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Bairwa M, Verma RK, Bharadwaj KC. Domino Sequence of Ketimization and Electrophilic Amination for an Inverse Aza Intramolecular Morita-Baylis-Hillman Adduct. J Org Chem 2024. [PMID: 39361826 DOI: 10.1021/acs.joc.4c01542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2024]
Abstract
Morita-Baylis-Hillman (MBH) reaction, typically catalyzed by a Lewis base, is a popular and useful method for C-C bond formation. Unfortunately, it is limited by a slow reaction rate and has sensitivity toward steric and electronic parameters. Despite tremendous efforts, the versatility of the reaction keeps the quest open for new mechanistic and catalytic pathways. Here, we have reported a Bro̷nsted acid-catalyzed, electrophilic amination (Umpolung of imine) as a method for an inverse Aza Intramolecular MBH adduct in the form of 2-acylindole. Umpolung of imine with nitrogen acting as an electrophilic center has been achieved. Interestingly, the reaction was also shown to occur under catalyst-free conditions also. The expected products of ketimine formation, 6π electrocyclization, or quinoline formation were least/not observed. A large number of examples have demonstrated the reaction strength. β-aryl-substituted acrylate and acrylamide (cinnamates and cinnamides), which are extremely sluggish in conventional MBH chemistry, are the highlights of the developed methodology. The annulated product exhibited keto-enol tautomerism, which was proven by 1H NMR integrals. As an application, another tandem reaction in the form of Michael addition on a highly complex amine was carried out to provide spiro-annulated indole.
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Affiliation(s)
- Mansingh Bairwa
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Rakesh Kumar Verma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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2
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Bharadwaj KC. Chemoselective Intramolecular Morita-Baylis-Hillman Reaction; Acrylamide and Ketone as Sluggish Reacting Partners on a Labile Framework. J Org Chem 2024. [PMID: 38164748 DOI: 10.1021/acs.joc.3c02168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Chemoselectivity is an important issue frequently encountered while working over labile precursors. Carbonyl compounds with a heteroatom at the β carbon are sensitive precursors because they are prone to elimination under different conditions. Morita-Baylis-Hillman (MBH) reaction, although a widespread method for C-C bond formation, has its own limitations. Acrylamide and ketone are such limitations of the MBH reaction. Using them together for an intramolecular MBH (IMBH) reaction on a labile framework prone to elimination is a significant 2-fold synthetic challenge. A highly chemoselective IMBH reaction on such precursors has been established using 1,4-diazabicyclo[2.2.2]octane (DABCO) as a promoter. The protocol leads to quick access to a diversely substituted and functionalized piperidone framework in high yields. Various substitution patterns in the form of 34 successful examples have been studied. A diastereoselective version and tolerance to various functional and protecting groups are the added advantages of the developed methodology. A tertiary carbon at the β position of ketone, however, led to complete reversal of selectivity and gave only the elimination product. Control experiments toward a better understanding of the substitution pattern, role of catalyst, and mechanistic study have been carried out. As an application of the IMBH adduct, a one-step allylic rearrangement for the dihydropyridone framework has also been demonstrated.
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3
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Azaz T, Mourya H, Singh V, Ram B, Tiwari B. Reductive Alkenylation of Ketimines via Hydride Transfer from Aldehydes. J Org Chem 2023; 88:632-639. [PMID: 36475729 DOI: 10.1021/acs.joc.2c01508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first direct N-heterocyclic carbene (NHC)-catalyzed preparation of allylic amines bearing a quaternary center (α-tertiary amine) from isatin-derived ketimines in the presence of vinyl selenones and aldehydes is reported. This multicomponent reaction is expected to proceed via unprecedented in situ reduction of imines through a hydride transfer from the aldehydes.
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Affiliation(s)
- Tazeen Azaz
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India.,Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Hemlata Mourya
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India
| | - Vikram Singh
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India.,Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Bali Ram
- Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
| | - Bhoopendra Tiwari
- Department of Biological and Synthetic Chemistry, Centre of Biomedical Research, SGPGIMS-Campus, Raebareli Road, Lucknow 226014, India
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Makra Z, Madácsi R, Martinek A. T, Bényei A, Puskás LG, Gyuris M, Kanizsai I. Phosphine(III)‐Triggered One‐Pot Domino Sequences towards 5,6‐Dihydropyridine‐2‐(1H)‐one and Pyridine‐2(1H)‐one Scaffolds. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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5
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Pitchumani V, Breugst M, Lupton DW. Enantioselective Rauhut-Currier Reaction with β-Substituted Acrylamides Catalyzed by N-Heterocyclic Carbenes. Org Lett 2021; 23:9413-9418. [PMID: 34842439 DOI: 10.1021/acs.orglett.1c03554] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
β-Substituted acrylamides have low electrophilicity and are yet to be exploited in the enantioselective Rauhut-Currier reaction. By exploiting electron-withdrawing protection of the amide and moderate nucleophilicity N-heterocyclic carbenes, such substrates have been converted to enantioenriched quinolones. The reaction proceeds with complete diastereoselectivity, good yield, and modest enantioselectivity. Derivatizations are reported, as are computational studies, supporting decreased amide bond character with electron-withdrawing protection of the nitrogen.
