1
|
Beč A, Zlatić K, Banjanac M, Radovanović V, Starčević K, Kralj M, Hranjec M. Design, Synthesis and Biological Activity of Novel Methoxy- and Hydroxy-Substituted N-Benzimidazole-Derived Carboxamides. Molecules 2024; 29:2138. [PMID: 38731629 PMCID: PMC11085308 DOI: 10.3390/molecules29092138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/25/2024] [Accepted: 04/25/2024] [Indexed: 05/13/2024] Open
Abstract
This work presents the design, synthesis and biological activity of novel N-substituted benzimidazole carboxamides bearing either a variable number of methoxy and/or hydroxy groups. The targeted carboxamides were designed to investigate the influence of the number of methoxy and/or hydroxy groups, the type of substituent placed on the N atom of the benzimidazole core and the type of substituent placed on the benzimidazole core on biological activity. The most promising derivatives with pronounced antiproliferative activity proved to be N-methyl-substituted derivatives with hydroxyl and methoxy groups at the phenyl ring and cyano groups on the benzimidazole nuclei with selective activity against the MCF-7 cell line (IC50 = 3.1 μM). In addition, the cyano-substituted derivatives 10 and 11 showed strong antiproliferative activity against the tested cells (IC50 = 1.2-5.3 μM). Several tested compounds showed significantly improved antioxidative activity in all three methods compared to standard BHT. In addition, the antioxidative activity of 9, 10, 32 and 36 in the cells generally confirmed their antioxidant ability demonstrated in vitro. However, their antiproliferative activity was not related to their ability to inhibit oxidative stress nor to their ability to induce it. Compound 8 with two hydroxy and one methoxy group on the phenyl ring showed the strongest antibacterial activity against the Gram-positive strain E. faecalis (MIC = 8 μM).
Collapse
Affiliation(s)
- Anja Beč
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev Trg 19, 10000 Zagreb, Croatia;
| | - Katarina Zlatić
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia; (K.Z.); (M.K.)
| | - Mihailo Banjanac
- Pharmacology In Vitro, Selvita Ltd., Prilaz baruna Filipovića 29, 10000 Zagreb, Croatia; (M.B.); (V.R.)
| | - Vedrana Radovanović
- Pharmacology In Vitro, Selvita Ltd., Prilaz baruna Filipovića 29, 10000 Zagreb, Croatia; (M.B.); (V.R.)
| | - Kristina Starčević
- Department of Chemistry and Biochemistry, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia;
| | - Marijeta Kralj
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia; (K.Z.); (M.K.)
| | - Marijana Hranjec
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev Trg 19, 10000 Zagreb, Croatia;
| |
Collapse
|
2
|
Exploiting photoredox catalysis for carbohydrate modification through C–H and C–C bond activation. Nat Rev Chem 2022; 6:782-805. [PMID: 37118094 DOI: 10.1038/s41570-022-00422-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/12/2022] [Indexed: 11/09/2022]
Abstract
Photoredox catalysis has recently emerged as a powerful synthetic platform for accessing complex chemical structures through non-traditional bond disconnection strategies that proceed through free-radical intermediates. Such synthetic strategies have been used for a range of organic transformations; however, in carbohydrate chemistry they have primarily been applied to the generation of oxocarbenium ion intermediates in the ubiquitous glycosylation reaction. In this Review, we present more intricate light-induced synthetic strategies to modify native carbohydrates through homolytic C-H and C-C bond cleavage. These strategies allow access to glycans and glycoconjugates with profoundly altered carbohydrate skeletons, which are challenging to obtain through conventional synthetic means. Carbohydrate derivatives with such structural motifs represent a broad class of natural products integral to numerous biochemical processes and can be found in active pharmaceutical substances. Here we present progress made in C-H and C-C bond activation of carbohydrates through photoredox catalysis, focusing on the operational mechanisms and the scope of the described methodologies.
