1
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Shet H, Gunturu KC, Gharpure SJ, Prasad Kommyreddy S, Gupta KS, Rout SR, Dandela R, Kapdi AR. Cu(II)/PTABS-Promoted, Regioselective S NAr Amination of Polychlorinated Pyrimidines with Mechanistic Understanding. J Org Chem 2023. [PMID: 37486860 DOI: 10.1021/acs.joc.3c01003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
Regioselective amination of polyhalogenated heteroarenes (especially pyrimidines) has extensive synthetic and commercial relevance for drug synthesis applications but is plagued by the lack of effective synthetic strategies. Herein, we report the Cu(II)/PTABS-promoted highly regioselective nucleophilic aromatic substitution (SNAr) of polychlorinated pyrimidines assisted by DFT predictions of the bond dissociation energies of different C-Cl bonds. The unique reactivity of Cu(II)-PTABS has been attributed to the coordination/activation mechanism that has been known to operate in these reactions, but further insights into the catalytic species have also been provided.
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Affiliation(s)
- Harshita Shet
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | | | - Santosh J Gharpure
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | | | - Krishna S Gupta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Smruti Rekha Rout
- Department of Chemistry, Institute of Chemical Technology, Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar, Odisha 751013, India
| | - Rambabu Dandela
- Department of Chemistry, Institute of Chemical Technology, Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar, Odisha 751013, India
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
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2
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Gaware S, Kori S, Serrano JL, Dandela R, Hilton S, Sanghvi YS, Kapdi AR. Rapid plugged flow synthesis of nucleoside analogues via Suzuki-Miyaura coupling and heck Alkenylation of 5-Iodo-2'-deoxyuridine (or cytidine). J Flow Chem 2023; 13:1-18. [PMID: 37359287 PMCID: PMC10019434 DOI: 10.1007/s41981-023-00265-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 02/09/2023] [Indexed: 03/17/2023]
Abstract
Nucleosides modification via conventional cross-coupling has been performed using different catalytic systems and found to take place via long reaction times. However, since the pandemic, nucleoside-based antivirals and vaccines have received widespread attention and the requirement for rapid modification and synthesis of these moieties has become a major objective for researchers. To address this challenge, we describe the development of a rapid flow-based cross-coupling synthesis protocol for a variety of C5-pyrimidine substituted nucleosides. The protocol allows for facile access to multiple nucleoside analogues in very good yields in a few minutes compared to conventional batch chemistry. To highlight the utility of our approach, the synthesis of an anti-HSV drug, BVDU was also achieved in an efficient manner using our new protocol. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s41981-023-00265-1.
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Affiliation(s)
- Sujeet Gaware
- Department of Chemistry, Institute of Chemical Technology, Indian Oil Odisha, Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Odisha-751013, Bhubaneswar, India
| | - Santosh Kori
- Department of Chemistry, Institute of Chemical Technology, Indian Oil Odisha, Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Odisha-751013, Bhubaneswar, India
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Mumbai, Matunga 400019 India
| | - Jose Luis Serrano
- Departamento de Ingeniería Química y Ambiental. Área de Química Inorgánica, Universidad Politécnica de Cartagena member of European University of Technology, 30203 Cartagena, Spain
| | - Rambabu Dandela
- Department of Chemistry, Institute of Chemical Technology, Indian Oil Odisha, Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Odisha-751013, Bhubaneswar, India
| | - Stephen Hilton
- UCL School of Pharmacy, 29-39 Brunswick Square, London, WC1N 1AX UK
| | - Yogesh S. Sanghvi
- Rasayan Inc., 2802, Crystal Ridge, California, Encinitas CA92024-6615 USA
| | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Mumbai, Matunga 400019 India
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3
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Fitzgerald SA, Xiao X, Zhao J, Horton PN, Coles SJ, Knighton RC, Ward BD, Pope SJA. Organometallic Platinum(II) Photosensitisers that Demonstrate Ligand-Modulated Triplet-Triplet Annihilation Energy Upconversion Efficiencies. Chemistry 2023; 29:e202203241. [PMID: 36394514 PMCID: PMC10107691 DOI: 10.1002/chem.202203241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/16/2022] [Accepted: 11/17/2022] [Indexed: 11/18/2022]
Abstract
A series of 2-phenylquinoxaline ligands have been synthesised that introduce either CF3 or OCF3 electron-withdrawing groups at different positions of the phenyl ring. These ligands were investigated as cyclometalating reagents for platinum(II) to give neutral complexes of the form [Pt(C^N)(acac)] (in which C^N=cyclometalating ligand; acac=acetyl acetonate). X-ray crystallographic studies on three examples showed that the complexes adopt an approximate square planar geometry. All examples revealed strong Pt-Pt linear contacts of 3.2041(6), 3.2199(3) and 3.2586(2) Å. The highly coloured complexes display efficient visible absorption at 400-500 nm (ϵ ≈5000 M-1 cm-1 ) and orange red photoluminescent characteristics (λem =603-620 nm; Φem ≤37 %), which were subtly tuned by the ligand. Triplet emitting character was confirmed by microsecond luminescence lifetimes and the photogeneration of singlet oxygen with quantum efficiencies up to 57 %. Each complex was investigated as a photosensitiser for triplet-triplet annihilation energy upconversion using 9,10-diphenylanthracene as the annihilator species: a range of good upconversion efficiencies (ΦUC 5.9-14.1 %) were observed and shown to be strongly influenced by the ligand structure in each case.
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Affiliation(s)
- Sophie A Fitzgerald
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, UK
| | - Xiao Xiao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Jianzhang Zhao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Peter N Horton
- UK National Crystallographic Service, Chemistry, University of Southampton Highfield, Southampton, SO17 1BJ, UK
| | - Simon J Coles
- UK National Crystallographic Service, Chemistry, University of Southampton Highfield, Southampton, SO17 1BJ, UK
| | - Richard C Knighton
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, UK
| | - Benjamin D Ward
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, UK
| | - Simon J A Pope
- School of Chemistry, Main Building, Cardiff University, Cardiff, CF10 3AT, UK
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4
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Shet H, Patel M, Waikar JM, More PM, Sanghvi YS, Kapdi AR. Room-Temperature Dialkylamination of Chloroheteroarenes Using a Cu(II)/PTABS Catalytic System. Chem Asian J 2023; 18:e202201006. [PMID: 36355632 DOI: 10.1002/asia.202201006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 10/21/2022] [Indexed: 11/12/2022]
Abstract
The dimethylamino functionality has significant importance in industrially relevant molecules and methodologies to install these efficiently are highly desirable. We report herein a highly efficient, room-temperature dimethylamination of chloroheteroarenes performed via the in-situ generation of dimethylamine using N,N-dimethylformamide (DMF) as precursor wiith a large substrate scope that includes various heteroarenes, purines as well as commercially relevant drugs such as altretamine, ampyzine and puromycin precursor.
