Search Results - "Laxminarayana, Keetha"

Simple and Efficient Metal-free Hydroarylation and Hydroalkylation Using Strongly Acidic Ion-exchange Resin by Das, Biswanath, Krishnaiah, Martha, Laxminarayana, Keetha, Damodar, Kongara, Kumar, D. Nandan

“…Higly efficient hydroarylation and hydroalkylation of styrenes with various arenes and 1,3-dicarbonyl compounds respectively have been developed using…”
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Silica Supported Phosphomolybdic Acid: An Efficient Heterogeneous Catalyst for Friedlander Synthesis of Quinolines by Das, Biswanath, Krishnaiah, Martha, Laxminarayana, Keetha, Nandankumar, Duddukuri

“…Silica supported phosphomolybdic acid, an eco-friendly heterogeneous catalyst, has been found to be highly efficient for Friedlander synthesis of quinolines in…”
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Efficient synthesis of homoallylic alcohols and amines using 2,4,6-trichloro-1,3,5-triazine by Das, Biswanath, Laxminarayana, Keetha, Ravikanth, B., Ramarao, B.

“…The allylation of aldehydes and imines has efficiently been carried out by treatment with allyltributylstannane in the presence of a catalytic amount of…”
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An efficient synthesis of benzyl bromides from aromatic aldehydes using polymethylhydrosiloxane and (bromodimethyl)sulfonium bromide or N-bromosuccinimide by Das, Biswanath, Srinivas, Yallamalla, Holla, Harish, Laxminarayana, Keetha, Narender, Ravirala

“…Polymethylhydrosiloxane (PMHS) in combination with (bromodimethyl)sulfonium bromide or NBS has been utilized for the first time for reductive bromination of…”
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New Macrocyclic Diterpenoids from Jatropha multifida by Das, Biswanath, Ravikanth, Bommena, Laxminarayana, Keetha, Ramarao, Bethapudi, Raju, Tuniki Venugopal

“…Chemical investigation on the stems of Jatropha multifida resulted in the isolation of two new macrocyclic diterpenoids whose structures were established by…”
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Part 148 in the Series "Studies on Novel Synthetic Methodologies:" Selective Acetylation of Alcohols, Phenols and Amines and Selective Deprotection of Aromatic Acetates using Silica-Supported Phosphomolybdic Acid by Das, Biswanath, Thirupathi, Ponnaboina, Kumar, Rathod Aravind, Laxminarayana, Keetha

“…An environmentally friendly silica‐supported phosphomolybdic acid was found to be a highly efficient catalyst for the selective acetylation of alcohols,…”
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Silica-supported Phosphomolybdic Acid-catalyzed Efficient Synthesis of 1,8-Dioxooctahydroxanthene and Tetrahydrochromene Derivatives by Das, Biswanath, Krishnaiah, Martha, Laxminarayana, Keetha, Damodar, Kongara, Kumar, Duddukuri Nandan

“…Silica-supported phosphomolybdic acid was found to be an efficient heterogeneous catalyst for the synthesis of 1,8-dioxooctahydroxanthenes from aldehydes and…”
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Vanadium(III) Chloride (VCl3): Efficient Reagent for the Introduction of Tetrahydrofuran-Based Acetal Protecting Groups for Alcohols by Das, Biswanath, Krishnaiah, Maddeboina, Reddy, Vtukuri Saidi, Laxminarayana, Keetha

“…Treatment of different types of alcohols with tetrahydrofuran (THF) in the presence of VCl3 and CCl4 smoothly afforded the corresponding THF‐based acetals in…”
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Iodine catalyzed preparation of amidoalkyl naphthols in solution and under solvent-free conditions by Das, Biswanath, Laxminarayana, Keetha, Ravikanth, B., Rao, B. Rama

“…A one-pot three-component reaction of 2-naphthol, aldehydes and urea or amides has efficiently been carried out in the presence of iodine in dichloroethane at…”
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Stereoselective total synthesis of a potent natural antifungal compound (6S)-5,6,dihydro-6-[(2R)-2-hydroxy-6-phenyl hexyl]-2H-pyran-2-one by DAS, Biswanath, LAXMINARAYANA, Keetha, KRISHNAIAH, Martha, DUDDUKURI NANDAN KUMAR

“…A practical stereoselective synthesis of (6S)-5,6,dihydro-6-[(2R)-2-hydroxy-6-phenyl hexyl]-2H-pyran-2-one, a potent natural antifungal compound, is described…”
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An efficient catalyst-free regio- and stereoselective ring-opening of epoxides with phenoxides using polyethylene glycol as the reaction medium by Das, Biswanath, Krishnaiah, Maddeboina, Thirupathi, Ponnaboina, Laxminarayana, Keetha