Collapse
|
3
|
Bach T, Gilbert A. The Awakening of a Sleeping Beauty: The ortho Photocycloaddition in the Total Synthesis of Protoilludane- and Prezizaene-Type Sesquiterpenes. Synlett 2022. [DOI: 10.1055/s-0042-1751354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
AbstractPhotochemical cascade (domino) reactions provide a unique opportunity for the construction of complex molecular architectures. Specifically, an intramolecular ortho photocycloaddition of 7-(alkenyloxy)-indanones triggers a sequence of consecutive reactions that can lead in a single operation to the complete skeleton of two important classes of sesquiterpenes: protoilludanes and prezizaenes. In the former case, two transformations follow the initial photocycloaddition, while in the latter case, there are three consecutive transformations, two of which are initiated by a photon. Remarkably, the reaction cascades proceed with exquisite diastereoselectivity, generating three (protoilludane) or five (prezizaene) stereogenic centers with defined relative configurations.1 Introduction2 First Encounter and Initial Studies3 Protoilludane-Type Sesquiterpenes4 Prezizaene-Type Sesquiterpenes5 Enantioselectivity6 Perspective and Summary
Collapse
|
4
|
Montes AS, León EI, Martin A, Pérez-Martín I, Suárez E. Free‐Radical Epimerization of D‐ into L‐C‐(glycosyl)methanol Compounds Using 1,5‐Hydrogen Atom Transfer Reaction. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Adrián S. Montes
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Elisa I León
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Angeles Martin
- Instituto de Productos Naturales Y Agrobiolog�a, CSIC Sintesis de Productos Naturales Avda. Astrofisico Fco. Sanchez 3 38205 La Laguna SPAIN
| | - Inés Pérez-Martín
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| | - Ernesto Suárez
- IPNA: Instituto de Productos Naturales y Agrobiologia Síntesis de Productos Naturales Avda. Astrofisico Francisco Sanchez 3 38206 La Laguna SPAIN
| |
Collapse
|
5
|
Petitpoisson L, Pichette A, Alsarraf J. Towards better syntheses of partially methylated carbohydrates? Org Chem Front 2022. [DOI: 10.1039/d2qo00893a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We give an overview of the reported synthetic strategies towards partially methylated glycosides and discuss how better protocols could stem from catalytic site-selective transformations of carbohydrates and cleaner methylation reagents.
Collapse
Affiliation(s)
- Lucas Petitpoisson
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
| | - André Pichette
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
| | - Jérôme Alsarraf
- Centre de recherche sur la boréalie (CREB), Laboratoire d'analyse et de séparation des essences végétales (LASEVE), Université du Québec à Chicoutimi, 555 boulevard de l'Université, Chicoutimi G7H 2B1, Québec, Canada
| |
Collapse
|
6
|
Santana AG, Herrera AJ, González CC. Intramolecular Metal-Free C(sp 3)-H Activation Enables a Selective Mono O-Debenzylation of Fully Protected Aminosugars. J Org Chem 2021; 86:16736-16752. [PMID: 34807601 DOI: 10.1021/acs.joc.1c01977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carbamate-bearing benzylated aminosugars undergo an I2/I(III)-promoted intramolecular hydrogen atom transfer (IHAT) followed by a nucleophilic attack to provide polycyclic structures. Thus, suitably positioned benzyl ethers are surgically oxidized into the corresponding mixed N/O-benzylidene acetals, which can be conveniently deprotected under mild acidic conditions to grant access to selectively O-deprotected aminosugars amenable for further derivatization. The scope of this strategy has been proven with a series of furanosic and pyranosic scaffolds. Preliminary mechanistic studies, including Hammett LFER and KIE analyses, support a reaction pathway with nucleophilic cyclization as the rate-determining step.