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Affiliation(s)
- Harshita Shet
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai, 400019, India.,Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar, 751013, Odisha, India
| | - Manisha Patel
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai, 400019, India
| | - Jyoti M Waikar
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai, 400019, India
| | - Pavan M More
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai, 400019, India
| | - Yogesh S Sanghvi
- Rasayan Inc., 2802 Crystal Ridge road, Encinitas, CA 92024-6615, U.S.A
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai, 400019, India
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5
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Shaughnessy KH. Covalent Modification of Nucleobases using Water-Soluble Palladium Catalysts. CHEM REC 2022; 22:e202200190. [PMID: 36074958 DOI: 10.1002/tcr.202200190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/25/2022] [Indexed: 12/15/2022]
Abstract
Nucleosides represent one of the key building blocks of biochemistry. There is significant interest in the synthesis of nucleoside-derived materials for applications as probes, biochemical models, and pharmaceuticals. Palladium-catalyzed cross-coupling reactions are effective methods for making covalent modification of carbon and nitrogen sites on nucleobases under mild conditions. Water-soluble catalysts derived from palladium and hydrophilic ligands, such as tris(3-sulfonatophenyl)phosphine trisodium (TPPTS), are efficient catalysts for a range of coupling reactions of unprotected halonucleosides. Over the past two decades, these methods have been extended to direct functionalization of halonucleotides, as well as RNA and DNA oligonucleotides (ONs) containing halogenated bases. These methods can be run under biocompatible conditions, including examples of Suzuki coupling of modified DNA in whole cells and tissue samples. In this account, development of this methodology by our group and others is highlighted along with the extension of these catalyst systems to modification of nucleotides and ONs.
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Affiliation(s)
- Kevin H Shaughnessy
- Department of Chemistry & Biochemistry, The University of Alabama, Box 870336, Tuscaloosa, AL 35487-0336, USA
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6
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Horbaczewskyj CS, Fairlamb IJS. Pd-Catalyzed Cross-Couplings: On the Importance of the Catalyst Quantity Descriptors, mol % and ppm. Org Process Res Dev 2022; 26:2240-2269. [PMID: 36032362 PMCID: PMC9396667 DOI: 10.1021/acs.oprd.2c00051] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Indexed: 12/26/2022]
Abstract
![]()
This Review examines parts per million (ppm) palladium
concentrations
in catalytic cross-coupling reactions and their relationship with
mole percentage (mol %). Most studies in catalytic cross-coupling
chemistry have historically focused on the concentration ratio between
(pre)catalyst and the limiting reagent (substrate), expressed as mol
%. Several recent papers have outlined the use of “ppm level”
palladium as an alternative means of describing catalytic cross-coupling
reaction systems. This led us to delve deeper into the literature
to assess whether “ppm level” palladium is a practically
useful descriptor of catalyst quantities in palladium-catalyzed cross-coupling
reactions. Indeed, we conjectured that many reactions could, unknowingly,
have employed low “ppm levels” of palladium (pre)catalyst,
and generally, what would the spread of ppm palladium look like across
a selection of studies reported across the vast array of the cross-coupling
chemistry literature. In a few selected examples, we have examined
other metal catalyst systems for comparison with palladium.
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Affiliation(s)
| | - Ian J. S. Fairlamb
- University of York, Heslington, York, North Yorkshire, YO10 5DD, United Kingdom
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7
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Serrano JL, Gaware S, Pérez JA, Pérez J, Lozano P, Kori S, Dandela R, Sanghvi YS, Kapdi AR. Quadrol-Pd(II) complexes: phosphine-free precatalysts for the room-temperature Suzuki-Miyaura synthesis of nucleoside analogues in aqueous media. Dalton Trans 2022; 51:2370-2384. [PMID: 35043803 DOI: 10.1039/d1dt03778a] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Commercially available Quadrol, N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine (THPEN), has been used for the first time as a N^N-donor neutral hydrophilic ligand in the synthesis and characterization of new water soluble palladium(II) complexes containing chloride, phthalimidate or saccharinate as co-ligands. [PdCl2(THPEN)] (1) [Pd(phthal)2(THPEN)] (2), [Pd(sacc)2(THPEN)] (3) and the analogous complex with the closely related N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (THEEN) [Pd(sacc)2(THEEN)] (4) were efficiently prepared in a one-pot reaction from [PdCl2(CH3CN)2] or Pd(OAc)2. Structural characterization of 1 and 3 by single crystal X-ray diffraction produced the first structures reported to date of palladium complexes with Quadrol. The resultant palladium complexes are highly soluble in water and were found to be effective as phosphine-free catalysts for the synthesis of functionalized nucleoside analogues under room-temperature Suzuki-Miyaura cross-coupling conditions between 5-iodo-2'-deoxyuridine (& 5-iodo-2'-deoxycytidine) with different aryl boronic acids in neat water. This is the first report of the coupling process performed on nucleosides in water at room temperature.
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Affiliation(s)
- José Luis Serrano
- Departamento de Ingeniería Química y Ambiental. Área de Química Inorgánica, Universidad Politécnica de Cartagena member of European University of Technology, 30203 Cartagena, Spain.
| | - Sujeet Gaware
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
| | - Jose Antonio Pérez
- Departamento de Ingeniería Química y Ambiental. Área de Química Inorgánica, Universidad Politécnica de Cartagena member of European University of Technology, 30203 Cartagena, Spain.
| | - José Pérez
- Departamento de Ingeniería Química y Ambiental. Área de Química Inorgánica, Universidad Politécnica de Cartagena member of European University of Technology, 30203 Cartagena, Spain.
| | - Pedro Lozano
- Departamento de Bioquímica y Biología Molecular B e Inmunología, Facultad de Química, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, 30071 Murcia, Spain
| | - Santosh Kori
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
- Department of Chemistry, Institute of Chemical Technology, Mumbai, Nathalal Road, Matunga, Mumbai-400019, India.
| | - Rambabu Dandela
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
| | - Yogesh S Sanghvi
- Rasayan Inc. 2802, Crystal Ridge Road, Encinitas, California, 92024-6615, USA
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Mumbai, Nathalal Road, Matunga, Mumbai-400019, India.
