Article
Chemistry, Organic
Zhuang Xiong, Chun-Mei Hu, Wen-Jian Zhu, Si-Min Wu, Dan Wang, Yang Liu, Jing Lin, Suqin Guo, Jia-Qiang Wu, Xue-Tao Xu
Summary: Efficient access to lactam-derived quinoline has been achieved through a bicyclic amidine-triggered cyclization reaction from readily prepared o-alkynylisocyanobenzenes. The reaction involves nucleophilic attack of bicyclic amidines to o-alkynylisocyanobenzenes, followed by intramolecular cyclization to produce a DBU-quinoline-based amidinium salt. Hydrolysis of the salt then gives the desired lactam-derived quinoline in moderate to good yields.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Biotechnology & Applied Microbiology
Purna Bahadur Poudel, Ramesh Prasad Pandey, Dipesh Dhakal, Tae-Su Kim, Trang Thi Huyen Nguyen, Hye Jin Jung, Hee Jeong Shin, Binod Timalsina, Jae Kyung Sohng
Summary: In this study, a sugar-O-methyltransferase ThnM1 was identified and functionally characterized. The enzyme showed promiscuity and regiospecific activity at the 2'-OH of rhamnose. By using engineered Escherichia coli, a methoxy-rhamnosyl derivative of quinizarin was successfully produced. The cytotoxicity of the derivative was studied and compared with that of quinizarin. This study provides insights into the potential diversification of natural products through the methylation of the rhamnose moiety.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Chemistry, Organic
Ekaterina E. Galenko, Timur O. Zanakhov, Mikhail S. Novikov, Alexander F. Khlebnikov
Summary: Various substituted isoxazolo[5,4-c]quinolines can be easily synthesized in high yields by Pd-catalyzed heteroannulation of 5-carbonyl-4-haloisoxazoles with 2-aminophenylboronic acid derivatives. 4-Unsubstituted isoxazolo[5,4-c]quinolines can be readily modified at C4 through a chlorination/substitution sequence.
TETRAHEDRON LETTERS
(2023)
Article
Chemistry, Organic
Zhi Zhang, Jing-Tong Deng, Jia-Yi Feng, Jin-Yan Liang, Xue-Tao Xu, Jin-Bao Peng
Summary: A palladium-catalyzed annulation of o-iodo-anilines with propargyl alcohols for the synthesis of substituted quinolines has been developed. The reaction shows tolerance towards diverse functional groups under mild conditions, providing a direct access to 2,4-disubstituted quinolines from easily available starting materials. A broad range of 2,4-disubstituted quinolines were efficiently synthesized in good to excellent yields.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yangming Ding, Tenglong Guo, Zhewei Li, Bo Zhang, Fritz E. Kuhn, Chang Liu, Jian Zhang, Dezhu Xu, Ming Lei, Tao Zhang, Changzhi Li
Summary: A one-pot cascade reaction was developed for the synthesis of quinoline from beta-O-4 model compounds, achieving high yields. The reaction pathway involves selective cleavage of C-O bonds, dehydrogenation, aldol condensation, and C-N bond formation.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Thikhamporn Uppalabat, Anyawan Tapdara, Onnicha Khaikate, Thanapat Worakul, Panida Surawatanawong, Pawaret Leowanawat, Darunee Soorukram, Vichai Reutrakul, Jatuporn Meesin, Chutima Kuhakarn
Summary: A highly efficient synthesis of indolo[3,2-c]quinolines and benzothieno[3,2-c]quinolines has been developed using o-alkynyl-N-phenylformamide derivatives as substrates. The reaction proceeds through a tandem process involving POCl3-assisted intramolecular cyclization of o-alkynylisocyanobenzenes, leading to the desired products in moderate to high yields. The synthesized products can be further modified, and the photophysical properties of selected indolo[3,2-c]quinolines were characterized and explained using time-dependent DFT calculations.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Applied
Ben-Jie Jiang, Song-Lin Zhang
Summary: A general method is developed for the synthesis of quinolines and C2-functionalized quinolines from ortho-alkenyl anilines using a difluorocarbene precursor. The method involves the in-situ generation of isocyanides from primary aniline and difluorocarbene, which then undergo alpha-addition by neighboring alkenyl groups to form the quinoline ring. In the presence of Se, selenoisocyanate intermediates are generated, leading to the synthesis of 2-SeH quinolines. The method allows for the modular synthesis of various C2-functionalized quinolines in one step, using readily available starting compounds.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Article
Chemistry, Organic
Juulia Talvitie, Iida Alanko, Evgeny Bulatov, Juho Koivula, Topias Pollanen, Juho Helaja
Summary: By using visible-light-excited 9,10-phenanthrenequinone (PQ*) as a photocatalyst, polysubstituted quinolines were successfully synthesized via the electrocyclization of 2-vinylarylimines. Experimental results showed that quantitative yields of 2,4-disubstituted quinolines could be obtained in a short period of time under blue LEDs excitation with the presence of MgCO3.
