1
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Guo SM, Xu P, Studer A. Meta-Selective Copper-Catalyzed C-H Arylation of Pyridines and Isoquinolines through Dearomatized Intermediates. Angew Chem Int Ed Engl 2024; 63:e202405385. [PMID: 38634294 DOI: 10.1002/anie.202405385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 04/16/2024] [Accepted: 04/17/2024] [Indexed: 04/19/2024]
Abstract
C(sp2)-H functionalization offers an efficient strategy for the synthesis of various elaborated N-containing heteroarenes. Along these lines, oxazino pyridines that can be readily prepared from pyridines, have been introduced as powerful substrates in radical- and ionic-mediated meta-C-H functionalization. However, the regioselective meta-C-H arylation of pyridines remains a great challenge. Herein, a copper-catalyzed meta-selective C-H arylation of pyridines and isoquinolines through bench-stable dearomatized intermediates is reported. Electrophilic aryl-Cu(III) species, generated from readily accessible aryl I(III) reagents, enable the efficient meta-arylation of a broad range of pyridines and isoquinolines. The method also allows the meta-selective alkenylation of these heteroarenes using the corresponding alkenyl I(III)-reagents. Late-stage arylation of drug-derived pyridines and larger-scale experiments demonstrate the potential of this synthetic methodology.
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Affiliation(s)
- Shu-Min Guo
- Organisch-Chemisches Institut, Universität Münster, 48149, Münster, Germany
| | - Pengwei Xu
- Organisch-Chemisches Institut, Universität Münster, 48149, Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Universität Münster, 48149, Münster, Germany
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2
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Aravindan N, Jeganmohan M. One-Pot Synthesis of Benzo[ c]phenanthridine Alkaloids from 7-Azabenzonorbornadienes and Aryl Nitrones. Org Lett 2023. [PMID: 37200493 DOI: 10.1021/acs.orglett.3c01192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
An efficient synthesis of benzo[c]phenanthridine alkaloids via a synergistic combination of C-C bond formation and a cycloaromatization reaction is described. Aryl nitrones react with 7-azabenzonorbornadienes in the presence of a Rh(III) catalyst, providing pharmaceutically useful benzo[c]phenanthridine derivatives in good to moderate yields. Using this methodology, highly useful alkaloids such as norfagaronine, norchelerythrine, decarine, norsanguinarine, and nornitidine were prepared in a single step.
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Affiliation(s)
- Narasingan Aravindan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
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3
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Das A, Sah P, Saraogi I. Dual Role of a Fluorescent Small Molecule as a Sensor and Inhibitor of Protein Fibrillation. Chem Asian J 2023; 18:e202201309. [PMID: 36594929 DOI: 10.1002/asia.202201309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Accepted: 01/03/2023] [Indexed: 01/04/2023]
Abstract
Ordered fibrillar aggregates of proteins, called amyloids, are prevalent in several diseases like Alzheimer's, Parkinson's, and Type II diabetes. The key challenge in the treatment of such diseases is the early detection of protein fibrillation and its effective inhibition using extrinsic agents. Thus, molecules that can both detect and inhibit protein fibril formation have great diagnostic and therapeutic utility. Using insulin as a model protein, we report the dual action of an isoquinoline based molecule, named MK14 which detects and prevents insulin fibrillation. Dose dependent inhibition of insulin fibrillation by MK14 gave an IC50 value of 9 μM, and mechanistic investigations suggested that MK14 prevented the elongation of fibrils by interacting with pre-fibrillar intermediates. The fluorescence of MK14 enhanced upon binding to fibrils of insulin as well as those of α-synuclein, the protein involved in Parkinson's disease. MK14 is an environmentally sensitive fluorophore, which could also detect amorphous aggregates of insulin. The dual nature of MK14 as an inhibitor and detector of protein fibrillation makes it an attractive lead compound for monitoring and disrupting protein amyloidogenesis.