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8
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Ahmad H, Ahmed W, Hassan A. Goldberg Coupling of Thiazole Substituted Aryl Bromide Demands Stoichiometric Copper Compared to Oxazole. ChemistrySelect 2022. [DOI: 10.1002/slct.202103940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Haseen Ahmad
- Department of Chemistry Quaid-i-Azam University Islamabad 45320 Pakistan
| | - Waqar Ahmed
- Department of Chemistry Quaid-i-Azam University Islamabad 45320 Pakistan
| | - Abbas Hassan
- Department of Chemistry Quaid-i-Azam University Islamabad 45320 Pakistan
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9
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Sebastian D, Satishkumar S, Pradhan P, Yang L, Lakshman MK. General Approach to N6,C5'-Difunctionalization of Adenosine. J Org Chem 2021; 87:18-39. [PMID: 34905365 DOI: 10.1021/acs.joc.1c01587] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Among the C6-halo purine ribonucleosides, the readily accessible 6-chloro derivative has been known to undergo slow SNAr reactions with amines, particularly aryl amines. In this work, we show that in 0.1 M AcOH in EtOH, aryl amines react quite efficiently at the C6-position of 2',3',5'-tri-O-(t-BuMe2Si)-protected 6-chloropurine riboside (6-ClP-riboside), with concomitant cleavage of the 5'-silyl group. These two-step processes proceeded in generally good yields, and notably, reactions in the absence of AcOH were much slower and/or lower yielding. Corresponding reactions of 2',3',5'-tri-O-(t-BuMe2Si)-protected 6-ClP-riboside with alkyl amines proceeded well but without desilylation at the primary hydroxyl terminus. These differences are likely due to the acidities of the ammonium chlorides formed in these reactions, and the role of AcOH was not desilylation but possibly only purine activation. With 50% aqueous TFA in THF at 0 °C, cleavage of the 5'-silyl group from 2',3',5'-tri-O-(t-BuMe2Si)-protected N6-alkyl adenosine derivatives and from 6-ClP-riboside was readily achieved. Reactions of the 5'-deprotected 6-ClP-riboside with alkyl amines proceeded in high yields and under mild conditions. Because these complementary methodologies yielded N6-aryl and -alkyl adenosine derivatives containing a free 5'-hydroxyl group, a variety of product functionalizations were undertaken to yield N6,C5'-doubly modified nucleoside analogues.
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Affiliation(s)
- Dellamol Sebastian
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States.,The Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
| | - Sakilam Satishkumar
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Padmanava Pradhan
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Lijia Yang
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Mahesh K Lakshman
- Department of Chemistry and Biochemistry, The City College of New York, 160 Convent Avenue, New York, New York 10031, United States.,The Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, New York 10016, United States
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10
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Li DH, Lan XB, Song AX, Rahman MM, Xu C, Huang FD, Szostak R, Szostak M, Liu FS. Buchwald-Hartwig Amination of Coordinating Heterocycles Enabled by Large-but-Flexible Pd-BIAN-NHC Catalysts*. Chemistry 2021; 28:e202103341. [PMID: 34773313 DOI: 10.1002/chem.202103341] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Indexed: 01/21/2023]
Abstract
A new class of large-but-flexible Pd-BIAN-NHC catalysts (BIAN=acenaphthoimidazolylidene, NHC=N-heterocyclic carbene) has been rationally designed to enable the challenging Buchwald-Hartwig amination of coordinating heterocycles. This robust class of BIAN-NHC catalysts permits cross-coupling under practical aerobic conditions of a variety of heterocycles with aryl, alkyl, and heteroarylamines, including historically challenging oxazoles and thiazoles as well as electron-deficient heterocycles containing multiple heteroatoms with BIAN-INon (N,N'-bis(2,6-di(4-heptyl)phenyl)-7H-acenaphtho[1,2-d]imidazol-8-ylidene) as the most effective ligand. Studies on the ligand structure and electronic properties of the carbene center are reported. The study should facilitate the discovery of even more active catalyst systems based on the unique BIAN-NHC scaffold.
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Affiliation(s)
- Dong-Hui Li
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong, 528458, P. R. China
| | - Xiao-Bing Lan
- Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application, School of Chemistry and Environmental Science, Xiangnan University, Chenzhou, Hunan Province 423000, P. R. China
| | - A-Xiang Song
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong, 528458, P. R. China
| | - Md Mahbubur Rahman
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA
| | - Chang Xu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong, 528458, P. R. China
| | - Fei-Dong Huang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong, 528458, P. R. China
| | - Roman Szostak
- Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw, 50-383, Poland
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong, 528458, P. R. China
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11
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Fitzgerald SA, Otaif HY, Elgar CE, Sawicka N, Horton PN, Coles SJ, Beames JM, Pope SJA. Polysubstituted Ligand Framework for Color Tuning Phosphorescent Iridium(III) Complexes. Inorg Chem 2021; 60:15467-15484. [PMID: 34605234 DOI: 10.1021/acs.inorgchem.1c02121] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of ligands have been synthesized based upon a polysubstituted 2-phenylquinoxaline core structure. These ligands introduce different combinations of fluorine and methyl substituents on both the phenyl and quinoxaline constituent rings. The resultant investigation of these species as cyclometalating agents for Ir(III) gave cationic complexes of the form [Ir(C^N)2(bipy)]PF6 (where C^N = cyclometalating ligand; bipy = 2,2'-bipyridine). X-ray crystallographic studies were conducted on four complexes and each revealed the expected distorted octahedral geometry based upon a cis-C,C and trans-N,N ligand arrangement at Ir(III). Supporting computational studies predict that each of the complexes share the same general descriptions for the frontier orbitals. TD-DFT calculations suggest MLCT contributions to the lowest energy absorption and a likely MLCT/ILCT/LLCT nature to the emitting state. Experimentally, the complexes display tunable luminescence across the yellow-orange-red part of the visible spectrum (λem = 579-655 nm).