Collapse
Affiliation(s)
- Andrés G Santana
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Antonio J Herrera
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Concepción C González
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| |
Collapse
|
7
|
Rauscher N, Næsborg L, Jandl C, Bach T. Concise Total Synthesis of Agarozizanol B via a Strained Photocascade Intermediate. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202110009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Niklas Rauscher
- Technische Universität München School of Natural Sciences Department of Chemistry and Catalysis Research Center Lichtenbergstrasse 4 85747 Garching Germany
| | - Line Næsborg
- Technische Universität München School of Natural Sciences Department of Chemistry and Catalysis Research Center Lichtenbergstrasse 4 85747 Garching Germany
| | - Christian Jandl
- Technische Universität München School of Natural Sciences Department of Chemistry and Catalysis Research Center Lichtenbergstrasse 4 85747 Garching Germany
| | - Thorsten Bach
- Technische Universität München School of Natural Sciences Department of Chemistry and Catalysis Research Center Lichtenbergstrasse 4 85747 Garching Germany
| |
Collapse
|
8
|
Rauscher N, Næsborg L, Jandl C, Bach T. Concise Total Synthesis of Agarozizanol B via a Strained Photocascade Intermediate. Angew Chem Int Ed Engl 2021; 60:24039-24042. [PMID: 34519408 PMCID: PMC8596452 DOI: 10.1002/anie.202110009] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Indexed: 11/22/2022]
Abstract
The prezizane-type sesquiterpene agarozizanol B was synthesized employing a photochemical cascade reaction as the key step. Starting from a readily available 1-indanone with a tethered olefin, a strained tetracyclic skeleton was assembled which contained all carbon atoms of the sesquiterpene with the correct relative configuration. The conversion into the tricyclic prezizane skeleton was accomplished by a strategic cyclopropane bond cleavage. Prior to the cyclopropane ring opening an adaption of the oxidation state was required, which could be combined with a reductive resolution step. After removal of two functional groups, the natural product was obtained both in racemic form or, if resolved, as the (+)-enantiomer which was shown to be identical to the natural product.
Collapse
Affiliation(s)
- Niklas Rauscher
- Technische Universität MünchenSchool of Natural SciencesDepartment of Chemistry and Catalysis Research CenterLichtenbergstrasse 485747GarchingGermany
| | - Line Næsborg
- Technische Universität MünchenSchool of Natural SciencesDepartment of Chemistry and Catalysis Research CenterLichtenbergstrasse 485747GarchingGermany
| | - Christian Jandl
- Technische Universität MünchenSchool of Natural SciencesDepartment of Chemistry and Catalysis Research CenterLichtenbergstrasse 485747GarchingGermany
| | - Thorsten Bach
- Technische Universität MünchenSchool of Natural SciencesDepartment of Chemistry and Catalysis Research CenterLichtenbergstrasse 485747GarchingGermany
| |
Collapse
|
9
|
Jones CAH, Schley ND. Selective demethylation of O-aryl glycosides by iridium-catalyzed hydrosilylation. Chem Commun (Camb) 2021; 57:5953-5956. [PMID: 34019603 DOI: 10.1039/d1cc00496d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The cleavage of alkyl ethers by hydrosilylation is a powerful synthetic tool for the generation of silyl ethers. Previous attempts to apply this transformation to carbohydrate derivatives have been constrained by poor selectivity and preferential reduction of the anomeric position. O-Aryl glycosides are found to be stable under iridium- and borane-catalyzed hydrosilylation conditions, allowing for alkyl ether cleavage without loss of anomeric functionality. A cationic bis(phosphine)iridium complex catalyzes the selective 3-demethylation of a variety of 2,3,4-tri-O-methyl pyranoses, offering a unique approach to 3-hydroxy or 3-acetyl 2,4-di-O-methylpyranoses.
Collapse
Affiliation(s)
- Caleb A H Jones
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA.
| | - Nathan D Schley
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA.
| |
Collapse
|
10
|
Zhou X, Ding H, Chen P, Liu L, Sun Q, Wang X, Wang P, Lv Z, Li M. Radical Dehydroxymethylative Fluorination of Carbohydrates and Divergent Transformations of the Resulting Reverse Glycosyl Fluorides. Angew Chem Int Ed Engl 2020; 59:4138-4144. [PMID: 31850616 DOI: 10.1002/anie.201914557] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Indexed: 12/22/2022]
Abstract
A mild and convenient method for the synthesis of reverse glycosyl fluorides (RGFs) has been developed that is based on the silver-promoted radical dehydroxymethylative fluorination of carbohydrates. A salient feature of the reaction is that furanoid and pyranoid carbohydrates furnish structurally diverse RGFs bearing a wide variety of functional groups in good to excellent yields. Intramolecular hydrogen atom transfer experiments revealed that the reaction involves an underexploited radical fluorination that proceeds via β-fragmentation of sugar-derived primary alkoxyl radicals. Structurally divergent RGFs were obtained by catalytic C-F bond activation, and our method thus offers a concise and efficient strategy for the synthesis of reverse glycosides by late-stage diversification of RGFs. The potential of this method is showcased by the preparation and diversification of sotagliflozin, leading to the discovery of a promising SGLT2 inhibitor candidate.
