1
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Tsujihara T, Kawano T, Sato K, Inagaki S, Takehara T, Suzuki T. Catalytic Enantioselective Construction of trans-Fused 2,3,3a,4,5,9b-Hexahydro-1H-pyrrolo[3,2-c]quinoline Derivatives by Intramolecular [3+2]-Cycloaddition. HETEROCYCLES 2023. [DOI: 10.3987/com-22-14785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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2
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Király SB, Bényei A, Lisztes E, Bíró T, Tóth BI, Kurtán T. Knoevenagel‐Cyclization Cascade Reactions of Substituted 5,6‐Dihydro‐2
H
‐Pyran Derivatives. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sándor Balázs Király
- Department of Organic Chemistry University of Debrecen P. O. Box 400, 4002 Debrecen Hungary
- Doctoral School of Chemistry University of Debrecen Egyetem tér 1 4032 Debrecen Hungary
| | - Attila Bényei
- Department of Physical Chemistry University of Debrecen 4032 Debrecen Egyetem square 1 Hungary
| | - Erika Lisztes
- Department of Physiology University of Debrecen < postCode/>4032 Debrecen Hungary
| | - Tamás Bíró
- Department of Immunology University of Debrecen postCode/>4032 < Debrecen Hungary
| | - Balázs István Tóth
- Department of Physiology University of Debrecen < postCode/>4032 Debrecen Hungary
| | - Tibor Kurtán
- Department of Organic Chemistry University of Debrecen P. O. Box 400, 4002 Debrecen Hungary
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3
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Bakthadoss M, Vinayagam V. Construction of hybrid polycyclic quinolinobenzo[a]phenazinone architectures using solid-state melt reaction (SSMR). Mol Divers 2021; 25:2447-2458. [PMID: 32367313 DOI: 10.1007/s11030-020-10090-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 04/15/2020] [Indexed: 11/30/2022]
Abstract
An efficient and versatile protocol for the synthesis of hybrid polycyclic quinolinobenzo[a]phenazinones has been developed under SSMR condition via intramolecular domino Knoevenagel-hetero-Diels-Alder reaction involving the generation of two new six membered fused rings and three contiguous stereogenic centers.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry, Pondicherry University, Pondicherry, 605 014, India.
| | - Varathan Vinayagam
- Department of Chemistry, Pondicherry University, Pondicherry, 605 014, India
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4
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Bakthadoss M, Agarwal V, Tadiparthi TR, Mohammad M. Domino ring opening and selective O/S-alkylation of cyclic ethers and thioethers. Mol Divers 2021; 25:2467-2478. [PMID: 32462464 DOI: 10.1007/s11030-020-10105-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 05/13/2020] [Indexed: 10/24/2022]
Abstract
Chemoselective domino ring opening and selective O/S-alkylation of ethers/thioethers over enol C/O alkylation has been observed. Various 2-aryl chromanones/thiochromanones with alkyl/allyl bromides were smoothly converted into the corresponding highly functionalized ethers and thioethers in excellent yields with high selectivity. An unusual, chemoselective domino ring opening and selective ether/thioether O/S-alkylation over. An unusual, chemoselective domino ring opening and selective ether/thioether O/S alkylation over enol C/O alkylation has been observed.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry, Pondicherry University, Pondicherry, 605 014, India.
| | - Vishal Agarwal
- Department of Chemistry, Pondicherry University, Pondicherry, 605 014, India
| | | | - Mushaf Mohammad
- Department of Chemistry, Pondicherry University, Pondicherry, 605 014, India
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5
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Li G, Wang C, Li Y, Shao K, Yu G, Wang S, Guo X, Zhao W, Nakamura H. Zinc(ii)-catalyzed intramolecular hydroarylation-redox cross-dehydrogenative coupling of N-propargylanilines with diverse carbon pronucleophiles: facile access to functionalized tetrahydroquinolines. Chem Commun (Camb) 2020; 56:7333-7336. [PMID: 32483583 DOI: 10.1039/d0cc02921a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Zinc(ii)-catalyzed intramolecular hydroarylation-redox cross-dehydrogenative coupling of N-propargylanilines with two types of carbon pronucleophiles (nitromethane as a sp3 carbon pronucleophile and phenylacetylenes as sp carbon pronucleophiles) proceeded to give the 2-substituted tetrahydroquinolines in good yields with 100% atomic utilization without any additional external oxidants.
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Affiliation(s)
- Guangzhe Li
- Department of Pharmacy, Schoo of Chemical Engineering, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, China.
