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Dolcini L, Gandini T, Castiglioni R, Bossi A, Penconi M, Dal Corso A, Gennari C, Pignataro L. Visible Light-Promoted β-Functionalization of Carbonyl Compounds in the Presence of Organic Dyes. J Org Chem 2023; 88:14283-14291. [PMID: 37792665 PMCID: PMC10594657 DOI: 10.1021/acs.joc.3c00890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Indexed: 10/06/2023]
Abstract
Herein, we investigate the use of organic photocatalysts in the visible light-promoted β-functionalization of carbonyl compounds. In particular, we studied the addition of aliphatic aldehydes to α,β-unsaturated compounds (β-Michael addition), and the reaction of cyclic ketones with either ketones (β-aldol condensation) or imines (β-Mannich reaction). Among the dyes tested, donor-acceptor cyanoarenes gave the best results, promoting the transformations of interest in moderate to good yields. The reaction scope was investigated on substrates with different steric and electronic properties. Fluorescence quenching analysis (Stern-Volmer experiments) led us to propose for these reactions a reductive quenching mechanism involving a transient 5πe- activation mode.
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Affiliation(s)
- Luigi Dolcini
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
| | - Tommaso Gandini
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
| | - Riccardo Castiglioni
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
| | - Alberto Bossi
- Istituto
di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC)
del Consiglio Nazionale delle Ricerche (CNR), via Fantoli 16/15; SmartMatLab Center, via C. Golgi
19, Milano 20138, Italy
| | - Marta Penconi
- Istituto
di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC)
del Consiglio Nazionale delle Ricerche (CNR), via Fantoli 16/15; SmartMatLab Center, via C. Golgi
19, Milano 20138, Italy
| | - Alberto Dal Corso
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
| | - Cesare Gennari
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
| | - Luca Pignataro
- Dipartimento
di Chimica, Università degli Studi
di Milano, via C. Golgi 19, Milano 20133, Italy
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3
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Narita K, Suganuma K, Murata T, Kondo R, Satoh H, Watanabe K, Sasaki K, Inoue N, Yoshimura Y. Synthesis and evaluation of trypanocidal activity of derivatives of naturally occurring 2,5-diphenyloxazoles. Bioorg Med Chem 2021; 42:116253. [PMID: 34130218 DOI: 10.1016/j.bmc.2021.116253] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 05/25/2021] [Accepted: 05/28/2021] [Indexed: 10/21/2022]
Abstract
African trypanosomiasis is a zoonotic protozoan disease affecting the nervous system. Various natural products reportedly exhibit trypanocidal activity. Naturally occurring 2,5-diphenyloxazoles present in Oxytropis lanata, and their derivatives, were synthesized. The trypanocidal activities of the synthesized compounds were evaluated against Trypanosoma brucei brucei, T. b. gambiense, T. b. rhodesiense, T. congolense, and T. evansi. Natural product 1 exhibited trypanocidal activity against all the species/subspecies of trypanosomes, exhibiting half-maximal inhibitory concentrations (IC50) of 1.1-13.5 μM. Modification of the oxazole core improved the trypanocidal activity. The 1,3,4-oxadiazole (7) and 2,4-diphenyloxazole (9) analogs exhibited potency superior to that of 1. However, these compounds exhibited cytotoxicity in Madin-Darby bovine kidney cells. The O-methylated analog of 1 (12) was non-cytotoxic and exhibited selective trypanocidal activity against T. congolense (IC50 = 0.78 µM). Structure-activity relationship studies of the 2,5-diphenyloxazole analogs revealed aspects of the molecular structure critical for maintaining selective trypanocidal activity against T. congolense.
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Affiliation(s)
- Koichi Narita
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan.
| | - Keisuke Suganuma
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Toshihiro Murata
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Ryutaro Kondo
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Hiroka Satoh
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Kazuhiro Watanabe
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Kenroh Sasaki
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Noboru Inoue
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
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4
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Greve E, Porter JD, Dockendorff C. Computationally‐Guided Investigation of Dual Amine/pi Lewis Acid Catalysts for Direct Additions of Aldehydes and Ketones to Unactivated Alkenes and Alkynes. ChemistrySelect 2020. [DOI: 10.1002/slct.202001840] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Eric Greve
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
| | - Jacob D. Porter
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
| | - Chris Dockendorff
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
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5
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Recent advances in reactions promoted by amino acids and oligopeptides. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2018-0086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
During the last 20 years, Organocatalysis has become one of the major fields of Catalysis. Herein, we provide a recent overview on reactions where the use of amino acids and peptides as the organocatalysts was employed. All aspects regarding aldol reactions, Michael reactions, epoxidation, Henry reactions and many others that are crucial for the reaction conditions and reaction mechanisms are discussed.
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6
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Fallek A, Portnoy M. The Use of Lewis Acids for Repairing Chemoselectivity of the Organocatalyzed Morita‐Baylis‐Hillman Reaction. ChemistrySelect 2019. [DOI: 10.1002/slct.201900157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Amit Fallek
- School of ChemistryRaymond and Beverly Sackler Faculty of Exact SciencesTel Aviv University Tel Aviv 699678 Israel
| | - Moshe Portnoy
- School of ChemistryRaymond and Beverly Sackler Faculty of Exact SciencesTel Aviv University Tel Aviv 699678 Israel
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7
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DFT-assisted design and evaluation of bifunctional copper(I) catalysts for the direct intermolecular addition of aldehydes and ketones to alkynes. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.07.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Slobodyanyuk EY, Artamonov OS, Kulik IB, Rusanov E, Volochnyuk DM, Grygorenko OO. A bio-inspired approach to proline-derived 2,4-disubstituted oxazoles. HETEROCYCL COMMUN 2018. [DOI: 10.1515/hc-2017-0235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
A convenient four-step approach to the synthesis of (S)-4-alkyl-2-(pyrrolidin-2-yl)oxazoles starting from l-Boc-proline inspired by naturally occurring oxazole-containing peptidomimetics is described. The key step is the cyclization of 1-Boc-N-(1-oxoalkan-2-yl)pyrrolidine-2-carboxamides – aldehyde intermediates which demonstrate low to moderate stability – under Appel reaction conditions. This method furnishes the target compounds with more than 98% ee and in a 17–51% overall yield and has been used at up to a 45-g scale.
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Affiliation(s)
- Evgeniy Y. Slobodyanyuk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Oleksiy S. Artamonov
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Irene B. Kulik
- Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Eduard Rusanov
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Dmitriy M. Volochnyuk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Oleksandr O. Grygorenko
- National Taras Shevchenko University of Kyiv , Volodymyrska Street, 64 , Kyiv 01601 , Ukraine
- Enamine Ltd. , Chervonotkatska 78 , Kyiv 02094 , Ukraine
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9
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Tanemura K, Suzuki T. Base-catalyzed reactions enhanced by solid acids: Amine-catalyzed nitroaldol (Henry) reactions enhanced by silica gel or mesoporous silica SBA-15. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2017.12.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Yamashita Y, Yasukawa T, Yoo WJ, Kitanosono T, Kobayashi S. Catalytic enantioselective aldol reactions. Chem Soc Rev 2018; 47:4388-4480. [DOI: 10.1039/c7cs00824d] [Citation(s) in RCA: 165] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent developments in catalytic asymmetric aldol reactions have been summarized.
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Affiliation(s)
- Yasuhiro Yamashita
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Tomohiro Yasukawa
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Woo-Jin Yoo
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Taku Kitanosono
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Shū Kobayashi
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
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