Collapse
Affiliation(s)
- Xin Zhou
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Han Ding
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Pengwei Chen
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Hainan Key Laboratory for Research and Development of Natural Products from Li Folk Medicine, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, P. R. China
| | - Li Liu
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Qikai Sun
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Xianyang Wang
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Peng Wang
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China
| | - Zhihua Lv
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, P. R. China
| | - Ming Li
- School of Medicine and Pharmacy, Key Laboratory of Marine Medicine, Chinese Ministry of Education, Ocean University of China, 5 Yushan Road, Qingdao, 266003, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, P. R. China
| |
Collapse
|
11
|
Zhou X, Ding H, Chen P, Liu L, Sun Q, Wang X, Wang P, Lv Z, Li M. Radical Dehydroxymethylative Fluorination of Carbohydrates and Divergent Transformations of the Resulting Reverse Glycosyl Fluorides. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914557] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xin Zhou
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Han Ding
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Pengwei Chen
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Hainan Key Laboratory for Research and Development of Natural Products from Li Folk Medicine Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 P. R. China
| | - Li Liu
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Qikai Sun
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Xianyang Wang
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Peng Wang
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
| | - Zhihua Lv
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 P. R. China
| | - Ming Li
- School of Medicine and Pharmacy Key Laboratory of Marine Medicine Chinese Ministry of Education Ocean University of China 5 Yushan Road Qingdao 266003 P. R. China
- Laboratory for Marine Drugs and Bioproducts Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 P. R. China
| |
Collapse
|
12
|
Zech A, Jandl C, Bach T. Concise Access to the Skeleton of Protoilludane Sesquiterpenes through a Photochemical Reaction Cascade: Total Synthesis of Atlanticone C. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908619] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andreas Zech
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstr. 4 85747 Garching Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstr. 4 85747 Garching Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstr. 4 85747 Garching Germany
| |
Collapse
|
13
|
Zech A, Jandl C, Bach T. Concise Access to the Skeleton of Protoilludane Sesquiterpenes through a Photochemical Reaction Cascade: Total Synthesis of Atlanticone C. Angew Chem Int Ed Engl 2019; 58:14629-14632. [PMID: 31478314 PMCID: PMC7687024 DOI: 10.1002/anie.201908619] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Indexed: 01/03/2023]
Abstract
In a single photochemical operation (λ≥350 nm) an easily accessible indanone derivative was converted into a structurally complex precursor of the protoilludane sesquiterpenes. The product (60 % yield) contains all 15 carbon atoms of the skeleton in the required connectivity and was transformed into the natural product atlanticone C (9 steps, 6 % overall yield). In addition, it was shown that other protoilludanes, such as Δ6 -protoilludene and paesslerin A, can be prepared in a concise fashion via the photochemical key intermediate. The photochemical reaction cascade comprises an ortho photocycloaddition, a thermal disrotatory ring opening and a regioselective disrotatory [4π] photocyclization.
Collapse
Affiliation(s)
- Andreas Zech
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstr. 4, 85747, Garching, Germany
| |
Collapse
|
14
|
Zhou X, Wang P, Zhang L, Chen P, Ma M, Song N, Ren S, Li M. Transition-Metal-Free Synthesis of C-Glycosylated Phenanthridines via K 2S 2O 8-Mediated Oxidative Radical Decarboxylation of Uronic Acids. J Org Chem 2018; 83:588-603. [PMID: 29261315 DOI: 10.1021/acs.joc.7b02346] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have developed an efficient protocol for the synthesis of C-glycosylated phenanthridines. Tetrafuranos-4-yl and pentapyranos-5-yl radicals, generated from K2S2O8-mediated oxidative decarboxylation of furan- and pyranuronic acids, undergo attack to 2-isocyanodiphenyls and ensuing homolytic aromatic substitution to provide diverse C-glycosylated phenanthridines in satisfactory yields without resort to transition metals. This reaction tolerates various functional groups, and enables ready synthesis of complex oligosaccharide-based phenanthridines. The C-glycosylated phenanthridine derived from β-cyclodextrin has been prepared, which might be potential in medicinal and biological chemistry due to its flexible conformation.