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Affiliation(s)
- Sophie A Fitzgerald
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Haleema Y Otaif
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Christopher E Elgar
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Natalia Sawicka
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Peter N Horton
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, England, United Kingdom
| | - Simon J Coles
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, England, United Kingdom
| | - Joseph M Beames
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
| | - Simon J A Pope
- School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, Cymru/Wales, United Kingdom
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12
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Buchwald–Hartwig reaction: an update. MONATSHEFTE FUR CHEMIE 2021. [DOI: 10.1007/s00706-021-02834-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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13
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Ouyang JS, Liu S, Pan B, Zhang Y, Liang H, Chen B, He X, Chan WTK, Chan ASC, Sun TY, Wu YD, Qiu L. A Bulky and Electron-Rich N-Heterocyclic Carbene–Palladium Complex (SIPr)Ph2Pd(cin)Cl: Highly Efficient and Versatile for the Buchwald–Hartwig Amination of (Hetero)aryl Chlorides with (Hetero)aryl Amines at Room Temperature. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01929] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jia-Sheng Ouyang
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Siqi Liu
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Bendu Pan
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Yaqi Zhang
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Hao Liang
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Bin Chen
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Xiaobo He
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Wesley Ting Kwok Chan
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Albert S. C. Chan
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
| | - Tian-Yu Sun
- Shenzhen Bay Laboratory, Shenzhen, 518132, China
| | - Yun-Dong Wu
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Shenzhen Bay Laboratory, Shenzhen, 518132, China
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Liqin Qiu
- School of Chemistry, Guangdong Key Lab of Chiral Molecules and Drug Discovery, Sun Yat-sen University, Number 135 Xingangxi Road, Guangzhou 510275, China
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14
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Parmar U, Somvanshi D, Kori S, Desai AA, Dandela R, Maity DK, Kapdi AR. Room-Temperature Amination of Chloroheteroarenes in Water by a Recyclable Copper(II)-Phosphaadamantanium Sulfonate System. J Org Chem 2021; 86:8900-8925. [PMID: 34156851 DOI: 10.1021/acs.joc.1c00845] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Buchwald-Hartwig amination of chloroheteroarenes has been a challenging synthetic process, with very few protocols promoting this important transformation at ambient temperature. The current report discusses about an efficient copper-based catalytic system (Cu/PTABS) for the amination of chloroheteroarenes at ambient temperature in water as the sole reaction solvent, a combination that is first to be reported. A wide variety of chloroheteroarenes could be coupled efficiently with primary and secondary amines as well as selected amino acid esters under mild reaction conditions. Catalytic efficiency of the developed protocol also promotes late-stage functionalization of active pharmaceutical ingredients (APIs) such as antibiotics (floxacins) and anticancer drugs. The catalytic system also performs efficiently at a very low concentration of 0.0001 mol % (TON = 980,000) and can be recycled 12 times without any appreciable loss in activity. Theoretical calculations reveal that the π-acceptor ability of the ligand PTABS is the main reason for the appreciably high reactivity of the catalytic system. Preliminary characterization of the catalytic species in the reaction was carried out using UV-VIS and ESR spectroscopy, providing evidence for the Cu(II) oxidation state.
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Affiliation(s)
- Udaysinh Parmar
- Aether Industries Limited, B-21/7, Hojiwala Industrial Estate, Sachin, Surat 394230, Gujarat, India
| | - Dipesh Somvanshi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai 400019, India
| | - Santosh Kori
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai 400019, India
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Khragpur extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
| | - Aman A Desai
- Aether Industries Limited, B-21/7, Hojiwala Industrial Estate, Sachin, Surat 394230, Gujarat, India
| | - Rambabu Dandela
- Department of Industrial and Engineering Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Khragpur extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
| | - Dilip K Maity
- Chemical Sciences, Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
- Chemical Sciences, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai 400019, India
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15
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Aiding a Better Understanding of Molybdopterin: Syntheses, Structures, and pKa Value Determinations of Varied Pterin-Derived Organic Scaffolds Including Oxygen, Sulfur and Phosphorus Bearing Substituents. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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16
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Neporozhneva OV, Studentzsov EP, Ramsh SM. Reactions of Adenine and Its N-Exo Substituted Analogues with Phenyl Glycidyl Ether. RUSS J GEN CHEM+ 2021. [DOI: 10.1134/s1070363220120051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Puleo TR, Sujansky SJ, Wright SE, Bandar JS. Organic Superbases in Recent Synthetic Methodology Research. Chemistry 2021; 27:4216-4229. [DOI: 10.1002/chem.202003580] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Thomas R. Puleo
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Stephen J. Sujansky
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Shawn E. Wright
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
| | - Jeffrey S. Bandar
- Department of Chemistry Colorado State University Fort Collins Colorado 80523 USA
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18
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Serrano JL, García L, Pérez J, Lozano P, Correia J, Kori S, Kapdi AR, Sanghvi YS. Imine-Palladacycles as Phosphine-Free Precatalysts for Low-Temperature Suzuki–Miyaura Synthesis of Nucleoside Analogues in Aqueous Media. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00580] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- José Luis Serrano
- Departamento de Ingeniería Química, Área de Química Inorgánica, 30203 Regional Campus of International Excellence, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - Luis García
- Departamento de Ingeniería Química, Área de Química Inorgánica, 30203 Regional Campus of International Excellence, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - José Pérez
- Departamento de Ingeniería Química, Área de Química Inorgánica, 30203 Regional Campus of International Excellence, Universidad Politécnica de Cartagena, 30203 Cartagena, Spain
| | - Pedro Lozano
- Departamento de Bioquímica y Biología Molecular B e Inmunología, Facultad de Química, Regional Campus of International Excellence “Campus Mare Nostrum”, Universidad de Murcia, 30071 Murcia, Spain
| | - Jevy Correia
- Institute of Chemical Technology, Mumbai, Nathalal Road,
Matunga, Mumbai 400019, India
| | - Santosh Kori
- Institute of Chemical Technology, Mumbai, Nathalal Road,
Matunga, Mumbai 400019, India
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza Samantpuri, Bhubaneswar 751013, Odisha, India
| | - Anant R. Kapdi
- Institute of Chemical Technology, Mumbai, Nathalal Road,
Matunga, Mumbai 400019, India
| | - Yogesh S. Sanghvi
- Rasayan Inc., 2802 Crystal Ridge Road, Encinitas, California 92024-6615, United States
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19
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Uçar S, Daştan A. Transition Metal-Free Heteroarylation of Quinoxaline: Construction of Heteroaryl-Fused Phenazines by Oxidative Coupling. J Org Chem 2020; 85:15502-15513. [PMID: 33185428 DOI: 10.1021/acs.joc.0c02252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise method for the construction of heteroaryl-fused phenazines was developed via PIFA-BF3·Et2O-mediated oxidative coupling of di-heteroarylated quinoxalines for the first time. Synthesis of mono- and di-heteroarylation of quinoxaline was performed effectively using only LiTMP reagent under transition metal-free conditions and without the use of halogen-containing starting compounds. In addition, nonsymmetrical di-heteroarylated quinoxalines were synthesized through reheteroarylation of mono-heteroarylated quinoxalines in the same way. Oxidation of the saturated compounds formed after heteroarylation was easily accomplished with iodine. The UV-vis absorption and fluorescence features of some compounds were examined.