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Affiliation(s)
- Anirban Das
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, MP, India
| | - Pooja Sah
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, MP, India
| | - Ishu Saraogi
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, MP, India.,Department of Biological Sciences, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, MP, India
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4
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Kshirsagar N, Sonawane R, Pathan S, Kamble G, Pal Singh G. A Review on Synthetic Approaches of Phenanthridine. LETT ORG CHEM 2022. [DOI: 10.2174/1570178618666210218211424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
The phenanthridine family is widely found in medicinal chemistry and material science because
of the biological activity and its presence in a variety of significant natural products and synthetic
dye stuffs. The phenanthridine has many clinical applications, for e.g., being used as an anticancer agent,
possessing antibacterial, antiprotozoal, pharmaceutical, and optoelectronic properties. Many methods
have been reported for the synthesis of phenanthridine and phenanthridine alkaloids, such as Pd catalyzed
C-C bond formation, a reaction involving C-H activation, radical, microwave-assisted, transition
metal-catalyzed, one-pot cascade, benzyne mediated, photochemical, hypervalent iodine promoted methods,
etc. Here, we have summarized the literature data from 2014 to the present concerning novel or
improved synthetic approaches.
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Affiliation(s)
| | | | - Sultan Pathan
- Department of Chemistry, Bhupal Nobles
University, Udaipur, Rajasthan, India
| | - Ganesh Kamble
- Department of Chemistry, Osaka University, ISIR 8-1 Mihogaoka, Ibaraki,
Osaka 567-0047, Japan
| | - Girdhar Pal Singh
- Department of Chemistry, Bhupal Nobles
University, Udaipur, Rajasthan, India
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5
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Morla JR, Nareddula DR. Synthesis of dihydroisoquinolinone-4-methylboronic esters via domino Heck/borylation using a structurally characterized palladacycle as a catalyst. RSC Adv 2022; 12:6762-6771. [PMID: 35424619 PMCID: PMC8982083 DOI: 10.1039/d2ra00389a] [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: 01/19/2022] [Accepted: 02/14/2022] [Indexed: 11/21/2022] Open
Abstract
Synthesis of dihydroisoquinolinone-4-methylboronic esters from N-allylcarboxamides and B2(Pin)2via domino Heck/borylation approach is reported. A quinoxaline-based NHC-palladacycle [Pd(C∧C:)PPh3Cl], which has been structurally characterized, is used as a catalyst. The scope of the substrate with a wide range of substituents is explored. In addition to the synthesis of title compounds, a few examples of methylboronic esters of indoline and benzofuran motifs have also been prepared using the same protocol. Synthesis of dihydroisoquinolinone-4-methylboronic esters from N-allylcarboxamides and B2(Pin)2via domino Heck/borylation has been achieved by using a quinoxaline-based NHC-palladacycle [Pd(C∧C:)PPh3Cl].![]()
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Affiliation(s)
- Jhansi Rani Morla
- Department of Chemistry, Pondicherry University Pondicherry 605014 India
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6
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Huang W, Chen Z, Li‐Xia L, Zhou Y, Bo W, Jiang G. A Facile Synthesis of Pyrrolo[2,3‐
j
]phenanthridines
via
the Cascade Reaction of Indoleanilines and Aldehydes. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Wen‐Jun Huang
- Advanced Catalytic Engineer Research Center of Ministry of Education, College of Chemistry and Chemical Engineering Hunan University Changsha China
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian China
| | - Zhi‐Peng Chen
- Advanced Catalytic Engineer Research Center of Ministry of Education, College of Chemistry and Chemical Engineering Hunan University Changsha China
| | - Liu Li‐Xia
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian China
| | - Yong‐Gui Zhou
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian China
| | - Wu Bo
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics, Chinese Academy of Sciences Dalian China
| | - Guo‐Fang Jiang
- Advanced Catalytic Engineer Research Center of Ministry of Education, College of Chemistry and Chemical Engineering Hunan University Changsha China
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7
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Ghora S, Sreenivasulu C, Satyanarayana G. A Domino Heck Coupling–Cyclization–Dehydrogenative Strategy for the One-Pot Synthesis of Quinolines. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1589-7548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractAn efficient, one-pot, domino synthesis of quinolines via the coupling of iodoanilines with allylic alcohols facilitated by palladium catalysis is described. The overall synthetic process involves an intermolecular Heck coupling between 2-iodoanilines and allylic alcohols, intramolecular condensation of in situ generated ketones with an internal amine functional group, and a dehydrogenation sequence. Notably, this protocol occurs in water as a green solvent. Significantly, the method exhibits broad substrate scope and is applied for the synthesis of deuterated quinolines through a deuterium-exchange process.