Collapse
Affiliation(s)
- Xin Zhou
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Peng Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Li Zhang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Pengwei Chen
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Mingxu Ma
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Ni Song
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Sumei Ren
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China
| | - Ming Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, People's Republic of China.,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology , Qingdao 266237, People's Republic of China
| |
Collapse
|
15
|
Saavedra CJ, Hernández D, Boto A. Metal-Free, Site-Selective Peptide Modification by Conversion of “Customizable” Units into β-Substituted Dehydroamino Acids. Chemistry 2017; 24:599-607. [DOI: 10.1002/chem.201703758] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Carlos J. Saavedra
- Instituto de Productos Naturales y Agrobiología, CSIC (Spanish Research Council); Avda. Astrofísico Fco. Sánchez 3 38206 La Laguna Tenerife SPAIN
| | - Dácil Hernández
- Instituto de Productos Naturales y Agrobiología, CSIC (Spanish Research Council); Avda. Astrofísico Fco. Sánchez 3 38206 La Laguna Tenerife SPAIN
| | - Alicia Boto
- Instituto de Productos Naturales y Agrobiología, CSIC (Spanish Research Council); Avda. Astrofísico Fco. Sánchez 3 38206 La Laguna Tenerife SPAIN
| |
Collapse
|
16
|
Traboni S, Bedini E, Iadonisi A. Orthogonal protection of saccharide polyols through solvent-free one-pot sequences based on regioselective silylations. Beilstein J Org Chem 2016; 12:2748-2756. [PMID: 28144345 PMCID: PMC5238545 DOI: 10.3762/bjoc.12.271] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/30/2016] [Indexed: 11/23/2022] Open
Abstract
tert-Butyldimethylsilyl (TBDMS) and tert-butyldiphenylsilyl (TBDPS) are alcohol protecting groups widely employed in organic synthesis in view of their compatibility with a wide range of conditions. Their regioselective installation on polyols generally requires lengthy reactions and the use of high boiling solvents. In the first part of this paper we demonstrate that regioselective silylation of sugar polyols can be conducted in short times with the requisite silyl chloride and a very limited excess of pyridine (2-3 equivalents). Under these conditions, that can be regarded as solvent-free conditions in view of the insolubility of the polyol substrates, the reactions are faster than in most examples reported in the literature, and can even be further accelerated with a catalytic amount of tetrabutylammonium bromide (TBAB). The strategy proved also useful for either the selective TBDMS protection of secondary alcohols or the fast per-O-trimethylsilylation of saccharide polyols. In the second part of the paper the scope of the silylation approach was significantly extended with the development of unprecedented "one-pot" and "solvent-free" sequences allowing the regioselective silylation/alkylation (or the reverse sequence) of saccharide polyols in short times. The developed methodologies represent a very useful and experimentally simple tool for the straightforward access to saccharide building-blocks useful in organic synthesis.
Collapse
Affiliation(s)
- Serena Traboni
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126, Naples, Italy
| | - Emiliano Bedini
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126, Naples, Italy
| | - Alfonso Iadonisi
- Department of Chemical Sciences, University of Naples Federico II, Via Cinthia 4, 80126, Naples, Italy
| |
Collapse
|
17
|
Alvarez-Dorta D, León EI, Kennedy AR, Martín A, Pérez-Martín I, Suárez E. Radical-Mediated C-H Functionalization: A Strategy for Access to Modified Cyclodextrins. J Org Chem 2016; 81:11766-11787. [PMID: 27806207 DOI: 10.1021/acs.joc.6b02241] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple and efficient radical C-H functionalization to access modified cyclodextrins (CDs) has been developed. The well-defined conformation of glycosidic and aglyconic bonds in α-, β-, and γ-CDs favors the intramolecular 1,8-hydrogen atom transfer (HAT) promoted by the 6I-O-yl radical, which abstracts regioselectively the hydrogen at C5II of the contiguous pyranose. The C5II-radical evolves by a polar crossover mechanism to a stable 1,3,5-trioxocane ring between two adjacent glucoses or alternatively triggers the inversion of one α-d-glucose into a 5-C-acetoxy-β-l-idose unit possessing a 1C4 conformation. The 6I,IV- and 6I,III-diols of α- and β-CDs behave similarly to the monoalcohols, forming mostly compounds originating from two 1,8-HAT consecutive processes. In the case of 6I,II-diols the proximity of the two 6-O-yl radicals in adjacent sugar units allows the formation of unique lactone rings within the CD framework via a 1,8-HAT-β-scission tandem mechanism. X-ray diffraction carried out on the crystalline 1,4-bis(trioxocane)-α-CD derivative shows a severe distortion toward a narrower elliptical shape for the primary face.