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Affiliation(s)
- Sefa Uçar
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum 25240, Turkey
| | - Arif Daştan
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum 25240, Turkey
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20
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Murthy Bandaru SS, Bhilare S, Schulzke C, Kapdi AR. 1,3,5-Triaza-7-phosphaadamantane (PTA) Derived Caged Phosphines for Palladium-Catalyzed Selective Functionalization of Nucleosides and Heteroarenes. CHEM REC 2020; 21:188-203. [PMID: 33231365 DOI: 10.1002/tcr.202000109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/08/2020] [Accepted: 10/13/2020] [Indexed: 12/29/2022]
Abstract
Phosphines have, in combination with transition metals, played a pivotal role in the rapid development of efficient catalytic processes. Caged phosphines constitute a class of three-dimensional scaffolds providing unique control over steric and electronic properties. The versatility of the caged phosphine ligands has been demonstrated elegantly by the groups of Verkade, Gonzalvi as well as Stradiotto. Our research group has also been working extensively for the past several years in the development of 1,3,5-triaza-7-phosphaadamantane-based caged ligands and in this personal note we have summarized these applications pertaining to the modification of biologically useful nucleosides and heteroarenes.
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Affiliation(s)
- Siva Sankar Murthy Bandaru
- Institute fur Biochemie, University of Greifswald, Felix-Hausdorff-Strasse 4, D-17487, Greifswald, Germany
| | - Shatrughn Bhilare
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai, 400019, India
| | - Carola Schulzke
- Institute fur Biochemie, University of Greifswald, Felix-Hausdorff-Strasse 4, D-17487, Greifswald, Germany
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh road, Matunga, Mumbai, 400019, India
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21
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Lau SH, Yu P, Chen L, Madsen-Duggan CB, Williams MJ, Carrow BP. Aryl Amination Using Soluble Weak Base Enabled by a Water-Assisted Mechanism. J Am Chem Soc 2020; 142:20030-20039. [PMID: 33179489 DOI: 10.1021/jacs.0c09275] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The amination of aryl halides has become one of the most commonly practiced C-N bond-forming reactions in pharmaceutical and laboratory syntheses. The widespread use of strong or poorly soluble inorganic bases for amine activation nevertheless complicates the compatibility of this important reaction class with sensitive substrates as well as applications in flow and automated synthesis, to name a few. We report a palladium-catalyzed C-N coupling using Et3N as a weak, soluble base, which allows a broad substrate scope that includes bromo- and chloro(hetero)arenes, primary anilines, secondary amines, and amide type nucleophiles together with tolerance for a range of base-sensitive functional groups. Mechanistic data have established a unique pathway for these reactions in which water serves multiple beneficial roles. In particular, ionization of a neutral catalytic intermediate via halide displacement by H2O generates, after proton loss, a coordinatively unsaturated Pd-OH species that can bind amine substrate triggering intramolecular N-H heterolysis. This water-assisted pathway operates efficiently with even weak terminal bases, such as Et3N. The use of a simple, commercially available ligand, PAd3, is key to this water-assisted mechanism by promoting coordinative unsaturation in catalytic intermediates responsible for the heterolytic activation of strong element-hydrogen bonds, which enables broad compatibility of carbon-heteroatom cross-coupling reactions with sensitive substrates and functionality.
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Affiliation(s)
- Sii Hong Lau
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Peng Yu
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Liye Chen
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Christina B Madsen-Duggan
- Chemical Process Development, Bristol Myers Squibb, 556 Morris Avenue, Summit, New Jersey 07902, United States
| | - Michael J Williams
- Chemical Process Development, Bristol Myers Squibb, 556 Morris Avenue, Summit, New Jersey 07902, United States
| | - Brad P Carrow
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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22
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Kapdi AR, Bhilare S, Kori S, Shet H, Balaram G, Mahendar K, Sanghvi YS. Scale-Up of a Heck Alkenylation Reaction: Application to the Synthesis of an Amino-Modifier Nucleoside ‘Ruth Linker’. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707260] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
AbstractRuth linker is a C5 pyrimidine modified nucleoside analogue widely utilized for the incorporation of a primary amine in a synthetic oligonucleotide. The increasing demand for non-radioactive labeling, detection of biomolecules, and assembly of COVID-19 test kits has triggered a need for scale-up of Ruth linker. Herein, an efficient protocol involving a palladium-catalyzed Heck alkenylation is described. The synthesis has been optimized with a goal of low catalyst concentration, column-free isolation, high product purity, reproducibility, and shorter reaction time. The scalability and utility of the process have been demonstrated successfully on a 100 g scale (starting material). Additionally, for scale-up of the Heck alkenylation protocol, 7-phospha-1,3,5-triaza-adamantanebutane sulfonate (PTABS) as the coordinating caged phosphine ligand was also synthesized on a multigram scale after careful optimization of the conditions.
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Affiliation(s)
- Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology
| | | | - Santosh Kori
- Department of Chemistry, Institute of Chemical Technology
- Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre
| | - Harshita Shet
- Department of Chemistry, Institute of Chemical Technology
- Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre
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23
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Atdjian C, Coelho D, Iannazzo L, Ethève-Quelquejeu M, Braud E. Synthesis of Triazole-Linked SAM-Adenosine Conjugates: Functionalization of Adenosine at N-1 or N-6 Position without Protecting Groups. Molecules 2020; 25:molecules25143241. [PMID: 32708658 PMCID: PMC7397255 DOI: 10.3390/molecules25143241] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 07/06/2020] [Accepted: 07/10/2020] [Indexed: 12/17/2022] Open
Abstract
More than 150 RNA chemical modifications have been identified to date. Among them, methylation of adenosine at the N-6 position (m6A) is crucial for RNA metabolism, stability and other important biological events. In particular, this is the most abundant mark found in mRNA in mammalian cells. The presence of a methyl group at the N-1 position of adenosine (m1A) is mostly found in ncRNA and mRNA and is mainly responsible for stability and translation fidelity. These modifications are installed by m6A and m1A RNA methyltransferases (RNA MTases), respectively. In human, deregulation of m6A RNA MTases activity is associated with many diseases including cancer. To date, the molecular mechanism involved in the methyl transfer, in particular substrate recognition, remains unclear. We report the synthesis of new SAM-adenosine conjugates containing a triazole linker branched at the N-1 or N-6 position of adenosine. Our methodology does not require protecting groups for the functionalization of adenosine at these two positions. The molecules described here were designed as potential bisubstrate analogues for m6A and m1A RNA MTases that could be further employed for structural studies. This is the first report of compounds mimicking the transition state of the methylation reaction catalyzed by m1A RNA MTases.
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24
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Zheng N, Liu C, Ding YN, Shi WY, Zhang BS, Liang YM. Copper-Catalyzed Three-Component Redox-Neutral Ring Opening of Benzothiazoles to 1-Amino- N-(2-(phenylthio)phenyl)methanimine. J Org Chem 2020; 85:7666-7673. [PMID: 32479726 DOI: 10.1021/acs.joc.9b03489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Copper-catalyzed three-component redox-neutral ring opening of benzothiazoles with aryl iodides and O-benzoyl hydroxylamines for the synthesis of 1-amino-N-(2-(phenylthio)phenyl)methanimine has been developed. This one-pot reaction undergoes C-S and N-O bond cleavage and new C-S and C-N bond construction. Several control experiments excluded a free radical procedure and also demonstrated the secondary amine as a possible intermediate, which was vital to the catalytic reaction. Meanwhile, the deuteration experiment got rid of the C-H activation dehydroisomerization of the benzothiazole mechanism.