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Affiliation(s)
| | - Martin Breugst
- Department für Chemie, Universität zu Köln, 50939 Köln, Germany
| | - David W Lupton
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia
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6
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Yue X, Verrier C, Ahmar M, Queneau Y. Reactivity of secondary N-alkyl acrylamides in Morita–Baylis–Hillman reactions. CR CHIM 2021. [DOI: 10.5802/crchim.117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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7
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Fernandes FS, Santos H, Lima SR, Conti C, Rodrigues MT, Zeoly LA, Ferreira LLG, Krogh R, Andricopulo AD, Coelho F. Discovery of highly potent and selective antiparasitic new oxadiazole and hydroxy-oxindole small molecule hybrids. Eur J Med Chem 2020; 201:112418. [PMID: 32590115 DOI: 10.1016/j.ejmech.2020.112418] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/01/2020] [Accepted: 05/02/2020] [Indexed: 11/26/2022]
Abstract
A series of highly active hybrids were discovered as novel antiparasitic agents. Two heterocyclic scaffolds (1,2,4-oxadiazole and 3-hydroxy-2-oxindole) were linked, and the resulting compounds showed in vitro activities against intracellular amastigotes of two protozoan parasites, Trypanosoma cruzi and Leishmania infantum. Their cytotoxicity was assessed using HFF-1 fibroblasts and HepG2 hepatocytes. Compounds 5b, 5d, 8h and 8o showed selectivity against L. infantum (IC50 values of 3.89, 2.38, 2.50 and 2.85 μM, respectively). Compounds 4c, 4q, 8a and 8k were the most potent against T. cruzi, exhibiting IC50 values of 6.20, 2.20, 2.30 and 2.20 μM, respectively. Additionally, the most potent anti-T. cruzi compounds showed in vitro efficacies comparable or superior to that of benznidazole. These easy-to-synthesize molecules represent novel chemotypes for the design of potent and selective lead compounds for Chagas disease and leishmaniasis drug discovery.
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Affiliation(s)
- Fábio S Fernandes
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Hugo Santos
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Samia R Lima
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Caroline Conti
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Manoel T Rodrigues
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Lucas A Zeoly
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Leonardo L G Ferreira
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil
| | - Renata Krogh
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil
| | - Adriano D Andricopulo
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil.
| | - Fernando Coelho
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil.
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Synthesis, anti-proliferative activity, theoretical and 1H NMR experimental studies of Morita-Baylis-Hillman adducts from isatin derivatives. Mol Divers 2019; 24:265-281. [PMID: 30955150 DOI: 10.1007/s11030-019-09950-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 03/28/2019] [Indexed: 10/27/2022]
Abstract
Quaternary or spirocyclic 3-substituted-3-hydroxy-2-oxindole is considered a privileged scaffold. In other words, it is a molecular core present on several compounds with a wide spectrum of biological activities. Among its precursors, activated ketones (isatin nucleus) can be used as interesting starting points to Morita-Baylis-Hillman adducts derivatives, a class of compounds with good cytotoxic potential. In this paper, we present the synthesis, anti-proliferative activity against lung cancer cell line and a theoretical conformational study of 21 of Morita-Baylis-Hillman adducts from isatin derivatives, by DFT quantum chemical calculations, followed by a SAR and QSAR analysis. Besides, an efficient synthetic protocol and good biological activity profile were highlighted interesting observations about 1H NMR experimental spectra, molecular modeling results and crystallographic data available.
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Bharadwaj KC. Chemoselective and Highly Rate Accelerated Intramolecular Aza-Morita-Baylis-Hillman Reaction. J Org Chem 2018; 83:14498-14506. [PMID: 30441893 DOI: 10.1021/acs.joc.8b02310] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Despite being a very useful C-C bond forming and highly applicative reaction, Morita-Baylis-Hillman (MBH) reaction has been limited by its excessive slow reaction rate, including its intramolecular version. In certain cases, reaction time may even go to weeks and months. A highly chemoselective and rate accelerated intramolecular MBH reaction of just 15 min has been developed. The product dihydroquinoline, being unstable, was converted to an important quinoline framework. In some cases IMBH adducts were isolable, thus confirming the reaction path. Control experiments toward mechanism investigation have been carried out. Use of sodium sulfide has emerged as a rate accelerating catalyst in DMF-EtOH solvent system. Reaction intermediate for IMBH pathway was isolated and characterized. Other aspects such as the application of IMBH adduct for Michael addition and amidation have also been carried out.