Collapse
Affiliation(s)
- Dimitri Alvarez-Dorta
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC , Carretera de La Esperanza 3, 38206, La Laguna, Tenerife, Spain
| | - Elisa I León
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC , Carretera de La Esperanza 3, 38206, La Laguna, Tenerife, Spain
| | - Alan R Kennedy
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde , 295 Cathedral Street, Glasgow G1 1XL, Scotland, U.K
| | - Angeles Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC , Carretera de La Esperanza 3, 38206, La Laguna, Tenerife, Spain
| | - Inés Pérez-Martín
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC , Carretera de La Esperanza 3, 38206, La Laguna, Tenerife, Spain
| | - Ernesto Suárez
- Síntesis de Productos Naturales, Instituto de Productos Naturales y Agrobiología del CSIC , Carretera de La Esperanza 3, 38206, La Laguna, Tenerife, Spain
| |
Collapse
|
18
|
Romero-Estudillo I, Saavedra C, Boto A, Álvarez E. Site-selective modification of peptides: From “customizable units” to novelα-aryl andα-alkyl glycine derivatives, and components of branched peptides. Biopolymers 2015; 104:650-62. [DOI: 10.1002/bip.22642] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/04/2015] [Accepted: 03/07/2015] [Indexed: 12/15/2022]
Affiliation(s)
- Iván Romero-Estudillo
- Instituto de Productos Naturales y Agrobiología CSIC; Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna Tenerife Spain
| | - Carlos Saavedra
- Instituto de Productos Naturales y Agrobiología CSIC; Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna Tenerife Spain
| | - Alicia Boto
- Instituto de Productos Naturales y Agrobiología CSIC; Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna Tenerife Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas CSIC-USE; Avda. Américo Vespucio 49, Isla de la Cartuja, 41092 Sevilla Spain
| |
Collapse
|
19
|
Chiba S, Chen H. sp3 C–H oxidation by remote H-radical shift with oxygen- and nitrogen-radicals: a recent update. Org Biomol Chem 2014; 12:4051-60. [DOI: 10.1039/c4ob00469h] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
This review updates on recent advances in aliphatic sp3 C–H bond oxidation by remote H-radical abstraction with oxygen- and nitrogen-radicals classifying by the type of the radical precursors.
Collapse
Affiliation(s)
- Shunsuke Chiba
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371, Singapore
| | - Hui Chen
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371, Singapore
| |
Collapse
|
20
|
Guyenne S, León EI, Martín A, Pérez-Martín I, Suárez E. Intramolecular 1,8-Hydrogen Atom Transfer Reactions in Disaccharide Systems Containing Furanose Units. J Org Chem 2012; 77:7371-91. [DOI: 10.1021/jo301153u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Sabrina Guyenne
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Elisa I. León
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Angeles Martín
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Inés Pérez-Martín
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| | - Ernesto Suárez
- Instituto de Productos Naturales y Agrobiología del CSIC, Carretera de La Esperanza 3, 38206 La Laguna,
Tenerife, Spain
| |
Collapse
|
21
|
Mukherjee S, Tripathi PN, Mandal SB. Allyloxy and Propargyloxy Group Migration: Role of Remote Group Participation in the Synthesis of 5-C-Nucleosides and Other Sugar Derivatives. Org Lett 2012; 14:4186-9. [DOI: 10.1021/ol301851q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subhrangshu Mukherjee
- Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
| | - Prabhash N. Tripathi
- Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
| | - Sukhendu B. Mandal
- Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India
| |
Collapse
|
22
|
Saavedra CJ, Boto A, Hernández R. “Customizable” Units in Di- and Tripeptides: Selective Conversion into Substituted Dehydroamino Acids. Org Lett 2012; 14:3788-91. [DOI: 10.1021/ol301676z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Carlos J. Saavedra
- Instituto de Productos Naturales y Agrobiología CSIC, Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Alicia Boto
- Instituto de Productos Naturales y Agrobiología CSIC, Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Rosendo Hernández
