenzene to generate oxazine-substituted β-lactams in excellent yields are reported. The amidiolytic ring opening of the cycloadducts with sodium methoxide followed by iodocyclization using I2/K2CO3 etiquette to capitulate previously unknown, multisubstituted pyrroloxazine in outstanding yields is also accounted. [Copyright &y& Elsevier]

Published
2010
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2. Lewis acid promoted aza Diels–Alder reactions of acyclic unactivated 5-dienyl pyrimidinones with N-arylimines: synthesis of novel quinoline derivatives

Author

Bhargava, Gaurav, Kumar, Vipan, and Mahajan, Mohinder P.

Subjects
*ACID-base chemistry, *PYRIMIDINES, *LEWIS acids, *QUINOLINE
Abstract

Abstract: The chemo- as well as regioselective aza Diels–Alder reactions of 5-dienyl pyrimidinones with N-arylimines in the presence of a Lewis acid catalyst resulting in novel quinoline derivatives are reported. [Copyright &y& Elsevier]

Published
2007
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3. Diastereoselective approach to novel octahydroisoquinolones and an extension to its one-pot synthesis

Author

Singh, Pardeep, Bhargava, Gaurav, Kumar, Vipan, and Mahajan, Mohinder P.

Subjects
*STEREOCHEMISTRY, *HETEROCYCLIC compounds, *ORGANIC synthesis, *ESTERS, *SUBSTITUTION reactions, *LACTAMS
Abstract

Abstract: The present Letter describes the use of β-lactams for the synthesis of functionalized β-amino esters and their transformation to trisubstituted octahydroisoquinolone derivatives in good yields with an extension to their one-pot synthesis. [Copyright &y& Elsevier]

Published
2010
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4. An unprecedented methylene oxidation accompanying the aza Diels–Alder reactions of acyclic unactivated alkenes: synthesis of novel quinolin-3-one substituted pyrimidinone derivatives

Author

Mohan, Chander, Bhargava, Gaurav, Pannu, A.P.S., and Mahajan, Mohinder P.

Subjects
*DIELS-Alder reaction, *ALKENES, *PYRIMIDINES, *METHANE
Abstract

Abstract: The regioselective aza Diels–Alder reactions of isopropenyl pyrimidinone with N-arylimines in the presence of Y/Sc triflates as catalyst are described. An unprecedented oxidation of methylene to carbonyl occurred resulting in exclusive formation of 6-oxo-1,6-dihydropyrimidin-5-yl-4H-quinolin-3-one derivatives. [Copyright &y& Elsevier]

Published
2007
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5. Nickel catalyzed [3+2] cycloaddition reaction of bis(methylenecyclopropane) with cyclic and acyclic dienophiles.

Author

Kuila, Bilash, Mahajan, Dinesh, Singh, Prabhpreet, and Bhargava, Gaurav

Subjects
*NICKEL catalysts, *RING formation (Chemistry), *METHYLENECYCLOPROPANE, *DIENOPHILES, *MICROWAVES
Abstract

Nickel catalyzed [3+2] cycloaddition reactions of bis(methylenecyclopropane) with cyclic and acyclic dienophiles have been explored. The reactions resulted in the formation of functionalized cyclopentanes in good yields. The reactions were also explored under microwave irradiation for the first time to yield [3+2] cycloadducts in short reaction time and high yields. [ABSTRACT FROM AUTHOR]

Published
2015
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6. Metal-free diastereoselective synthesis of diaza-bicyclo[3.2.0]heptan-7-one and its transformation to functionalized proline esters.

Author

Kumar, Yogesh, Kuila, Bilash, Mahajan, Dinesh, Singh, Prabhpreet, Mohapatra, Balaram, and Bhargava, Gaurav

Subjects
*HEPTANONES, *CHEMICAL synthesis, *STEREOCHEMISTRY, *PROLINE, *AMINATION, *LACTAMS
Abstract

Abstract: A metal-free diastereoselective synthesis of novel 4-halo-3,6-di-aryl-2,6-diaza-bicyclo[3.2.0]heptan-7-one by intramolecular endo-trig haloamination of 3-amino-2-azetidinone is reported. The amidiolytic ring opening of diaza-bicyclo[3.2.0]heptan-7-one with sodium methoxide provides an easy access to previously unknown 4-halo-3-aryl amino-pyrrolidine-2-carboxylic acid methyl esters in good yields. [Copyright &y& Elsevier]

Published
2014
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