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Roy D, Tharra P, Baire B. An approach to functionalized carbazoles from Z-enoate propargylic alcohols. A unified total synthesis of N-Me-carazostatin, N-Me-carbazoquinocin C and N-Me-lipocarbazole A4. Chem Commun (Camb) 2022; 58:10210-10213. [PMID: 36000534 DOI: 10.1039/d2cc03526j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Development of an acid catalyzed, intramolecular benzannulation of indoles for the synthesis of functionalized carbazoles has been reported. The indole appended Z-enoate propargylic alcohols have been employed. The N-EDG-indoles involve the 5-exo-dig cyclization followed by 1,2-migration to give the carbazole-butenoates, whereas the N-EWG-indoles undergo the Z-enoate assisted Meyer-Schuster rearrangement to give the dihydrocarbazole-4-oxo-butanoates. Utilizing one of the 2-methyl-carbazole-butyraldehyde (obtained from the corresponding carbazole-butanoate) as the key intermediate, we have developed a simple approach for an efficient synthesis of N-Me-carazostatin, N-Me-carbazoquinocin C and N-Me-lipocarbazole A4.
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Affiliation(s)
- Debayan Roy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - Prabhakararao Tharra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
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2
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Bovonsombat P, Sophanpanichkul P, Losuwanakul S. Electrophilic halogenations of propargyl alcohols: paths to α-haloenones, β-haloenones and mixed β,β-dihaloenones. RSC Adv 2022; 12:22678-22694. [PMID: 36105984 PMCID: PMC9373005 DOI: 10.1039/d2ra03540e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/02/2022] [Indexed: 11/21/2022] Open
Abstract
The Meyer–Schuster rearrangement of propargyl alcohols or alkynols leading to α,β-unsaturated carbonyl compounds is well known. Yet, electrophilic halogenations of the same alkynols and their alkoxy, ester and halo derivatives are inconspicuous. This review on the halogenation reactions of propargyl alcohols and derivatives intends to give a perspective from its humble direct halogenation beginning to the present involving metal catalysis. The halogenation products of propargyl alcohols include α-fluoroenones, α-chloroenones, α-bromoenones and α-iodoenones, as well as β-haloenones and symmetrical and mixed β,β-dihaloenones. They are, in essence, tri and tetrasubstituted alkenes carrying halo-functionalization at the α- or β-carbon. This is a potential stepping stone for further construction towards challenging substituted alkenones via Pd-catalysed coupling reactions. This review highlights the development of α-haloenone, β-haloenone and mixed β,β-dihaloenone formations from propargyl alcohols via direct electrophilic halogenations and metal catalysed-halonium interception rearrangements.![]()
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Affiliation(s)
- Pakorn Bovonsombat
- Mahidol University International College, Mahidol University, Salaya, Nakorn Pathom, Thailand
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3
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Baire B, Yadav B. TfOH catalysed domino-double annulation of arenes with propargylic alcohols: a unified approach to indene polycyclic systems. Chem Commun (Camb) 2021; 57:12796-12799. [PMID: 34782905 DOI: 10.1039/d1cc05253e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The design and development of a TfOH catalysed domino strategy for the double annulation of arenes with propargylic alcohols for the rapid generation of indene based polycyclic systems is reported. The dehydration, intramolecular 6-endo-dig hydroarylation, and cationic cyclization were consecutively promoted by TfOH. The key features of this strategy are the formation of two C-C bonds, unified access to indene polycyclic systems, excellent yields (up to 95%), high atom economy (>90%), an operationally simple procedure, and water being the only byproduct. By extending this strategy, a two-step synthesis of the pentacyclic systems of hypoxylonol A (43% overall yield from α-tetralone), daldinone A (63% overall yield from β-tetralone) and spiro-tetracyclic framework of incarviatone A has also been achieved.
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Affiliation(s)
- Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, Tamilnadu, India.
| | - Bhavna Yadav
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, Tamilnadu, India.