“…A catalyst-free regio- and stereoselective ring-opening of epoxides with phenoxides has been carried out efficiently using polyethylene glycol as the reaction…”
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Multidione, a novel diterpenoid from Jatropha multifida by Das, Biswanath, Laxminarayana, Keetha, Krishnaiah, Martha, Srinivas, Yallamalla, Raju, Tuniki Venugopal

“…A novel diterpenoid, multidione, has been isolated from the stems of Jatropha multifida and its structure has been settled from 1D and 2D NMR spectra. The…”
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Application of heterogeneous catalysts for an efficient synthesis of β-keto enol ethers by Das, Biswanath, Laxminarayana, Keetha, Ravikanth, B.

“…The synthesis of β-keto enol ethers involving the treatment of cyclic β-diketones with alcohols in the presence of various heterogeneous catalysts has been…”
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A simple and efficient one-pot synthesis of β-acetamido carbonyl compounds using sulfated zirconia as a heterogeneous recyclable catalyst by Das, Biswanath, Krishnaiah, Maddeboina, Laxminarayana, Keetha, Reddy, K. Ravinder

“…Sulfated zirconia has been employed as an efficient recyclable catalyst for the preparation of various β-acetamidoketones or esters at room temperature. The…”
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A Stereoselective Total Synthesis of Verbalactone by Das, Biswanath, Laxminarayana, Keetha, Krishnaiah, Martha, Kumar, Duddukuri Nandan

“…A stereoselective total synthesis of verbalactone has been achieved starting from commercially available hexanal. The sequence involves Maruoka allylation,…”
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New diterpenoids from Caesalpinia species and their cytotoxic activity by Das, Biswanath, Srinivas, Yallamalla, Sudhakar, Chithaluri, Mahender, Ibram, Laxminarayana, Keetha, Reddy, Parigi Raghavendar, Raju, Tuniki Venugopal, Jakka, Naga Mahesh, Rao, Janapala Venkateswara

“…Chemical investigation on Caesalpinia crista afforded two new diterpenoids, 6β-cinnamoyloxy-7β-acetoxyvouacapen-5α-ol and 6β,7β-dibenzoyloxyvouacapen-5α-ol and…”
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Perchloric Acid-Silica (HClO4⋅SiO2)-Catalyzed Synthesis of 14-Alkyl- or 14-Aryl-14H-dibenzo[a,j]xanthenes and N-[(2-Hydroxynaphthalen-1-yl)methyl]amides by Das, Biswanath, Kumar, D. Nandan, Laxminarayana, Keetha, Ravikanth, B.

“…The synthesis of 14‐aryl‐ or 14‐alkyl‐14H‐dibenzo[a,j]xanthenes 3 involving the treatment of naphthalen‐2‐ol (1) with arenecarboxaldehydes or alkanals 2 in the…”
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Stereoselective total synthesis of a potent natural antifungal compound (6 S)-5,6,dihydro-6-[(2 R)-2-hydroxy-6-phenyl hexyl]-2 H-pyran-2-one by Das, Biswanath, Laxminarayana, Keetha, Krishnaiah, Martha, Kumar, Duddukuri Nandan

“…A practical stereoselective synthesis of (6 S)-5,6,dihydro-6-[(2 R)-2-hydroxy-6-phenyl hexyl]-2 H-pyran-2-one ( 1), a potent natural antifungal compound, is…”
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Silica Supported Phosphomolybdic Acid by Das, Biswanath, Krishnaiah, Martha, Laxminarayana, Keetha, Nandankumar, Duddukuri

“…Silica supported phosphomolybdic acid, an eco-friendly heterogeneous catalyst, has been found to be highly efficient for Friedlander synthesis of quinolines in…”
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Perchloric Acid–Silica (HClO 4 ⋅SiO 2 )‐Catalyzed Synthesis of 14‐Alkyl‐ or 14‐Aryl‐14 H ‐dibenzo[ a , j ]xanthenes and N ‐[(2‐Hydroxynaphthalen‐1‐yl)methyl]amides by Das, Biswanath, Kumar, D. Nandan, Laxminarayana, Keetha, Ravikanth, B.

“…The synthesis of 14‐aryl‐ or 14‐alkyl‐14 H ‐dibenzo[ a , j ]xanthenes 3 involving the treatment of naphthalen‐2‐ol ( 1 ) with arenecarboxaldehydes or alkanals…”
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