Article
Biochemistry & Molecular Biology
Thomas Bohme, Mari Egeland, Marianne Lorentzen, Mohamed F. Mady, Michelle F. Solbakk, Krister S. Saebo, Kare B. Jorgensen
Summary: Methylated polycyclic aromatic hydrocarbons (PAHs) are suspected to be toxic to marine life and are required for environmental studies. In this study, 1-, 3-, 6-methylchrysene were synthesized as single isomers using photochemical cyclization, while 2-methylchrysene was prepared by controlling the regioselectivity. The methylchrysenes were further oxidized to chrysenecarboxylic acids.
Article
Chemistry, Organic
Vasiliy M. Muzalevskiy, Zoia A. Sizova, Vladimir T. Abaev, Valentine G. Nenajdenko
Summary: In this study, alpha-CF3-enamines were prepared and subsequently reacted with 2-nitrobenzaldehydes to yield ortho-nitro-substituted alpha,beta-diaryl-CF3-enones and 2-CF3-3-arylquinolines with high stereoselectivity and yield. A one-pot procedure was also developed to directly synthesize trifluoromethylated quinolines from enamines or haloalkenes, showcasing the high synthetic utility of the synthetic steps in this sequence.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Chemistry, Organic
Jinhuan Dong, Lei Wang, Haoyue Li, Xinrong Leng, Xiaoyu Guo, Zhongyan Hu, Xianxiu Xu
Summary: A new method for solvent-dependent chemoselective Morita-Baylis-Hillman-type self-cyclization and dimerization of o-alkenyl arylisocyanides was developed, providing concise access to various 3-acylquinoline and pyrrolo[1,2-a:3,4-b ']diindole frameworks via distinct domino processes from the same starting materials.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Biochemistry & Molecular Biology
Shumin Bao, Ling Luo, Ying Wan, Kangping Xu, Guishan Tan, Jie Fan, Shu-Ming Li, Xia Yu
Summary: In this article, the first example of prenylation of anthocyanins is demonstrated using a chemo-enzymatic approach with the fungal prenyltransferase CdpC3PT from Neosartorya fischeri. The synthesis resulted in a series of 7-O-prenylated anthocyanins which have potential for various beneficial health effects.
BIOORGANIC CHEMISTRY
(2021)
Review
Chemistry, Organic
Ajay Kumar Dhiya, Aparna Monga, Anuj Sharma
Summary: Quinolines are widely used in various fields, but traditional synthesis methods have drawbacks, prompting the shift towards light-catalyzed synthesis. This review focuses on recent research on the synthesis of quinolines using visible light.
ORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Applied
Santosh J. Gharpure, Santosh K. Nanda, Dipak J. Fartade
Summary: This study demonstrates a facile synthesis of 1,4-heterocycle-fused quinoline motifs through intramolecular formal [4+2]-cycloaddition, involving tandem bond formation reactions and showing excellent functional group tolerance, leading to the synthesis of enantiomerically enriched compounds. Additionally, sulfoxide embedded quinolines were successfully transformed into pentacyclic 1,4-thiepino tethered indeno-quinoline scaffolds via Pummerer cyclization.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Applied
Mikko K. Makela, Evgeny Bulatov, Kiia Malinen, Juulia Talvitie, Martin Nieger, Michele Melchionna, Anna Lenarda, Tao Hu, Tom Wirtanen, Juho Helaja
Summary: Oxidized active carbon catalyzes the formation of polysubstituted quinolines through a cascade manner involving condensation, electrocyclization, and dehydrogenation, allowing access to a wide range of quinolines. The metal-free catalytic procedure provides a heterogeneous protocol for the synthesis of various polysubstituted quinolines, with mechanistic studies indicating the importance of acid and quinoidic groups in oAC for the catalytic reaction.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Adam I. Green, Christopher P. Tinworth, Stuart Warriner, Adam Nelson, Natalie Fey
Summary: Dirhodium(II) catalysts have diverse properties, and a database based on DFT-calculated parameters has been developed to aid in catalyst selection and exploration of reactivity.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Applied
Daniel Francis, A. John Blacker, Nikil Kapur, Stephen P. Marsden
Summary: The new modular photochemical continuous stirred-tank reactor (CSTR) design utilizes light-source units developed for the fReactor CSTR platform, making it suitable for both homogeneous and multiphasic reactions. By using slurries as input feeds, the system intensifies photochemical brominations, and its modular nature facilitates the integration of downstream reaction steps.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2022)
Article
Chemistry, Medicinal