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Affiliation(s)
- Nian Zheng
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Ce Liu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Ya-Nan Ding
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Wei-Yu Shi
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Bo-Sheng Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Yong-Min Liang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, People's Republic of China
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25
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Bhilare S, Shet H, Sanghvi YS, Kapdi AR. Discovery, Synthesis, and Scale-up of Efficient Palladium Catalysts Useful for the Modification of Nucleosides and Heteroarenes. Molecules 2020; 25:E1645. [PMID: 32260100 PMCID: PMC7181029 DOI: 10.3390/molecules25071645] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 03/25/2020] [Accepted: 04/01/2020] [Indexed: 02/07/2023] Open
Abstract
Nucleic acid derivatives are imperative biomolecules and are involved in life governing processes. The chemical modification of nucleic acid is a fascinating area for researchers due to the potential activity exhibited as antiviral and antitumor agents. In addition, these molecules are also of interest toward conducting useful biochemical, pharmaceutical, and mutagenic study. For accessing such synthetically useful structures and features, transition-metal catalyzed processes have been proven over the years to be an excellent tool for carrying out the various transformations with ease and under mild reaction conditions. Amidst various transition-metal catalyzed processes available for nucleoside modification, Pd-catalyzed cross-coupling reactions have proven to be perhaps the most efficient, successful, and broadly applicable reactions in both academia and industry. Pd-catalyzed C-C and C-heteroatom bond forming reactions have been widely used for the modification of the heterocyclic moiety in the nucleosides, although a single catalyst system that could address all the different requirements for nucleoside modifications isvery rare or non-existent. With this in mind, we present herein a review showcasing the recent developments and improvements from our research groups toward the development of Pd-catalyzed strategies including drug synthesis using a single efficient catalyst system for the modification of nucleosides and other heterocycles. The review also highlights the improvement in conditions or the yield of various bio-active nucleosides or commercial drugs possessing the nucleoside structural core. Scale ups wherever performed (up to 100 g) of molecules of commercial importance have also been disclosed.
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Affiliation(s)
- Shatrughn Bhilare
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India;
| | - Harshita Shet
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, MouzaSamantpuri, Bhubaneswar 751013, Odisha, India;
| | - Yogesh S. Sanghvi
- Rasayan Inc., 2802, Crystal Ridge Road, Encinitas, CA 92024-6615, USA;
| | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India;
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, MouzaSamantpuri, Bhubaneswar 751013, Odisha, India;
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26
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Choy PY, Yuen OY, Leung MP, Chow WK, Kwong FY. A Highly Efficient Monophosphine Ligand for Parts per Million Levels Pd-Catalyzed Suzuki-Miyaura Coupling of (Hetero)Aryl Chlorides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Pui Ying Choy
- Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; Shenzhen Research Institute; The Chinese University of Hong Kong; No. 10, Second Yuexing Road 518507 Shenzhen P. R. China
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; Shenzhen Research Institute; The Chinese University of Hong Kong; China
| | - On Ying Yuen
- Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; Shenzhen Research Institute; The Chinese University of Hong Kong; No. 10, Second Yuexing Road 518507 Shenzhen P. R. China
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; Shenzhen Research Institute; The Chinese University of Hong Kong; China
| | - Man Pan Leung
- Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; Shenzhen Research Institute; The Chinese University of Hong Kong; No. 10, Second Yuexing Road 518507 Shenzhen P. R. China
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; Shenzhen Research Institute; The Chinese University of Hong Kong; China
| | - Wing Kin Chow
- Shenzhen Research Institute; The Hong Kong Polytechnic University Shenzhen Research Institute (SZRI); 518057 Shenzhen P. R. China
| | - Fuk Yee Kwong
- Shenzhen Municipal Key Laboratory of Chemical Synthesis of Medicinal Organic Molecules; Shenzhen Research Institute; The Chinese University of Hong Kong; No. 10, Second Yuexing Road 518507 Shenzhen P. R. China
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry; Shenzhen Research Institute; The Chinese University of Hong Kong; China
- Shenzhen Research Institute; The Hong Kong Polytechnic University Shenzhen Research Institute (SZRI); 518057 Shenzhen P. R. China
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27
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Liu RY, Dennis JM, Buchwald SL. The Quest for the Ideal Base: Rational Design of a Nickel Precatalyst Enables Mild, Homogeneous C-N Cross-Coupling. J Am Chem Soc 2020; 142:4500-4507. [PMID: 32040909 DOI: 10.1021/jacs.0c00286] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Palladium-catalyzed amination reactions using soluble organic bases have provided a solution to the many issues associated with heterogeneous reaction conditions. Still, homogeneous C-N cross-coupling approaches cannot yet employ bases as weak and economical as trialkylamines. Furthermore, organic base-mediated methods have not been developed for Ni(0/II) catalysis, despite some advantages of such systems over those employing Pd-based catalysts. We designed a new air-stable and easily prepared Ni(II) precatalyst bearing an electron-deficient bidentate phosphine ligand that enables the cross-coupling of aryl triflates with aryl amines using triethylamine (TEA) as base. The method is tolerant of sterically congested coupling partners, as well as those bearing base- and nucleophile-sensitive functional groups. With the aid of density functional theory (DFT) calculations, we determined that the electron-deficient auxiliary ligands decrease both the pKa of the Ni-bound amine and the barrier to reductive elimination from the resultant Ni(II)-amido complex. Moreover, we determined that the preclusion of Lewis acid-base complexation between the Ni catalyst and the base, due to steric factors, is important for avoiding catalyst inhibition.