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6
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Synthesis of isothiosemicarbazones of potential antitumoral activity through a multicomponent reaction involving allylic bromides, carbonyl compounds and thiosemicarbazide. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Green synthesis of pyranopyrazoles via biocatalytic one-pot Knoevenagel condensation–Michael-type addition–heterocyclization cascade in non-aqueous media. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04122-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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8
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Bakthadoss M, Surendar M. Cascade annulation reaction (CAR): highly diastereoselective synthesis of pyranopyrazole scaffolds. RSC Adv 2020; 10:19003-19007. [PMID: 35518344 PMCID: PMC9053953 DOI: 10.1039/d0ra03400b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 05/11/2020] [Indexed: 12/26/2022] Open
Abstract
An unprecedented domino protocol for the novel synthesis of highly diverse and functionalized tetrahydro pyranopyrazole scaffolds using chalcone epoxide has been reported for the first time. This synthetic protocol generates three consecutive stereogenic centres in a highly diastereoselective manner with the formation of vicinal diol and a quaternary carbon centre. A wide range of substrates were utilized for the scope of this methodology and provided very good yields of pyranopyrazoles. The pyranopyrazoles were also transformed into densely functionalized tetrasubstituted olefins. An unprecedented domino protocol for the novel synthesis of highly diverse and functionalized tetrahydro pyranopyrazole scaffolds using chalcone epoxide has been reported.![]()
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Affiliation(s)
| | - Manickam Surendar
- Department of Chemistry
- Pondicherry University
- Pondicherry 605014
- India
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9
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Bakthadoss M, Devaraj A, Mushaf M. Assembly of Highly Functionalized Chromenopyranpyrazoles
via
Multicomponent Quadruple Domino Reaction (MCQDR). ChemistrySelect 2019. [DOI: 10.1002/slct.201902727] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | | | - Mohammad Mushaf
- Pondicherry University, R.V. Nagar Kalapet Puducherry 605014
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10
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Bakthadoss M, Vinayagam V, Agarwal V, Sharada DS. Three Component, One‐Pot Synthesis of Multifunctional Quinolinopyranpyrazoles
via
Catalyst‐Free Multicomponent Reaction. ChemistrySelect 2019. [DOI: 10.1002/slct.201901806] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
| | - Varathan Vinayagam
- Department of Organic ChemistryUniversity of MadrasGuindy Campus Chennai 600025, Tamilnadu India
| | - Vishal Agarwal
- Department of ChemistryPondicherry University Pondicherry – 605014 India
| | - Duddu S. Sharada
- Department of ChemistryIndian Institute of Technology Hyderabad Kandi- 502285, Sangareddy, Telangana India
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11
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Bakthadoss M, Jayakumar S, Raman S, Devaraj A, Sharada DS. A novel multicomponent quadruple/double quadruple domino reaction: highly efficient synthesis of polyheterocyclic architectures. Org Biomol Chem 2019; 17:3884-3893. [PMID: 30574986 DOI: 10.1039/c8ob02970a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel multicomponent quadruple domino reaction (MCQDR) for the assembly of structurally complex molecular architectures via the formation of three rings and three contiguous stereogenic centers has been accomplished with high regio- and diastereoselectivity. Solvents, catalysts and work-up were not required to obtain the target molecules. In addition, this new protocol is also extended for the multicomponent double quadruple domino reaction (MCDQDR) to create novel polyheterocyclic architectures in an orthogonal manner.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry, Pondicherry University, Puducherry - 605 014, India.
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12
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Muthukrishnan I, Sridharan V, Menéndez JC. Progress in the Chemistry of Tetrahydroquinolines. Chem Rev 2019; 119:5057-5191. [PMID: 30963764 DOI: 10.1021/acs.chemrev.8b00567] [Citation(s) in RCA: 238] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tetrahydroquinoline is one of the most important simple nitrogen heterocycles, being widespread in nature and present in a broad variety of pharmacologically active compounds. This Review summarizes the progress achieved in the chemistry of tetrahydroquinolines, with emphasis on their synthesis, during the period from mid-2010 to early 2018.
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Affiliation(s)
- Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla) , District-Samba, Jammu 181143 , Jammu and Kashmir , India
| | - J Carlos Menéndez
- Unidad de Química Orgańica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia , Universidad Complutense , 28040 Madrid , Spain
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13
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Bakthadoss M, Raman S, Mushaf M. A rearrangement involving a solid-state melt reaction for the synthesis of multifunctional tetrasubstituted olefins. Org Biomol Chem 2019; 17:4767-4773. [DOI: 10.1039/c9ob00639g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new catalyst- and solvent-free intramolecular rearrangement sequence leading towards benzimidazole-tethered tetrasubstituted olefins through a solid-state melt reaction (SSMR).