Chloe Townley, Lindsay McMurray, Stephen P. Marsden, Adam Nelson
Summary: A top-down synthetic approach was used to efficiently synthesize 21 diverse novel molecular scaffolds, which were derived from complex intermediates prepared using cycloaddition chemistry. Scaffold-hopping of these intermediates was achieved through ring attachment, cleavage, expansion, and/or fusion, leading to the generation of diverse lead-like screening compounds.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Organic
Tarn C. Johnson, Stephen P. Marsden
Summary: A convenient and simple three-component synthesis of substituted pyridylacetic acid derivatives is reported. The method utilizes the dual reactivity of Meldrum's acid derivatives, first as nucleophiles to substitute activated pyridine-N-oxides, and then as electrophiles with a range of nucleophiles to induce ring-opening and decarboxylation.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Anthony Aimon, Mark J. Dow, Abigail R. Hanby, Ephraim A. Okolo, Christopher M. Pask, Adam Nelson, Stephen P. Marsden
Summary: The stereocontrolled synthesis of complex spirotricyclic systems containing an embedded syn-1,2-diaminocyclohexane unit is achieved through a dearomatising oxidation of phenols bearing pendant ureas capable of acting as double nucleophiles. The resultant products possess rich functionality suitable for the synthesis of potentially bioactive compounds.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ephraim A. Okolo, Axel Pahl, Sonja Sievers, Christopher M. Pask, Adam Nelson, Stephen P. Marsden
Summary: A 'top down' scaffold remodelling approach was used to synthesize a library of spirotricyclic ureas via complexity-generating oxidative dearomatisation. Eighteen structurally distinct, sp(3)-rich scaffolds were obtained from the parent tricycle through ring addition, cleavage, and expansion strategies. Biological screening of the compound library based on these scaffolds revealed diverse phenotypic responses, highlighting both functional and structural diversity of the compounds.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Alexandra Hindle, Krzysztof Baj, Jonathan A. Iggo, Daniel J. Cox, Christopher M. Pask, Adam Nelson, Stephen P. Marsden
Summary: A convergent approach to diazabicyclic scaffolds containing twisted amides or anilines is achieved through photocatalysed hydroamination and subsequent cyclisation of cyclic enecarbamates. The modular synthesis enables variation of the degree of twist and consequently the properties of the amides and anilines.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Daniel Francis, Sannia Farooque, Archie Meager, Didi Derks, Abbie Leggott, Stuart Warriner, Alex J. O'Neill, Adam Nelson
Summary: Activity-directed synthesis (ADS) is a function-driven method for discovering bioactive small molecules. In this study, algorithms were developed to design arrays of photoredox-catalysed alkylation reactions based on similarity to known bioactive reactions. The approach successfully expanded a series of antibacterial quinazolinones.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mary E. Bayana, J. Steven Wailes, Stephen P. Marsden
Summary: A two-step process has been developed to rapidly access diverse tri- and tetrasubstituted pyridines by utilizing a range of reactants.
Article
Biochemistry & Molecular Biology
Kristina Hetherington, Som Dutt, Amaurys A. Ibarra, Emma E. Cawood, Fruzsina Hobor, Derek N. Woolfson, Thomas A. Edwards, Adam Nelson, Richard B. Sessions, Andrew J. Wilson
Summary: The study introduces a computationally validated workflow for modifying the sequence of peptide inhibitors of protein-protein interactions.
RSC CHEMICAL BIOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Samuel D. Griggs, Alejandro Martin-Roncero, Adam Nelson, Stephen P. Marsden
Summary: This study reports a regioselective gamma-C-H amination method for the side-chain of saturated 2-alkyl nitrogen heterocycles, which proceeds through a sulfamide-directed 1,6-radical translocation. The practicality of this rapid access to 1,3-diamines is highlighted in a short synthesis of the alkaloid tetraponerine T8 and non-natural analogues.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Scott Rice, Daniel J. Cox, Stephen P. Marsden, Adam Nelson
Summary: Regioselective and stereospecific directed C-H arylation of simple amine substrates, followed by cyclisation, resulted in the synthesis of 30 diverse, three-dimensional scaffolds. This unified approach significantly expanded the range of bridged ring systems containing both a nitrogen atom and an aromatic ring.
CHEMICAL COMMUNICATIONS
(2021)