- Instituto de Productos Naturales y Agrobiología CSIC, Avda. Astrofísico Fco. Sánchez 3, 38206 La Laguna, Tenerife, Spain
| |
Collapse
|
23
|
Doboszewski B, Herdewijn P. 1,2;3,4-Di-O-isopropylidene-l-galactose synthesis from its d-enantiomer. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.091] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
24
|
Dureau R, Legentil L, Daniellou R, Ferrières V. Two-step synthesis of per-O-acetylfuranoses: optimization and rationalization. J Org Chem 2012; 77:1301-7. [PMID: 22283704 DOI: 10.1021/jo201913f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A simple two-step procedure yielding peracetylated furanoses directly from free aldoses was implemented. Key steps of the method are (i) highly selective formation of per-O-(tert-butyldimethylsilyl)furanoses and (ii) their clean conversion into acetyl ones without isomerization. This approach was easily applied to galactose and structurally related carbohydrates such as arabinose, fucose, methyl galacturonate and N-acetylgalactosamine to give the corresponding peracetylated targets. The success of this procedure relied on the control of at least three parameters: (i) the tautomeric equilibrium of the starting unprotected oses, (ii) the steric hindrance of both targeted furanoses and silylating agent, and finally, (iii) the reactivity of each soft nucleophile during the protecting group interconversion.
Collapse
Affiliation(s)
- Rémy Dureau
- Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7, France
| | | | | | | |
Collapse
|
25
|
Adogla EA, Janser RFJ, Fairbanks SS, Vortolomei CM, Meka RK, Janser I. Selective methoxy ether cleavage of 2,6-dimethoxyphenol followed by a selective acylation. Tetrahedron Lett 2012; 53:11-14. [PMID: 22162619 DOI: 10.1016/j.tetlet.2011.10.140] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A Friedel-Crafts reaction of 2,6-dimethoxyphenol in the presence of aluminum chloride and propanoyl or butanoyl chlorid, respectively, lead, at elevated temperatures, to a selective cleavage of one of the methoxy groups followed by a selective acylation of the meta position with respect to the phenolic hydroxyl group. Under the same reaction conditions 2-methoxyphenol doesn't get demethylated; a mechanism to account for these findings is proposed. This reaction gives access to a variety of ortho-acylated catechols. Substituted catechols are widely used in supramolecular chemistry and are precursors of pesticides, flavors and fragrances. Additionally, catechol moieties are found in various natural products.
Collapse
Affiliation(s)
- Enoch A Adogla
- Laboratory of Organic Synthesis, Catalysis & Biochemistry (LOSCB), Department of Chemistry, New Mexico Institute of Mining and Technology, 801 Leroy Place, Socorro, NM 87801, USA
| | | | | | | | | | | |
Collapse
|
26
|
Jereb M, Vražič D, Zupan M. Iodine-catalyzed transformation of molecules containing oxygen functional groups. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.11.086] [Citation(s) in RCA: 134] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Guo HM, Xia C, Niu HY, Zhang XT, Kong SN, Wang DC, Qu GR. Intermolecular Hydrogen Abstraction Reaction between Nitrogen Radicals in Purine Rings and Alkyl Ethers: A Highly Selective Method for the Synthesis of N-9 Alkylated Purine Nucleoside Derivatives. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201000682] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
28
|
Fylaktakidou KC, Duarte CD, Koumbis AE, Nicolau C, Lehn JM. Polyphosphates and Pyrophosphates of Hexopyranoses as Allosteric Effectors of Human Hemoglobin: Synthesis, Molecular Recognition, and Effect on Oxygen Release. ChemMedChem 2010; 6:153-68. [DOI: 10.1002/cmdc.201000366] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
29
|
Boto A, Hernández D, Hernández R, Álvarez E. Coupling Radical and Ionic Processes: An Unusual Rearrangement Affords Sugar andC-Glycoside Derivatives. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
30
|
Francisco C, Herrera A, Kennedy A, Martín A, Melián D, Pérez-Martín I, Quintanal L, Suárez E. Intramolecular 1,8-Hydrogen-Atom Transfer Reactions in (1→4)-O-Disaccharide Systems: Conformational and Stereochemical Requirements. Chemistry 2008; 14:10369-81. [DOI: 10.1002/chem.200801414] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|