Search Results - "Menon, Rajeev S"

Recent advances in employing homoenolates generated by N-heterocyclic carbene (NHC) catalysis in carbon-carbon bond-forming reactions by Menon, Rajeev S, Biju, Akkattu T, Nair, Vijay

“…The use of NHCs for generating homoenolate species has gained widespread popularity in recent years. A number of highly stereoselective processes of…”
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Recent advances in N-heterocyclic carbene (NHC)-catalysed benzoin reactions by Menon, Rajeev S, Biju, Akkattu T, Nair, Vijay

“…N-Heterocyclic carbenes (NHCs) have emerged as a powerful class of organocatalysts that mediate a variety of organic transformations. The Benzoin reaction…”
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The Au(I)-Catalyzed Intramolecular Hydroarylation of Terminal Alkynes Under Mild Conditions: Application to the Synthesis of 2H-Chromenes, Coumarins, Benzofurans, and Dihydroquinolines by Menon, Rajeev S, Findlay, Alison D, Bissember, Alex C, Banwell, Martin G

“…Operationally simple Au(I)-catalyzed intramolecular hydroarylation (IMHA) reactions of terminal alkynes that proceed in high yield and under very mild…”
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Engaging Zwitterions in Carbon−Carbon and Carbon−Nitrogen Bond-Forming Reactions:  A Promising Synthetic Strategy by Nair, Vijay, Menon, Rajeev S, Sreekanth, A. R, Abhilash, N, Biju, A. T

“…An Account of carbon−carbon and carbon−nitrogen bond-forming reactions mediated by zwitterions generated by the addition of organic nucleophiles to activated…”
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Regioselective Synthesis of Arylsulfonyl Benzophenones via Aerobic Oxidative [3+3] Benzannulation Reactions by Yadav, Deepak, Joshi, Prabhakar R., Sharma, Sunil K., Menon, Rajeev S.

“…Regioselective synthesis of 3‐arylsulfonyl benzophenone derivatives via base mediated, aerial‐oxidative [3+3] benzannulation of α,β‐unsaturated aldehydes and…”
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NHC Catalyzed Transformation of Aromatic Aldehydes to Acids by Carbon Dioxide: An Unexpected Reaction by Nair, Vijay, Varghese, Vimal, Paul, Rony Rajan, Jose, Anu, Sinu, C. R., Menon, Rajeev S.

“…A facile NHC-mediated reaction of aromatic aldehydes with carbon dioxide leading to carboxylic acids is described. The present protocol is mechanistically…”
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Facile synthesis of 4H-chromene derivatives via base-mediated annulation of ortho-hydroxychalcones and 2-bromoallyl sulfones by Thadkapally, Srinivas, Kunjachan, Athira C, Menon, Rajeev S

“…The cesium carbonate-mediated reaction of 2-bromoallyl sulfones and ortho-hydroxychalcones furnished 3-arylsulfonyl-4H-chromene derivatives in 58-67% yield (18…”
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Benzannulation Reactions: A Case for Perspective Change From Arene Decoration to Arene Construction by Swami, Bhawna, Yadav, Deepak, Menon, Rajeev S.

“…Benzannulation reactions involve construction of a benzene ring from acyclic precursors. This class of reactions offer a versatile and often superior…”
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Base-Mediated Cyclocondensation of Salicylaldehydes and 2‑Bromoallyl Sulfones for the Synthesis of 3‑Sulfonylchromene Derivatives and Their Regioselective Friedel–Crafts Heteroarylation Reactions by Kumar, Anand, Thadkapally, Srinivas, Menon, Rajeev S

“…Cesium carbonate-mediated reaction of 2-hydroxybenzaldehydes and 2-bromoallyl sulfones afforded 2H- and 4H-chromenol derivatives endowed with a 3-arylsulfonyl…”
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Catalyst-controlled divergence in cycloisomerisation reactions of N-propargyl-N-vinyl sulfonamides: gold-catalysed synthesis of 2-sulfonylmethyl pyrroles and dihydropyridines by Undeela, Sridhar, Thadkapally, Srinivas, Nanubolu, Jagadeesh Babu, Singarapu, Kiran Kumar, Menon, Rajeev S