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8
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Jiang P, Shan Z, Chen S, Wang Q, Jiang S, Zheng H, Deng G. Metal‐Free
Synthesis of Benzo[
a
]phenanthridines from Aromatic Aldehydes, Cyclohexanones, and Aromatic Amines. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pingyu Jiang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Zhifei Shan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Shanping Chen
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Quanyuan Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Shuxin Jiang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Haolin Zheng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
| | - Guo‐Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University Xiangtan Hunan 411105 China
- Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology), Guangzhou Guangdong 510640 China
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9
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Hendrich CM, Senn S, Haas L, Hoffmann MT, Zschieschang U, Greiner LC, Rominger F, Rudolph M, Klauk H, Dreuw A, Hashmi ASK. "Golden" Cascade Cyclization to Benzo[c]-Phenanthridines. Chemistry 2021; 27:14778-14784. [PMID: 34310792 PMCID: PMC8597101 DOI: 10.1002/chem.202102134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 12/11/2022]
Abstract
Herein, we describe a gold-catalyzed cascade cyclization of Boc-protected benzylamines bearing two tethered alkyne moieties in a domino reaction initiated by a 6-endo-dig cyclization. The reaction was screened intensively, and the scope was explored, resulting in nine new Boc-protected dihydrobenzo[c]phenanthridines with yields of up to 98 %; even a π-extension and two bidirectional approaches were successful. Furthermore, thermal cleavage of the Boc group and subsequent oxidation gave substituted benzo[c]phenanthridines in up to quantitative yields. Two bidirectional approaches under the optimized conditions were successful, and the resulting π-extended molecules were tested as organic semiconductors in organic thin-film transistors.
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Affiliation(s)
- Christoph M Hendrich
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Sebastian Senn
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Lea Haas
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Marvin T Hoffmann
- Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Im Neuenheimer Feld 205 A, 69120, Heidelberg, Germany
| | - Ute Zschieschang
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Luca C Greiner
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Matthias Rudolph
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Hagen Klauk
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Im Neuenheimer Feld 205 A, 69120, Heidelberg, Germany
| | - A Stephen K Hashmi
- Organisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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10
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Li Y, Fang F, Zhou J, Li J, Wang R, Liu H, Zhou Y. Rhodium‐Catalyzed C−H Activation/Annulation Cascade of Aryl Oximes and Propargyl Alcohols to Isoquinoline
N
‐Oxides. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100239] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yuan Li
- Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 People's Republic of China
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Feifei Fang
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Jianhui Zhou
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Jiyuan Li
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Run Wang
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
| | - Hong Liu
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
- School of Pharmaceutical Science and Technology Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 People's Republic of China
| | - Yu Zhou
- State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049 People's Republic of China
- School of Pharmaceutical Science and Technology Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 People's Republic of China
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11
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Saini G, Kapur M. Palladium-catalyzed functionalizations of acidic and non-acidic C(sp 3)-H bonds - recent advances. Chem Commun (Camb) 2021; 57:1693-1714. [PMID: 33492315 DOI: 10.1039/d0cc06892f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tremendous upsurge has been seen in the recent decade for the proximal and remote functionalization of activated and unactivated substrates via palladium redox pathways. This feature article discusses some of the recent reports on direct as well as indirect C(sp3)-H functionalization via cross-coupling reactions under palladium catalysis. Activated substrates (possessing acidic C(sp3)-H) including enones, ketones, aldehydes, silylenol ethers, esters, silyl ketene acetals, amides, cyano, α-amino esters, and O-carbamates, capable of undergoing cross-coupling reactions at the α-, β-, γ-, δ- and ε-positions, will be discussed. To overcome the challenging task of achieving regioselectivity, a variety of innovative modifications have been reported. The reports of C-H activations based on directing group, and as native functionality have been illustrated at the β-, γ- and δ-positions. Substrates such as α-amino esters, carbonyls, carboxylic acids and their derivatives, afford site-selective C(sp3)-H functionalization via varied-sized reactive metallacycles and are a unique class of substrates whose C(sp3)-H functionalizations were earlier considered as very difficult.
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Affiliation(s)
- Gaurav Saini
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India.
| | - Manmohan Kapur
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India.