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Affiliation(s)
- Richard Y Liu
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Joseph M Dennis
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Stephen L Buchwald
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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28
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Ramsingh Girase T, Bhilare S, Sankar Murthy Bandaru S, Chrysochos N, Schulzke C, Sanghvi YS, Kapdi AR. Carbazole‐Based N‐Heterocyclic Carbenes for the Promotion of Copper‐Catalyzed Palladium‐Free Homo‐/Hetero‐Coupling of Alkynes and Sonogashira Reactions. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | - Shatrughn Bhilare
- Department of ChemistryInstitute of Chemical Technology Nathalal Parekh road, Matunga Mumbai 400019 India
| | | | - Nicolas Chrysochos
- Institut für BiochemieUniversität Greifswald Felix-Hausdorff-Straße 4 D-17487 Greifswald Germany
| | - Carola Schulzke
- Institut für BiochemieUniversität Greifswald Felix-Hausdorff-Straße 4 D-17487 Greifswald Germany
| | - Yogesh S. Sanghvi
- Rasayan Inc. 2802, Crystal Ridge Road Encinitas, California 92024-6615 USA
| | - Anant R. Kapdi
- Department of ChemistryInstitute of Chemical Technology Nathalal Parekh road, Matunga Mumbai 400019 India
- Institute of Chemical Technology-Indian Oil Odisha CampusIIT Kharagpur extension Centre Mouza Samantpuri Bhubaneswar 751013, Odisha India
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29
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Reddy MVK, Anusha G, Reddy PVG. Sterically enriched bulky 1,3-bis(N,N′-aralkyl)benzimidazolium based Pd-PEPPSI complexes for Buchwald–Hartwig amination reactions. NEW J CHEM 2020. [DOI: 10.1039/d0nj01294g] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A simple and efficient synthesis of a series of unexisting Pd-PEPPSI complexes is summarized. These complexes are exploited for their high catalytic activity towards Buchwald–Hartwig amination.
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30
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Bhujabal YB, Vadagaonkar KS, Gholap A, Sanghvi YS, Dandela R, Kapdi AR. HFIP Promoted Low-Temperature SNAr of Chloroheteroarenes Using Thiols and Amines. J Org Chem 2019; 84:15343-15354. [DOI: 10.1021/acs.joc.9b02371] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Yuvraj B. Bhujabal
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Kamlesh S. Vadagaonkar
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Aniket Gholap
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Yogesh S. Sanghvi
- Rasayan Incorporation, 2802, Crystal Ridge Road, Encinitas, California 92024-6615, United States
| | - Rambabu Dandela
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, MouzaSamantpuri, Bhubaneswar 751013, Odisha, India
| | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
- Department of Chemistry, Institute of Chemical Technology-Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, MouzaSamantpuri, Bhubaneswar 751013, Odisha, India
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31
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A green and recyclable ligand-free copper (I) catalysis system for amination of halonitrobenzenes in aqueous ammonia solution. MOLECULAR CATALYSIS 2019. [DOI: 10.1016/j.mcat.2019.110462] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Girase TR, Kapdi AR. Novel Carbazole-Based N-Heterocyclic Carbene Ligands to Access Synthetically Relevant Stilbenes in Pd-Catalyzed Coupling Processes. Chem Asian J 2019; 14:2611-2619. [PMID: 31034762 DOI: 10.1002/asia.201900419] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 04/27/2019] [Indexed: 12/21/2022]
Abstract
A series of new carbazole-based N-heterocyclic carbene (NHC) ligands have been synthesized in a simple and facile synthetic route and subsequently used in a Pd/carbazole-based NHC catalytic system, which was found to be effective in catalyzing Heck reactions to provide substituted stilbene derivatives in good yields. Several bioactive stilbenes, including pterostilbene, pinosylvin, trimethoxy resveratrol, and resveratrol, were synthesized in good yields, and a 10 mmol scale-up was also performed for trimethoxy resveratrol. The synthetic application was also extended by performing a double-tandem chemoselective Heck reaction followed by Miyaura borylation in a one-pot procedure to give single-step access to synthetically useful stilbenyl boronate esters. Similarly, a unique triple-tandem protocol of a chemoselective Heck reaction/Miyaura borylation/Suzuki-Miyaura coupling reaction sequence was performed for the one-pot modification of biologically relevant molecules.
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Affiliation(s)
- Tejpalsingh Ramsingh Girase
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Marg Road, Matunga, Mumbai, 400019, India
| | - Anant R Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Marg Road, Matunga, Mumbai, 400019, India
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33
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Beutner GL, Coombs JR, Green RA, Inankur B, Lin D, Qiu J, Roberts F, Simmons EM, Wisniewski SR. Palladium-Catalyzed Amidation and Amination of (Hetero)aryl Chlorides under Homogeneous Conditions Enabled by a Soluble DBU/NaTFA Dual-Base System. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00196] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Gregory L. Beutner
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - John R. Coombs
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Rebecca A. Green
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Bahar Inankur
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Dong Lin
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Jun Qiu
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Frederick Roberts
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Eric M. Simmons
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Steven R. Wisniewski
- Chemical & Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
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34
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Bandaru SSM, Bhilare S, Cardozo J, Chrysochos N, Schulzke C, Sanghvi YS, Gunturu KC, Kapdi AR. Pd/PTABS: Low-Temperature Thioetherification of Chloro(hetero)arenes. J Org Chem 2019; 84:8921-8940. [DOI: 10.1021/acs.joc.9b00840] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
| | - Shatrughn Bhilare
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Jesvita Cardozo
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Nicolas Chrysochos
- Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Straße 4, Greifswald D-17487, Germany
| | - Carola Schulzke
- Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Straße 4, Greifswald D-17487, Germany
| | - Yogesh S. Sanghvi
- Rasayan Inc., 2802 Crystal Ridge Road, Encinitas, California 92024-6615, United States
| | | | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
- Institute of Chemical Technology, Indian Oil Odisha Campus, IIT Kharagpur Extension Centre, Mouza
Samantpuri, Bhubaneswar, Odisha 751013, India
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35
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Bhujabal YB, Vadagaonkar KS, Kapdi AR. Pd/PTABS: Catalyst for Efficient C−H (Hetero)Arylation of 1,3,4-Oxadiazoles Using Bromo(Hetero)Arenes. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201800713] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuvraj B. Bhujabal
- Department of Chemistry; Institute of Chemical Technology Matunga; Mumbai- 400019 India
| | | | - Anant R. Kapdi
- Department of Chemistry; Institute of Chemical Technology Matunga; Mumbai- 400019 India
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36
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Zhang FY, Lan XB, Xu C, Yao HG, Li T, Liu FS. Rigid hindered N-heterocyclic carbene palladium precatalysts: synthesis, characterization and catalytic amination. Org Chem Front 2019. [DOI: 10.1039/c9qo00726a] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Rigid hindered N-heterocyclic carbene palladium complexes have been developed and exhibited high activities for a variety of (hetero)aryl chlorides with (hetero)anilines and amines under aerobic conditions.
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Affiliation(s)
- Fei-Yi Zhang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Xiao-Bing Lan
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Chang Xu
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Hua-Gang Yao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Tian Li
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
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37
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Gupta GR, Shah J, Vadagaonkar KS, Lavekar AG, Kapdi AR. Hetero-bimetallic cooperative catalysis for the synthesis of heteroarenes. Org Biomol Chem 2019; 17:7596-7631. [DOI: 10.1039/c9ob01152h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Review covering the synthesis of 5- and 6-membered as well as condensed heteroarenes, focussing on the combinations in cooperative catalytic systems in strategies used to achieve selectivity and also highlights the mode of action for the cooperative catalysis leading to the synthesis of commercially and biologically relevant heteroarenes.