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Affiliation(s)
| | - Selvakumar Raman
- Department of Organic Chemistry
- University of Madras
- Chennai-600 025
- India
| | - Mohammad Mushaf
- Department of Chemistry
- Pondicherry University
- Pondicherry - 605 014
- India
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14
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Bakthadoss M, Kumar PV. Ruthenium‐Catalyzed Site‐selective Enone Carbonyl Directed
ortho
‐C−H Activation of Aromatics and Heteroaromatics with Alkenes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800376] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Polu Vijay Kumar
- Department of ChemistryPondicherry University Pondicherry - 605014 India
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15
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Bakthadoss M, Mushaf M. A distal vinyl shift (DVS) through quadruple domino reaction: synthesis of N-vinyl benzoheterocyclic scaffolds. RSC Adv 2018; 8:12152-12156. [PMID: 35539421 PMCID: PMC9079281 DOI: 10.1039/c8ra01478g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 03/21/2018] [Indexed: 12/17/2022] Open
Abstract
An unprecedented Distal Vinyl Shift (DVS) through quadruple domino reaction has been disclosed via the synthesis of N-vinyl benzoheterocyclic scaffolds.
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Affiliation(s)
| | - Mohammad Mushaf
- Department of Chemistry
- Pondicherry University
- Pondicherry
- India
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16
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Bakthadoss M, Kumar PV, Reddy TT, Sharada DS. Solvent and catalyst free ring expansion of indoles: a simple synthesis of highly functionalized benzazepines. Org Biomol Chem 2018; 16:8160-8168. [DOI: 10.1039/c8ob01825a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly functionalized benzazepines have been synthesized from indoles via ring expansion. Ring contraction of benzazepines to indole derivatives has also been acheived in excellent yields.
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Affiliation(s)
| | - Polu Vijay Kumar
- Department of Chemistry
- Pondicherry University
- Pondicherry – 605 014
- India
| | | | - Duddu S. Sharada
- Department of Chemistry
- Indian Institute of Technology
- Hyderabad, Kandi
- India
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17
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Bakthadoss M, Meegada SK, Surendar M. Triple domino reaction for the synthesis of pyrazole/indoline linked chromenes. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.12.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Srinivasulu V, Reddy A, Mazitschek R, Lukens AK, Wirth DF, Li L, Naumov P, O'Connor MJ, Al-Tel TH. Intramolecular Diaza-Diels-Alder Protocol: A New Diastereoselective and Modular One-Step Synthesis of Constrained Polycyclic Frameworks. Chemistry 2017; 23:4137-4148. [PMID: 27997727 DOI: 10.1002/chem.201605231] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 12/18/2016] [Indexed: 12/29/2022]
Abstract
Phenotype-based screening of diverse compound collections generated by privileged substructure-based diversity-oriented synthesis (pDOS) is considered one of the prominent approaches in the discovery of novel drug leads. However, one key challenge that remains is the development of efficient and modular synthetic routes toward the facile access of privileged small-molecule libraries with skeletal and stereochemical complexity and drug-like properties. In this regard, a novel and diverse one-pot procedure for the diastereoselective synthesis of privileged polycyclic benzopyrans and benzoxepines is described herein. These unexplored chemotypes were accessed by utilizing an acid-mediated diaza-Diels-Alder reaction of 2-allyloxy- and/or homoallyloxy benzaldehyde with 2-aminoazine building blocks. Profiling of representative analogues against blood-stage Plasmodium falciparum parasites identified three lead candidates with low micromolar antimalarial activity.