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12
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Talukdar V, Vijayan A, Kumar Katari N, Radhakrishnan KV, Das P. Recent Trends in the Synthesis and Mechanistic Implications of Phenanthridines. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001236] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Vishal Talukdar
- Department of Chemistry Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 India
| | - Ajesh Vijayan
- Department of Chemistry CHRIST (Deemed to be University) Hosur road Bengaluru 560029 India
| | | | - K. V. Radhakrishnan
- CSIR – National Institute for Interdisciplinary Science and Technology Thiruvananthapuram 695019 India
| | - Parthasarathi Das
- Department of Chemistry Indian Institute of Technology (Indian School of Mines) Dhanbad 826004 India
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13
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Gujjarappa R, Vodnala N, Malakar CC. Comprehensive Strategies for the Synthesis of Isoquinolines: Progress Since 2008. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000658] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur Imphal 795004 Manipur India
| | - Nagaraju Vodnala
- Department of Chemistry National Institute of Technology Manipur Imphal 795004 Manipur India
| | - Chandi C. Malakar
- Department of Chemistry National Institute of Technology Manipur Imphal 795004 Manipur India
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14
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Mansour H, El-Hendawy MM. Mechanistic perspectives on piperidine-catalyzed synthesis of 1,5-benzodiazepin-2-ones. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110774] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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15
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Direct benzylic functionalization of pyridines: Palladium-catalyzed mono-α-arylation of α-(2-pyridinyl)acetates with heteroaryl halides. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2019.06.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Saini G, Mondal A, Kapur M. Palladium-Mediated Remote Functionalization in γ- and ε-Arylations and Alkenylations of Unblocked Cyclic Enones. Org Lett 2019; 21:9071-9075. [PMID: 31680525 DOI: 10.1021/acs.orglett.9b03462] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We report herein an extensive investigation of simple and regioselective endo- as well as exo-γ-arylations of silyl-dienol ethers of unblocked cyclic enones with the utilization of palladium-catalyzed, modified Kuwajima-Urabe conditions. We have also successfully explored a new exo-ε-arylation of silyl-trienol ethers of π-extended cyclic enones. In addition, we also report, herein, exclusive γ- and ε-alkenylation of silyl-dienol and silyl-trienol ethers of cyclic enones.
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Affiliation(s)
- Gaurav Saini
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road , Bhauri, Bhopal 462066 , MP , India
| | - Arpan Mondal
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road , Bhauri, Bhopal 462066 , MP , India
| | - Manmohan Kapur
- Department of Chemistry , Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road , Bhauri, Bhopal 462066 , MP , India
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17
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Prasad B, Phanindrudu M, Tiwari DK, Kamal A. Transition-Metal-Free One-Pot Tandem Synthesis of 3-Ketoisoquinolines from Aldehydes and Phenacyl Azides. J Org Chem 2019; 84:12334-12343. [PMID: 31502837 DOI: 10.1021/acs.joc.9b01534] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An efficient and transition-metal-free strategy for the synthesis of 3-keto-isoquinolines in one pot has been developed from the easily accessible 2-(formylphenyl)acrylates and phenacyl azides. Various substituted aldehydes and phenacyl azides were successfully employed in this transformation to furnish a variety 3-keto-isoquinolines in very good yields. A number of controlled experiments were conducted to postulate the reaction mechanism. Secondary functionalizations of 2-keto-isoquinolins were also performed to showcase the synthetic utility.
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Affiliation(s)
- Budaganaboyina Prasad
- Division of Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India
| | - Mandalaparthi Phanindrudu
- Division of Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad 500007 , India
| | - Dharmendra Kumar Tiwari
- Molecular Synthesis and Drug Discovery Laboratory, Center of Biomedical Research , Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus , Raebareli Road , Lucknow 226014 , India
| | - Ahmed Kamal
- School of Pharmaceutical Education and Research (SPER) , Jamia Hamdard , 110 062 New Delhi , India
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18
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Gomez Pinheiro GE, Ihmels H, Dohmen C. Mild Synthesis of Fluorosolvatochromic and Acidochromic 3-Hydroxy-4-pyridylisoquinoline Derivatives from Easily Available Substrates. J Org Chem 2019; 84:3011-3016. [PMID: 30701977 DOI: 10.1021/acs.joc.8b03272] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The reaction of sodium cyanate with benzo[ b]quinolizinium substrates at room temperature gave 3-hydroxy-4-pyridyl-isoquinoline derivatives in good yields. Presumably, the overall reaction proceeds through an ANRORC-type sequence, that is, addition of the nucleophile, ring opening, and ring closure. Preliminary photophysical investigation of the parent compound revealed a pronounced sensitivity of its emission properties toward solvent effects and the pH of the medium.