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Roy D, Tharra P, Baire B. An Approach for the Generation of γ-Propenylidene-γ-butenolides and Application to the Total Synthesis of Rubrolides. Org Lett 2021; 23:5605-5610. [PMID: 34259007 DOI: 10.1021/acs.orglett.1c01529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Design and synthesis of a new class of γ-butenolides, viz. β-aryl-γ-propenylidene-γ-butenolides, have been reported from β-aryl-Z-enoate propargylic alcohols in the presence of acid. Isolation of β-aryl-γ-propenylidene-γ-butenolides and their O18-isomer confirmed the intermediacy of the allenyl-lactonium ion as well as the cyclic-hemiacetal during the proposed mechanism. By utilizing the β-aryl-γ-methylenecyclohexenylidene-γ-butenolides as starting materials, a highly stereoselective and efficient approach has been developed for the syntheses of frameworks of rubrolide natural products. This strategy was further extended for the total synthesis of rubrolide E.
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Affiliation(s)
- Debayan Roy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
| | - Prabhakararao Tharra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
| | - Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamilnadu, India
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Song L, Ni D, Han W, Tang J, Yang F, Liu S. FeTPPCl/FeCl 3 Co-Catalyzed One-Pot Green Synthesis of α-Diaryl-β-alkynol Derivatives via Propargylic Carbocation Chemistry. J Org Chem 2021; 86:9306-9316. [PMID: 34228462 DOI: 10.1021/acs.joc.1c00474] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A green and highly efficient one-pot method for α-diaryl-β-alkynol derivatives in water at room temperature was developed using the cocatalysis of a Lewis acid and meso-tetraphenylporphyrin iron(III) chloride (FeTPPCl). The unprecedented transformation was promoted by a modulation of the charge properties of propargylic carbocation chemistry and the use of an in situ-generated oxonium ylide as a matching nucleophile. The reaction was performed in water at room temperature with a highly step-economic manipulation in good to excellent yields and with a broad substrate scope. Water also acts as the third reactant for the one-pot transformation. Notably, the FeTPPCl catalyst can be directly reused four times with a slight discount in yields.
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Affiliation(s)
- Longlong Song
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Dan Ni
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Wangyujing Han
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Jie Tang
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Fan Yang
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Shunying Liu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Chemical Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
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Roy D, Baire B. Evidence for Atropisomerism in Polycyclic γ-Butenolides: Synthesis, Scope, and Spectroscopic Studies. Chemistry 2021; 27:4009-4015. [PMID: 33378093 DOI: 10.1002/chem.202005174] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/22/2020] [Indexed: 12/22/2022]
Abstract
Design and development of a domino cyclative approach for the synthesis of new polycyclic γ-butenolides from β-aryl-Z-enoate propargylic alcohols, through the interception of an intermediate of the Z-enoate-assisted Meyer-Schuster rearrangement, has been reported. A systematic NMR analysis of various derivatives of this class revealed and supported the potential atropisomerism associated with them. These molecules represent first examples of butenolide ring-based atropisomeric compounds in organic chemistry. The synthetic process involves a synchronous construction of both rings with concurrent creation of the potential stereogenic rotational axis.
