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Kaszás T, Baráth BÁ, Balázs B, Blága T, Juhász L, Somsák L, Tóth M. Coupling Reactions of Anhydro-Aldose Tosylhydrazones with Boronic Acids. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27061795. [PMID: 35335162 PMCID: PMC8953641 DOI: 10.3390/molecules27061795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/03/2022] [Accepted: 03/06/2022] [Indexed: 11/17/2022]
Abstract
A catalyst-free coupling reaction between O-peracetylated, O-perbenzoylated, O-permethylated, and O-permethoxymethylated 2,6-anhydro-aldose tosylhydrazones (C-(β-d-glycopyranosyl)formaldehyde tosylhydrazones) and aromatic boronic acids is reported. The base-promoted reaction is operationally simple and exhibits a broad substrate scope. The main products in most of the transformations were open-chain 1-C-aryl-hept-1-enitol type compounds while the expected β-d-glycopyranosylmethyl arenes (benzyl C-glycosides) were formed in subordinate yields only. A mechanistic rationale is provided to explain how a complex substrate may change the well-established course of the reaction.
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Kaszás T, Cservenyák I, Juhász-Tóth É, Kulcsár AE, Granatino P, Nilsson UJ, Somsák L, Tóth M. Coupling of N-tosylhydrazones with tetrazoles: synthesis of 2-β-D-glycopyranosylmethyl-5-substituted-2 H-tetrazole type glycomimetics. Org Biomol Chem 2021; 19:605-618. [PMID: 33355586 DOI: 10.1039/d0ob02248a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Coupling reactions of O-peracylated 2,6-anhydro-aldose tosylhydrazones (C-(β-d-glycopyranosyl)formaldehyde tosylhydrazones) with tetrazoles were studied under metal-free conditions using thermic or microwave activation in the presence of different bases. The reactions proved highly regioselective and gave the corresponding, up-to-now unknown 2-β-d-glycopyranosylmethyl-2H-tetrazoles in 7-67% yields. The method can be applied to get new types of disaccharide mimetics, 5-glycosyl-2-glycopyranosylmethyl-2H-tetrazoles, as well. Galectin binding studies with C-(β-d-galactopyranosyl)formaldehyde tosylhydrazone and 2-(β-d-galactopyranosylmethyl)-5-phenyl-2H-tetrazole revealed no significant inhibition of any of these lectins.
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Affiliation(s)
- Tímea Kaszás
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Ivett Cservenyák
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Éva Juhász-Tóth
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Andrea E Kulcsár
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Paola Granatino
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Ulf J Nilsson
- Centre for Analysis and Synthesis, Lund University, Lund, Sweden
| | - László Somsák
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
| | - Marietta Tóth
- Department of Organic Chemistry, University of Debrecen, PO Box 400, H-4002 Debrecen, Hungary.
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Kotovshchikov YN, Latyshev GV, Kirillova EA, Moskalenko UD, Lukashev NV, Beletskaya IP. Assembly of Thiosubstituted Benzoxazoles via Copper-Catalyzed Coupling of Thiols with 5-Iodotriazoles Serving as Diazo Surrogates. J Org Chem 2020; 85:9015-9028. [PMID: 32508100 DOI: 10.1021/acs.joc.0c00931] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient cascade approach to thiosubstituted benzoxazoles has been developed. The transformation starts with in situ generation of a diazo compound via annulation-triggered electrocyclic opening of the 1,2,3-triazole ring. The subsequent Cu-catalyzed trapping of diazo intermediates by various thiols affords the desired heterocycles in generally good yields of up to 91%. The protocol features very good functional group tolerance and is applicable to substrates with different electronic properties.
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Affiliation(s)
- Yury N Kotovshchikov
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia
| | - Gennadij V Latyshev
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia
| | - Elena A Kirillova
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia
| | - Uliana D Moskalenko
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia.,Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Nikolay V Lukashev
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia
| | - Irina P Beletskaya
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskiye Gory 1, Moscow 119991, Russia
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Abstract
Abstract
Glycomimetics are compounds that resemble carbohydrate molecules in their chemical structure and/or biological effect. A large variety of compounds can be designed and synthesized to get glycomimetics, however, C-glycosyl derivatives represent one of the most frequently studied subgroup. In the present survey syntheses of a range of five- and six membered C-glycopyranosyl heterocycles, anhydro-aldimine type compounds, exo-glycals, C-glycosyl styrenes, carbon-sulfur bonded oligosaccharide mimics are described. Some of the C-glycopyranosyl azoles, namely 1,2,4-triazoles and imidazoles belong to the most efficient glucose analog inhibitors of glycogen phosphorylase known to date. Biological studies revealed the therapeutical potential of such inhibitors. Other synthetic derivatives offer versatile possibilities to get further glycomimetics.
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Kaszás T, Tóth M, Langer P, Somsák L. C
‐Glycosyl Styrene Type Compounds by Pd‐Catalyzed Cross‐Coupling Reactions of Anhydro‐Aldose Tosylhydrazones with Benzyl Bromides. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Tímea Kaszás
- Department of Organic ChemistryUniversity of Debrecen, POB 400 H-4002 Debrecen Hungary
- Department of ChemistryUniversity of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
| | - Marietta Tóth
- Department of Organic ChemistryUniversity of Debrecen, POB 400 H-4002 Debrecen Hungary
| | - Peter Langer
- Department of ChemistryUniversity of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
| | - László Somsák
- Department of Organic ChemistryUniversity of Debrecen, POB 400 H-4002 Debrecen Hungary
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Kaszás T, Ivanov A, Tóth M, Ehlers P, Langer P, Somsák L. Pd-catalyzed coupling reactions of anhydro-aldose tosylhydrazones with aryl bromides to produce substituted exo-glycals. Carbohydr Res 2018; 466:30-38. [PMID: 29499901 DOI: 10.1016/j.carres.2018.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 02/16/2018] [Accepted: 02/16/2018] [Indexed: 12/14/2022]
Abstract
Palladium-catalyzed cross-couplings of O-peracylated and O-permethylated 2,6-anhydro-aldose tosylhydrazones with aryl halides were studied under thermic conditions in the presence of LiOtBu and phosphine ligands. The reactions gave the corresponding aryl substituted exo-glycals as mixtures of diastereomers in 11-75% yields. The transformations represent a new access to these types of glycomimetic compounds. The double bond of some aryl substituted exo-glycals was saturated to give good yields of benzylic C-glycosyl derivatives.
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Affiliation(s)
- Tímea Kaszás
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary; Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Anton Ivanov
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Marietta Tóth
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary
| | - Peter Ehlers
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - Peter Langer
- Department of Chemistry, University of Rostock, Albert-Einstein-Str. 3a, 18059 Rostock, Germany
| | - László Somsák
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary.
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