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Affiliation(s)
- Vunnam Srinivasulu
- Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, UAE
| | - Amarnath Reddy
- Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, UAE
| | - Ralph Mazitschek
- Center for Systems Biology, Massachusetts General Hospital, Harvard Medical School, 185 Cambridge Street, Boston, MA, 02114, USA.,Department of Immunology and Infectious Disease, Harvard T. H. Chan School of Public Health, Boston, MA, 02115, USA.,Broad Institute of Harvard and, Massachusetts Institute of Technology, Cambridge, MA, 02142, USA
| | - Amanda K Lukens
- Department of Immunology and Infectious Disease, Harvard T. H. Chan School of Public Health, Boston, MA, 02115, USA.,Broad Institute of Harvard and, Massachusetts Institute of Technology, Cambridge, MA, 02142, USA
| | - Dyann F Wirth
- Department of Immunology and Infectious Disease, Harvard T. H. Chan School of Public Health, Boston, MA, 02115, USA.,Broad Institute of Harvard and, Massachusetts Institute of Technology, Cambridge, MA, 02142, USA
| | - Liang Li
- Core Technologies Platform, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
| | - Panče Naumov
- Department of Chemistry, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
| | - Matthew John O'Connor
- Core Technologies Platform, New York University Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, UAE
| | - Taleb H Al-Tel
- Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, UAE.,College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, UAE
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19
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Efficient access to novel tetra- and pentacyclic dihydroquinolin-2-ones by catalyst-free domino Knöevenagel hetero-Diels–Alder reactions from N-(2-formylphenyl)-N-methylcinnamamides and cyclic 1,3-dicarbonyls in water. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-016-0968-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Dommaraju Y, Borthakur S, Prajapati D. Rapid Access to Indoline Spiropyran Scaffolds by Domino-Knoevenagel/oxa-Diels-Alder (DKODA) Reaction at Room Temperature. ChemistrySelect 2016. [DOI: 10.1002/slct.201601707] [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)
- Yuvaraj Dommaraju
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
| | - Somadrita Borthakur
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
| | - Dipak Prajapati
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
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21
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Sharada DS, Shinde AH, Patel SM, Vidyacharan S. Scaffold Diversity through a Branching Double-Annulation Cascade Strategy: Iminium-Induced One-Pot Synthesis of Diverse Fused Tetrahydroisoquinoline Scaffolds. J Org Chem 2016; 81:6463-71. [DOI: 10.1021/acs.joc.6b01096] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Duddu S. Sharada
- Department of Chemistry, Indian Institute of Technology Hyderabad (IITH), Kandi, Sangareddy, Telangana 502 285, India
| | - Anand H. Shinde
- Department of Chemistry, Indian Institute of Technology Hyderabad (IITH), Kandi, Sangareddy, Telangana 502 285, India
| | - Srilaxmi M. Patel
- Department of Chemistry, Indian Institute of Technology Hyderabad (IITH), Kandi, Sangareddy, Telangana 502 285, India
| | - Shinde Vidyacharan
- Department of Chemistry, Indian Institute of Technology Hyderabad (IITH), Kandi, Sangareddy, Telangana 502 285, India
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22
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Bakthadoss M, Kannan D, Srinivasan J, Vinayagam V. Highly regio- and diastereo-selective synthesis of novel tri- and tetra-cyclic perhydroquinoline architectures via an intramolecular [3 + 2] cycloaddition reaction. Org Biomol Chem 2016; 13:2870-4. [PMID: 25620236 DOI: 10.1039/c4ob02203c] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile and efficient synthetic protocol was established for the construction of novel tri- and tetra-cyclic pyrrolo/pyrrolizinoquinoline architectures via the in situ formation of azomethine ylide followed by an intramolecular [3 + 2] cycloaddition reaction strategy. This protocol leads to the creation of two/three new rings and three/four contiguous stereocentres, in which one of them is a tetra-substituted carbon center, in a highly diastereoselective fashion with excellent yields.
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Affiliation(s)
- M Bakthadoss
- Department of Chemistry, Pondicherry University, Pondicherry - 605 014, India.
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23
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Bakthadoss M, Selvakumar R. One-Pot Synthesis of Benzothiazole-Tethered Chromanones/Coumarins via Claisen Rearrangement Using the Solid State Melt Reaction. J Org Chem 2016; 81:3391-9. [DOI: 10.1021/acs.joc.5b02920] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - Raman Selvakumar
- Department
of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, Tamilnadu, India
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24
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Bakthadoss M, Sivakumar N, Devaraj A. Synthesis of benzoxepinopyrrolidines/spiropyrrolidines via oxa-Pictet–Spengler and [3+2] cycloaddition reactions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.07.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Diastereoselective construction of highly functionalized tetrahydroquinolinoisoxazole scaffolds via intramolecular nitrone cycloaddition. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.05.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Bakthadoss M, Murugan G, Srinivasan J. Synthesis of functionalized cyclohexenols via a domino Michael addition–Dieckmann cyclization–isomerization reaction sequence. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Bakthadoss M, Kannan D, Sivakumar N, Malathi P, Manikandan V. Stereoselective construction of functionalized tetracyclic and pentacyclic coumarinopyranpyrazole/pyrimidinedione/coumarin scaffolds using a solid-state melt reaction. Org Biomol Chem 2015; 13:5597-601. [PMID: 25913710 DOI: 10.1039/c5ob00442j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An assembly of tetra / pentacyclic hybrid scaffolds have been synthesized for the first time using a solid-state melt reaction in a stereoselective fashion with excellent yields.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry