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Affiliation(s)
- Gaurav R. Gupta
- Department of Chemistry
- Institute of Chemical Technology
- Mumbai-400019
- India
| | - Jagrut Shah
- Department of Chemistry
- Institute of Chemical Technology
- Mumbai-400019
- India
| | | | - Aditya G. Lavekar
- Former Research Fellow
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow-226031
- India
| | - Anant R. Kapdi
- Department of Chemistry
- Institute of Chemical Technology
- Mumbai-400019
- India
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38
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Bhilare S, Murthy Bandaru SS, Shah J, Chrysochos N, Schulzke C, Sanghvi YS, Kapdi AR. Pd/PTABS: Low Temperature Etherification of Chloroheteroarenes. J Org Chem 2018; 83:13088-13102. [DOI: 10.1021/acs.joc.8b01840] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shatrughn Bhilare
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Siva Sankar Murthy Bandaru
- Institut für Biochemie, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Straße 4, D-17487 Greifswald, Germany
| | - Jagrut Shah
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
| | - Nicolas Chrysochos
- Institut für Biochemie, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Straße 4, D-17487 Greifswald, Germany
| | - Carola Schulzke
- Institut für Biochemie, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Straße 4, D-17487 Greifswald, Germany
| | - Yogesh S. Sanghvi
- Rasayan Inc., 2802 Crystal Ridge Road, Encinitas, California 92024-6615, United States
| | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400019, India
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39
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Bhilare S, Bandaru SSM, Kapdi AR, Sanghvi YS, Schulzke C. Pd/PTABS: An Efficient Water-Soluble Catalytic System for the Amination of 6-Chloropurine Ribonucleoside and Synthesis of Alogliptin. ACTA ACUST UNITED AC 2018; 74:e58. [DOI: 10.1002/cpnc.58] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Shatrughn Bhilare
- Department of Chemistry, Institute of Chemical Technology; Mumbai India
| | | | - Anant R. Kapdi
- Department of Chemistry, Institute of Chemical Technology; Mumbai India
| | | | - Carola Schulzke
- Institut für Biochemie, Ernst-Moritz-Arndt-Universität Greifswald; Greifswald Germany
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40
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Thirupathi A, Janni M, Peruncheralathan S. Copper Catalyzed Intramolecular N-Arylation of Ketene Aminals at Room Temperature: Synthesis of 2-Amino-3-cyanoindoles. J Org Chem 2018; 83:8668-8678. [PMID: 29847946 DOI: 10.1021/acs.joc.8b00816] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Various 2-amino-3-cyanoindoles are synthesized through copper catalyzed intramolecular N-arylations of ketene aminals at room temperature for the first time with 60-99% yields within 0.1-2 h. Controlled regioselective N-arylations of unsymmetrical ketene aminals are also studied. Further, a new double heteroannulation approach is demonstrated for the synthesis of 11-aminoindolo[2,3- b]quinolines from acyclic and nonheterocyclic precursors.
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Affiliation(s)
- Annaram Thirupathi
- School of Chemical Sciences , National Institute of Science Education and Research (NISER) Bhubaneswar , HBNI, Jatni , Khurda 752050 , Odisha , India
| | - Manojkumar Janni
- School of Chemical Sciences , National Institute of Science Education and Research (NISER) Bhubaneswar , HBNI, Jatni , Khurda 752050 , Odisha , India
| | - Saravanan Peruncheralathan
- School of Chemical Sciences , National Institute of Science Education and Research (NISER) Bhubaneswar , HBNI, Jatni , Khurda 752050 , Odisha , India
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41
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Sonawane RB, Rasal NK, Bhange DS, Jagtap SV. Copper-(II) Catalyzed N
-Formylation and N
-Acylation of Aromatic, Aliphatic, and Heterocyclic Amines and a Preventive Study in the C-N Cross Coupling of Amines with Aryl Halides. ChemCatChem 2018. [DOI: 10.1002/cctc.201800609] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Rahul B. Sonawane
- Department of Chemistry; Baburaoji Gholap College; Affiliated to Savitribai Phule Pune University; Pune 411027 Sangvi India
| | - Nishant K. Rasal
- Department of Chemistry; Baburaoji Gholap College; Affiliated to Savitribai Phule Pune University; Pune 411027 Sangvi India
| | - Dattatraya S. Bhange
- Department of Chemistry; Baburaoji Gholap College; Affiliated to Savitribai Phule Pune University; Pune 411027 Sangvi India
| | - Sangeeta V. Jagtap
- Department of Chemistry; Baburaoji Gholap College; Affiliated to Savitribai Phule Pune University; Pune 411027 Sangvi India
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42
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Huang FD, Xu C, Lu DD, Shen DS, Li T, Liu FS. Pd-PEPPSI-IPentAn Promoted Deactivated Amination of Aryl Chlorides with Amines under Aerobic Conditions. J Org Chem 2018; 83:9144-9155. [DOI: 10.1021/acs.joc.8b01205] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Fei-Dong Huang
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Chang Xu
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Dong-Dong Lu
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Dong-Sheng Shen
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Tian Li
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering, Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China
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43
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Dennis JM, White NA, Liu RY, Buchwald SL. Breaking the Base Barrier: An Electron-Deficient Palladium Catalyst Enables the Use of a Common Soluble Base in C-N Coupling. J Am Chem Soc 2018; 140:4721-4725. [PMID: 29529363 PMCID: PMC5894476 DOI: 10.1021/jacs.8b01696] [Citation(s) in RCA: 112] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Due to the low intrinsic acidity of amines, palladium-catalyzed C-N cross-coupling has been plagued continuously by the necessity to employ strong, inorganic, or insoluble bases. To surmount the many practical obstacles associated with these reagents, we utilized a commercially available dialkyl triarylmonophosphine-supported palladium catalyst that facilitates a broad range of C-N coupling reactions in the presence of weak, soluble bases. The mild and general reaction conditions show extraordinary tolerance for even highly base-sensitive functional groups. Additionally, insightful heteronuclear NMR studies using 15N-labeled amine complexes provide evidence for the key acidifying effect of the cationic palladium center.
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Affiliation(s)
| | | | - Richard Y. Liu
- Department of Chemistry, Massachusetts Institute of Technology,
Cambridge, Massachusetts 02139, United States
| | - Stephen L. Buchwald
- Department of Chemistry, Massachusetts Institute of Technology,
Cambridge, Massachusetts 02139, United States
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