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Affiliation(s)
- Gabriel E Gomez Pinheiro
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
| | - Heiko Ihmels
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
| | - Christoph Dohmen
- Department of Chemistry and Biology, and Center of Micro and Nanochemistry and Engineering , University of Siegen , Adolf-Reichwein-Str. 2 , 57068 Siegen , Germany
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19
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Sun YW, Bei YM, Wang LZ. A catalyst-free four-component domino reaction for the synthesis of functionalized 3-acyl-1,5-benzodiazepines. Org Biomol Chem 2019; 17:930-938. [PMID: 30629079 DOI: 10.1039/c8ob02903b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various functional 3-acyl-1,5-benzodiazepines containing carboxyl, ester and acyl groups at the 2-position were synthesized via an efficient, sustainable and catalyst-free domino reaction. During the synthesis process, one new cycle and four new bonds (one C-C, two C-N and one C[double bond, length as m-dash]C) were constructed by the nucleophilic substitution, nucleophilic addition, dehydration and cyclization reaction by the H+ shift. Furthermore, a total of 26 examples were examined by reacting inexpensive starting materials of N,N-dimethylformamide dimethyl acetal, aromatic ketones, 1,2-phenylenediamine compounds and aldehyde derivatives. Therefore, it displayed a broad substrate scope, good functional group tolerance, high yields (77-97%) and the ease of obtaining target compounds without the involvement of toxic solvents and column chromatography, which provided a novel method for the synthesis of a wide variety of biologically relevant 1,5-benzodiazepines.
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Affiliation(s)
- Yue-Wei Sun
- College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang 050024, China.
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20
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Kumar GS, Singh D, Kumar M, Kapur M. Palladium-Catalyzed Aerobic Oxidative Coupling of Allylic Alcohols with Anilines in the Synthesis of Nitrogen Heterocycles. J Org Chem 2018. [DOI: 10.1021/acs.joc.8b00287] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Gangam Srikanth Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
| | - Diksha Singh
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
| | - Manish Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
| | - Manmohan Kapur
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
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21
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Sun YW, Wang LZ. One-pot synthesis of novel functionalized benzodiazepines via three-component or domino reactions. NEW J CHEM 2018. [DOI: 10.1039/c8nj04893b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and highly efficient protocol for the one-pot synthesis of novel benzodiazepines, which fused tricyclic or tetracyclic systems containing aryl, carboxyl, ester and acyl groups, was developed. Libraries of 40 new compounds were successfully synthesized via three-component or domino reactions by using a mild catalyst (γ-Fe2O3@SiO2/CeCl3) in good to excellent yields (82–97%).
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Affiliation(s)
- Yue-Wei Sun
- College of Chemistry & Material Science
- Hebei Normal University
- Shijiazhuang 050024
- China
| | - Lan-Zhi Wang
- College of Chemistry & Material Science
- Hebei Normal University
- Shijiazhuang 050024
- China
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22
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Jaiswal Y, Kumar Y, Pal J, Subramanian R, Kumar A. Rapid synthesis of polysubstituted phenanthridines from simple aliphatic/aromatic nitriles and iodo arenes via Pd(ii) catalyzed domino C–C/C–C/C–N bond formation. Chem Commun (Camb) 2018; 54:7207-7210. [DOI: 10.1039/c8cc03556c] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An efficient method has been developed for the synthesis of polysubstituted phenanthridiene via palladium catalyzed nucleophilic addition of aryl iodides to nitriles followed by dual C–H activation.
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Affiliation(s)
- Yogesh Jaiswal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - Yogesh Kumar
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - Jagannath Pal
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - Ranga Subramanian
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - Amit Kumar
- Department of Chemistry
- Indian Institute of Technology Patna
- Bihta 801106
- India
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