“…Gold-catalysed, divergent synthesis of 2-sulfonylmethyl pyrroles and dihydropyridines from N-propargyl-N-vinyl sulfonamides has been achieved. Echavarren's…”
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A formal vinylic substitution reaction for the synthesis of α,β-unsaturated enol esters and their anticancer potential by Swami, Bhawna, Kumari, Neetu, Maruthi, Mulaka, Kunjunny, Neethu K, Menon, Rajeev S

“…Arylsulfonyl group-bearing α,β-unsaturated enol esters were readily assembled the Cs CO -mediated union of 2-bromoallyl sulfones and cinnamic acids. The…”
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Pyridine-Catalyzed Addition of Diaryl-1,2-diones to Dimethyl Butynedioate Leading to the Formation of 1,2-Diaroyl Dimethyl Maleates via an Unprecedented Rearrangement by Nair, Vijay, Pillai, Abhilash N, Menon, Rajeev S, Suresh, Eringathodi

“…Pyridine catalyzes the reaction of 1,2-diaryl diones with dimethyl butynedioate to afford diaroyl maleates. This unprecedented rearrangement involves a unique…”
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Nucleophile‐Initiated Catalytic and Multicomponent Reactions by Nair, Vijay, Menon, Rajeev S.

“…A number of well‐known reactions, proceed through the intermediacy of dipolar/zwitterionic species generated via the addition of a neutral nucleophile with an…”
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A facile three-component reaction involving [4+1] cycloaddition leading to furan annulated heterocycles by Nair, Vijay, Menon, Rajeev S, Vinod, A.U, Viji, S

“…The in situ generated quinone methides from 4-hydroxycoumarin and 4-hydroxy-6-methylpyrone with various aldehydes underwent facile reaction with cyclohexyl…”
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Oxygenative and Dehydrogenative [3 + 3] Benzannulation Reactions of α,β-Unsaturated Aldehydes and γ‑Phosphonyl Crotonates Mediated by Air: Regioselective Synthesis of 4‑Hydroxybiaryl-2-carboxylates by Joshi, Prabhakar Ramchandra, Nanubolu, Jagadeesh Babu, Menon, Rajeev S

“…Regioselective synthesis of 4-hydroxybiphenyl-2-carboxylates via the base-mediated oxygenative [3 + 3] benzannulation reaction of α,β-unsaturated aldehydes and…”
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Regioselective Synthesis of Substituted Arenes via Aerobic Oxidative [3 + 3] Benzannulation Reactions of α,β-Unsaturated Aldehydes and Ketones by Joshi, Prabhakar Ramchandra, Undeela, Sridhar, Reddy, Doni Dhanoj, Singarapu, Kiran Kumar, Menon, Rajeev S

“…Facile conversion of α,β-unsaturated aldehydes and ketones into highly substituted arenes via a base-mediated, completely regioselective, air-oxidative [3 + 3]…”
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The facile synthesis of 1-benzoazepine derivatives via gold-catalyzed regioselective cycloisomerization reactions of N-(o-alkynylaryl)-N-vinyl sulfonamides by Undeela, Sridhar, Ravikumar, Gurram, Nanubolu, Jagadeesh Babu, Singarapu, Kiran Kumar, Menon, Rajeev S

“…Gold-catalyzed, regioselective cycloisomerization of N-(o-alkynylaryl)-N-vinyl sulfonamides afforded high yields of 2-sulfonylmethyl-1-benzoazepine…”
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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 by Jose, Anu, A J, Jayakrishnan, Vedhanarayanan, Balaraman, Menon, Rajeev S, Varughese, Sunil, Suresh, Eringathodi, Nair, Vijay

“…A facile one-pot benzannulation strategy involving phosphine-3-alkyl allenoate zwitterions and cyclic 1,2-diones is described. The strategy is effectively…”
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Total syntheses of the furanosesquiterpenes crassifolone and dihydrocrassifolone via an Au(I)-catalysed intramolecular Michael addition reaction by Menon, Rajeev S, Banwell, Martin G

“…The racemic modifications of title natural products 1 and 2 have been synthesised for the first time. The key step was the Au(i)-catalysed conversion of the…”
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N-Heterocyclic carbene (NHC) catalyzed annulation of enals and vinyl ketones: a novel synthesis of [2 H]-pyranones by Nair, Vijay, Paul, Rony Rajan, Seetha Lakshmi, K.C., Menon, Rajeev S., Jose, Anu, Sinu, C.R.

“…Homoenolate annulation of vinyl ketones led to the synthesis of dihydropyranones in contrast to cyclopentenes obtained by the homoenolate annulation of…”
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