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Affiliation(s)
- Debayan Roy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, India
| | - Beeraiah Baire
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, India
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Justaud F, Hachem A, Grée R. Recent Developments in the Meyer‐Schuster Rearrangement. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001494] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Frédéric Justaud
- Univ Rennes CNRS (Institut for Chemical Sciences in Rennes), UMR 6226 35000 Rennes France
| | - Ali Hachem
- Lebanese University Faculty of Sciences (I) Laboratory for Medidinal Chemistry and Natural Products and PRASE-EDST Hadath Lebanon
| | - René Grée
- Univ Rennes CNRS (Institut for Chemical Sciences in Rennes), UMR 6226 35000 Rennes France
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Trost BM, Tracy JS. Catalytically Generated Vanadium Enolates Formed via Interruption of the Meyer-Schuster Rearrangement as Useful Reactive Intermediates. Acc Chem Res 2020; 53:1568-1579. [PMID: 32692147 DOI: 10.1021/acs.accounts.0c00285] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Enolate chemistry is one of the most fundamental strategies for the formation of carbon-carbon and carbon-heteroatom bonds. Classically, this has been accomplished through the use of stoichiometric quantities of strong base and cryogenic reaction temperatures. However, these techniques present issues related to enolate regioselectivity and functional group tolerance. While more modern methods utilizing stoichiometric activating agents have overcome some of these limitations, these processes add additional steps and suffer from poor atom economy. While certain classes of highly acidic nucleophiles have enabled the development of elegant and general catalytic solutions to address all of these limitations, functionalizing less acidic nucleophiles remains difficult.To overcome these challenges, we developed an alternative general approach for the formation and subsequent functionalization of metal enolates that leverages catalytic amounts of Lewis acid and entirely avoids the need for exogenous base or stoichiometric additives. To do so, we re-engineered the classical Meyer-Schuster rearrangement, which normally converts propargylic alcohols into α,β-unsaturated carbonyl compounds. By careful control of reaction conditions and by selection of an appropriate vanadium-oxo catalyst, the transient metal enolates formed via the 1,3-transposition of propargylic or allenylic alcohols can be guided away from simple protonation reaction pathways and toward more synthetically productive carbon-carbon, carbon-halogen, and carbon-nitrogen bond-forming processes.By utilizing readily available propargylic and allenylic alcohols as our starting materials and relying on a catalytic 1,3-transposition to generate metal enolates in situ, all issues related to the regioselectivity of enolate formation are resolved. Likewise, utilization of a simple isomerization for enolate formation results in a highly efficient process that can be 100% atom economical. The mild reaction conditions employed also allow for remarkable chemoselectivity. Functional groups not typically conducive to enolate chemistry, such as alkynyl ketones, methyl ketones, free alcohols, and primary alkyl halides, are all well tolerated. Finally, by varying the substitution patterns of the alcohol starting materials, enolates of ketones, esters, and even amides are all accessible.Utilizing this strategy starting from propargylic alcohols, we have developed functionalization reactions that produce highly substituted and geometrically defined α-functionalized α,β-unsaturated carbonyl compounds. Such processes include aldol, Mannich, and electrophilic halogenation reactions, as well as dual catalytic reactions wherein catalytically generated vanadium enolates are trapped with catalytically generated palladium π-allyl electrophiles. In the case of allenylic alcohols, we have developed complementary aldol, Mannich, halogenation, and dual catalytic processes to generate α'-functionalized α,β-unsaturated carbonyl products.The results described in this work showcase the power and generality of our alternative approach to enolate chemistry. Additionally, we point out unaddressed challenges in the field and invite other groups to help innovate in these areas.
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Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
| | - Jacob S. Tracy
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
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Gandhi S, Baire B. Fe(III)‐Catalyzed, Cyclizative Coupling between 2‐Alkynylbenzoates and Carbinols: Rapid Generation of Polycyclic Isocoumarins and Phthalides and Mechanistic Study. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000313] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Soniya Gandhi
- Department of ChemistryInstitute of Technology Madras Chennai 600036
| | - Beeraiah Baire
- Department of ChemistryInstitute of Technology Madras Chennai 600036
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10
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Naveen N, Ramesh G, Balamurugan R. Silver‐Catalyzed Synthesis of Enones/α‐Iodoenones from Tertiary Propargyl Alcohols. ChemistrySelect 2019. [DOI: 10.1002/slct.201903568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Naganaboina Naveen
- School of ChemistryUniversity of Hyderabad, Gachibowli Hyderabad 500046 India
| | - Golla Ramesh
- School of ChemistryUniversity of Hyderabad, Gachibowli Hyderabad 500046 India
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11
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Sadhukhan S, Baire B. Formal Halo‐Meyer–Schuster Rearrangement of Propargylic Acetates through a Novel Intermediate and an Unexampled Mechanistic Pathway. Chemistry 2019; 25:9816-9820. [DOI: 10.1002/chem.201901856] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 05/29/2019] [Indexed: 01/02/2023]
Affiliation(s)
- Santu Sadhukhan
- Department of ChemistryIndian Institute of Technology Madras Chennai Tamilnadu 600036 India
| | - Beeraiah Baire
- Department of ChemistryIndian Institute of Technology Madras Chennai Tamilnadu 600036 India
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12
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Chinta BS, Gandhi S, Baire B. Acid catalysed rearrangement of isobenzofurans to angularly fused phthalides. Org Biomol Chem 2019; 17:4715-4719. [PMID: 31032835 DOI: 10.1039/c9ob00708c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An acid catalysed, cascade process for the construction of angularly fused polycyclic phthalides from isobenzofurans under transition metal free conditions has been reported. This process is very general for diverse gem-disubstituted isobenzofuran substrates. Control experiments supported the mechanism as the nucleophilic attack of the carboxylate onto the acid activated furan ring for the simultaneous ring closing-ring opening cascade followed by dehydration. This method serves as a greener alternative for the synthesis of angularly fused polycyclic phthalides.