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Affiliation(s)
- Kishor Chandra Bharadwaj
- Department of Chemistry, Institute of Science , Banaras Hindu University , Varanasi 221005 , India
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10
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Acrylamide in Rauhut-Currier reaction; intramolecular isomerization of activated alkenes for quinolone synthesis. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Bharadwaj KC. Acryl Activation by Intramolecular Hydrogen Bond: Morita Baylis Hillman Reaction of Acrylamide with Broad Substrate Scope. ChemistrySelect 2017. [DOI: 10.1002/slct.201701081] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kishor Chandra Bharadwaj
- Department of Chemistry, Institute of Science; Banaras Hindu Uniaversity; Varanasi India- 221005
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12
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Gupta T, Bharadwaj KC, Singh RM. Cascade SN2′-SNAr, Elimination, and 1,5-Hydride Shift Reactions by Acetylacetone/Acetoacetic Esters: Synthesis of 9,10-Dihydroacridines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600911] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tanu Gupta
- Department of Chemistry; Centre of Advanced Study; Institute of Science; Banaras Hindu University; Varanasi India
| | - Kishor Chandra Bharadwaj
- Department of Chemistry; Centre of Advanced Study; Institute of Science; Banaras Hindu University; Varanasi India
| | - Radhey M. Singh
- Department of Chemistry; Centre of Advanced Study; Institute of Science; Banaras Hindu University; Varanasi India
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13
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Asthana M, Singh JB, Singh RM. FeCl3·6H2O-catalyzed facile and efficient synthesis of pyrano[4,3-b]quinolines and isochromenes. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2015.12.102] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Tiwari DK, Phanindrudu M, Aravilli VK, Sridhar B, Likhar PR, Tiwari DK. Magnetically recoverable Cu0/Fe3O4catalyzed highly regioselective synthesis of 2,3,4-trisubstituted pyrroles from unactivated terminal alkynes and isocyanides. Chem Commun (Camb) 2016; 52:4675-8. [DOI: 10.1039/c6cc00459h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An efficient, one pot tandem, Cu0/Fe3O4catalyzed highly regioselective synthesis of 2,3,4-trisubstituted pyrroles from unactivated terminal alkynes and isocyanides.
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Affiliation(s)
- Dipak Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
| | - Mandalaparthi Phanindrudu
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
| | - Vinod Kumar Aravilli
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
| | - B. Sridhar
- X-Ray crystallography Center CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
| | - Pravin R. Likhar
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
| | - Dharmendra Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500607
- India
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15
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Singh JB, Chandra Bharadwaj K, Gupta T, Singh RM. Ligand-free palladium-catalyzed facile construction of tetra cyclic dibenzo[b,h][1,6]naphthyridine derivatives: domino sequence of intramolecular C–H bond arylation and oxidation reactions. RSC Adv 2016. [DOI: 10.1039/c6ra00505e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A ligand-free Pd-catalyzed approach has been developed for the synthesis of dibenzo-fused naphthyridines.
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Affiliation(s)
- Jay Bahadur Singh
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Kishor Chandra Bharadwaj
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Tanu Gupta
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Radhey M. Singh
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
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16
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Singh RM, Kumar R, Bharadwaj KC, Gupta T. Pd catalyzed facile synthesis of cyclopenta[b]quinolin-1-one via sequential Sonogashira coupling and annulation. An unusual mode of ring closure, using sulphur as a soft nucleophile. Org Chem Front 2016. [DOI: 10.1039/c6qo00203j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pd mediated one pot sequential Sonogashira coupling followed by annulation using o-alkynyl aldehyde is reported.
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Affiliation(s)
- Radhey M. Singh
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Ritush Kumar
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Kishor Chandra Bharadwaj
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
| | - Tanu Gupta
- Department of Chemistry
- Centre of Advanced Study
- Institute of Science
- Banaras Hindu University
- Varanasi
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17
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Phanindrudu M, Tiwari DK, Sridhar B, Likhar PR, Tiwari DK. Magnetically separable nano-copper catalyzed unprecedented stereoselective synthesis of E-vinyl sulfones from tosylmethyl isocyanide and alkynes: TosMIC as a source of the sulfonyl group. Org Chem Front 2016. [DOI: 10.1039/c6qo00063k] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cu0/Fe3O4 catalyzed stereoselective synthesis of E-vinyl sulfones from tosylmethyl isocyanide and alkynes. TosMIC act as sulfonyl source.
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Affiliation(s)
- Mandalaparthi Phanindrudu
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Dipak Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - B. Sridhar
- X-Ray crystallography Center
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - Pravin R. Likhar
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Dharmendra Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
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Bharadwaj KC, Tiwari DK. Double Morita–Baylis–Hillman (MBH) strategy; an intermolecular and a chemo selective intramolecular MBH reactions for 5/6 substituted, functionalized piperidine unit. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.11.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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19
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Chandra Bharadwaj K. Intramolecular Morita–Baylis–Hillman and Rauhut–Currier reactions. A catalytic and atom economic route for carbocycles and heterocycles. RSC Adv 2015. [DOI: 10.1039/c5ra13611c] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Intramolecular MBH and RC reactions: glorious past and future opportunities.
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