- Pondicherry University
- Pondicherry 605 014
- India
- Department of Organic Chemistry
| | - Damodharan Kannan
- Department of Organic Chemistry
- University of Madras
- Chennai 600025
- India
| | | | - Palani Malathi
- Department of Organic Chemistry
- University of Madras
- Chennai 600025
- India
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28
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Bakthadoss M, Vinayagam V. A novel protocol for the facile construction of tetrahydroquinoline fused tricyclic frameworks via an intramolecular 1,3-dipolar nitrile oxide cycloaddition reaction. Org Biomol Chem 2015; 13:10007-14. [DOI: 10.1039/c5ob01060h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient method towards the synthesis of quinoline fused tricyclic compounds involving an intramolecular 1,3-dipolar nitrile oxide cycloaddition reaction utilizing Baylis–Hillman derivatives in good yields has been described for the first time.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry
- Pondicherry University
- Pondicherry-605 014
- India
- Department of Organic Chemistry
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29
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Bakthadoss M, Srinivasan J. A facile synthesis of isoxazolo[3,4-a]pyrrolizine and isoxazolo[4,3-c]pyridine derivatives via intramolecular nitrone cycloaddition reaction. RSC Adv 2015. [DOI: 10.1039/c5ra10371a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Isoxazolo [3,4-a]pyrrolizine and isoxazolo[4,3-c]pyridine are formed by a facile and efficient intramolecular [3 + 2] nitrone cycloaddition, forming two new rings and three contiguous stereocentres with high diastereoselectivity and good yields.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry
- Pondicherry University
- Pondicherry-605014
- India
- Department of Organic Chemistry
| | - Jayakumar Srinivasan
- Department of Organic Chemistry
- University of Madras
- Guindy Campus
- Chennai-600025
- India
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31
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Bakthadoss M, Sivakumar N, Devaraj A, Kumar PV. Synthesis of highly diversified 1,2,3-triazole derivatives via domino [3 + 2] azide cycloaddition and denitration reaction sequence. RSC Adv 2015. [DOI: 10.1039/c5ra14195h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of 1,2,3-triazoles via domino azide cycloaddition and denitration reaction sequence under catalyst free conditions is described. Sodium azide treatment of Baylis–Hillman adducts and their cyclic derivatives from nitro olefins gave the triazoles in excellent yield.
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Affiliation(s)
- Manickam Bakthadoss
- Department of Chemistry
- Pondicherry University
- Pondicherry–605 014
- India
- Department of Organic Chemistry
| | | | | | - Polu Vijay Kumar
- Department of Chemistry
- Pondicherry University
- Pondicherry–605 014
- India
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32
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Nadendla EK, Jagadeesan G, Kannan D, Bakthadoss M, Gunasekaran K. Crystal structure of methyl 1-methyl-3,5-diphenyl-7-tosyl-3,6,7,11b-tetra-hydro-pyrazolo-[4',3':5,6]pyrano[3,4-c]quinoline-5a(5H)-carboxyl-ate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o1295-6. [PMID: 25553055 PMCID: PMC4257454 DOI: 10.1107/s160053681402515x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 11/17/2014] [Indexed: 11/10/2022]
Abstract
In the title compound, C35H31N3O5S, the piperidine ring adopts an envelope conformation, with the methine C atom as the flap, and the pyran ring adopts a sofa conformation. The mean planes of these two rings are almost normal to one another, making a dihedral angle of 85.96 (5)°. The two phenyl rings, one attached to the pyrazole ring and the other to the pyran ring, are inclined to one another by 65.41 (11)°. They are inclined to the mean planes of the rings to which they are attached by 12.59 (11) and 70.09 (9)°, respectively. There is an intra-molecular C-H⋯π inter-action involving the tosyl-ate methyl group and the phenyl ring attached to the pyrazole ring. In the crystal, mol-ecules are linked by C-H⋯π inter-actions, forming ribbons parallel to (10-2). The ribbons are linked by slipped parallel π-π inter-actions involving inversion-related pyrazole rings [inter-centroid distance = 3.672 (2) Å], forming slabs parallel to (001). A preliminary report of this structure has been published [Bakthadoss et al. (2014 ▶). Eur. J. Org. Chem. pp. 1505-1513].
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Affiliation(s)
- Eswar Kumar Nadendla
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India
| | - G Jagadeesan
- Department of Physics, Presidency College, Chennai 600 005, India
| | - D Kannan
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India
| | - Mannickam Bakthadoss
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India
| | - K Gunasekaran
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India
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An efficient protocol for the synthesis of benzoheterocyclic compounds via solid-state melt reaction (SSMR). Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.084] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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