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13
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Trost BM, Tracy JS. Vanadium-Catalyzed Synthesis of Geometrically Defined Acyclic Tri- and Tetrasubstituted Olefins from Propargyl Alcohols. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04567] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
| | - Jacob S. Tracy
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
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14
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Li R, Jin F, Song XR, Yang T, Ding H, Yang R, Xiao Q, Liang YM. Acid-promoted cyclization of 2-propynolphenols leading to 4-tosyloxy-2H-chromenes. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.12.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Tiwari V, Singh A. Expeditious Conversion of Iodoallenes to Iodoenals Mediated by Sodium Azide and Iodine. ChemistrySelect 2018. [DOI: 10.1002/slct.201801121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vibha Tiwari
- Department of ChemistryIndian Institute of Technology Kanpur Kanpur-208016, Uttar Pradesh India
| | - Anand Singh
- Department of ChemistryIndian Institute of Technology Kanpur Kanpur-208016, Uttar Pradesh India
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16
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Roy D, Tharra P, Baire B. Intercepted Meyer-Schuster Rearrangements in Organic Synthesis. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800089] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Debayan Roy
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 Tamil Nadu India
| | - Prabhakararao Tharra
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 Tamil Nadu India
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 Tamil Nadu India
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17
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Gandhi S, Baire B. Calcium(II) Catalyzed Cycloisomerization of cis
-6-Hydroxy/(Acyloxy)hex-2-en-4-ynals to 2-Acyl- and 2-(Acyloxyalkenyl)furans. ChemistrySelect 2018. [DOI: 10.1002/slct.201800618] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Soniya Gandhi
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu INDIA-600036
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu INDIA-600036
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Chinta BS, Sanapa H, Vasikarla KP, Baire B. Highly regioselective, electrophile induced cyclizations of 2-(prop-1-ynyl)benzamides. Org Biomol Chem 2018; 16:3947-3951. [DOI: 10.1039/c8ob00434j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We report an electrophile promoted, highly regioselective (∼100%) synthesis of 5-membered haloimidiates from 2-(1-alkynyl)benzamides under metal free conditions.
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Affiliation(s)
| | | | | | - Beeraiah Baire
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai-600036
- India
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Sadhukhan S, Baire B. Lewis Basicity of Water for a Selective Monodehalogenation of α,α-Dihalo Ketones to α-Halo Ketones and Mechanistic Study. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701233] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Santu Sadhukhan
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
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Sadhukhan S, Baire B. An Expeditious Approach to α,α-Dihalo-α′-acetoxyketones from Propargylic Acetates. ChemistrySelect 2017. [DOI: 10.1002/slct.201701398] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Santu Sadhukhan
- Department of Chemistry; Indian Institute of Technology Madras; Chennai- 600036 INDIA
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras; Chennai- 600036 INDIA
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21
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Tharra P, Baire B. A coherent study on the Z-enoate assisted Meyer–Schuster rearrangement. Org Biomol Chem 2017. [DOI: 10.1039/c7ob01221g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The impact of temperature, solvent, concentration of the counter ion and the nature of the arene nucleophile on the Z-enoate assisted Meyer–Schuster rearrangement of propargylic alcohols was studied.
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Affiliation(s)
| | - Beeraiah Baire
- Department of Chemistry
- Institute of Technology Madras
- Chennai-600036
- India
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