1
|
Li T, Wang J, Zhu X, Zhou X, Sun S, Wang P, Cao H, Yu G, Li M. Synthesis of Rare 6-Deoxy-d-/l-Heptopyranosyl Fluorides: Assembly of a Hexasaccharide Corresponding to Campylobacter jejuni Strain CG8486 Capsular Polysaccharide. J Am Chem Soc 2021; 143:11171-11179. [PMID: 34260212 DOI: 10.1021/jacs.1c05048] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Campylobacter jejuni is the leading cause of human diarrheal diseases and has been designated as one of highly resistant pathogens by the World Health Organization. The C. jejuni capsular polysaccharides feature broad existence of uncommon 6dHepp residues and have proven to be potential antigens to develop innovative antibacterial glycoconjugation vaccines. To address the lack of synthetic methods for rare 6dHepp architectures of importance, we herein describe a novel and efficient approach for the preparation of uncommon d-/l-6dHepp fluorides that have power as glycosylating agents. The synthesis is achieved by a C1-to-C5 switch strategy relying on radical decarboxylative fluorination of uronic acids arising from readily available allyl d-C-glycosides. To further showcase the application of this protocol, a structurally unique hexasaccharide composed of →3)-β-d-6didoHepp-(1→4)-β-d-GlcpNAc-(1→ units, corresponding to the capsular polysaccharide of C. jejuni strain CG8486 has been assembled for the first time. The assembly is characterized by highly efficient construction of the synthetically challenging β-(1,2-cis)-d-ido-heptopyranoside by inversion of the C2 configuration of β-(1,2-trans)-d-gulo-heptopyranoside, which is conveniently obtained by anchimerically assisted stereoselective glycosylation of the orthogonally protected 6dgulHepp fluoride. Ready accessibility of 6dHepp fluorides and the resulting glycans could serve as a rational starting point for the further development of synthetic vaccines fighting Campylobacter infection.
Collapse
Affiliation(s)
- Tiantian Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Jianjun Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Xinhao Zhu
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Xin Zhou
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Shaozi Sun
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Peng Wang
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Hongzhi Cao
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Guangli Yu
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Ming Li
- Key Laboratory of Marine Medicine, Chinese Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
| |
Collapse
|
2
|
Ye W, Stevens CM, Wen P, Simmons CJ, Tang W. Mild Cu(OTf) 2-Mediated C-Glycosylation with Chelation-Assisted Picolinate as a Leaving Group. J Org Chem 2020; 85:16218-16225. [PMID: 32691596 PMCID: PMC8138965 DOI: 10.1021/acs.joc.0c01041] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
C-Glycosylation reactions of glycosyl picolinates with allyltrimethylsilane or silyl enol ethers were developed. Picolinate as a chelation-assisted leaving group could be activated by Cu(OTf)2 and avoided the use of harsh Lewis acids. The glycosylations were operated under mild neutral conditions and gave the corresponding C-glycosides in up to 95% yield with moderate to excellent stereoselectivities.
Collapse
Affiliation(s)
- Wenjing Ye
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
| | - Christopher M Stevens
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
| | - Peng Wen
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
| | - Christopher J Simmons
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Weiping Tang
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States
- Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| |
Collapse
|
3
|
Krištofíková D, Modrocká V, Mečiarová M, Šebesta R. Green Asymmetric Organocatalysis. CHEMSUSCHEM 2020; 13:2828-2858. [PMID: 32141177 DOI: 10.1002/cssc.202000137] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Asymmetric organocatalysis is becoming one of the main tools for the synthesis of chiral compounds that are needed as medicines, crop protection agents, and other bioactive molecules. It can be effectively combined with various green chemistry methodologies. Intensification techniques, such as ball milling, flow, high pressure, or light, bring not only higher yields, faster reactions, and easier product isolation, but also new reactivities. More sustainable reaction media, such as ionic liquids, deep eutectic solvents, green solvent alternatives, and water, also considerably enhance the sustainability profile of many organocatalytic reactions.
Collapse
Affiliation(s)
- Dominika Krištofíková
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Viktória Modrocká
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Mária Mečiarová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| |
Collapse
|
4
|
Abstract
From a selection of research topics carried out in our laboratory during the last twenty years it becomes apparent that our main target was the discovery of new or improved synthetic methods together with new properties. Our efforts were made with the aim of being of some utility to other fields of research, with particular emphasis to glycobiology and heterocyle-based bioorganic chemistry. We performed new chemistry mainly in the field of carbohydrate manipulations taking as a primary rule the simplicity and efficiency manners. Toward this end, modern synthetic tools and approaches were employed such as heterocyle-based transformations, multicomponent reactions, organocatalysis, click azide–alkyne cycloadditions, reactions in ionic liquids, click photoinduced thiol-ene coupling, and click sulfur–fluoride exchange chemistry. With these potent methodologies in hand, the syntheses of carbohydrate containing amino acids up to proteins glycosylation were performed.1 Heterocyclic Glycoconjugates and Amino Acids2 Triazole-Linked Oligonucleotides: Application of Click CuAAC3 Non-Natural Glycosyl Amino Acids4 Non-Natural Oligosaccharides5 Calixarene-Based Glycoclusters6 Carbohydrate-Based Building Blocks7 Homoazasugars and Aza-C-disaccharides8 Synthesis of Glycodendrimers9 Peptide and Protein Glycoconjugates10 Conclusions
Collapse
|
5
|
Stier K, Checinski MP, Witte SNR, Mahrwald R. Matched/Mismatched Cases in Proline-Catalyzed Cascade Reactions with Carbohydrates: A Computational Insight into the Role of d- and l-Proline. J Org Chem 2019; 84:1201-1217. [PMID: 30543442 DOI: 10.1021/acs.joc.8b02530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The cascade reactions of carbohydrates with methyl ketones in the presence of proline feature complex running reaction steps. By extensive quantum mechanical simulation, a coherent reaction mechanism was identified matching the experimental data. The present calculations indicate a Mannich reaction/proline hydrolysis/retro aza-Michael cascade to form an intermediate α,β-unsaturated ethyl ketone. This key precursor yields C-glycosides by a final intramolecular amine-catalyzed oxa-Michael addition. Additionally, the formation of this intermediate determines the rate and selectivity of the overall cascade reaction. Strongly matched and mismatched cases were observed when used with d- or l-proline. They are consistent with the calculated energy barriers of the corresponding transition states.
Collapse
Affiliation(s)
- Kenta Stier
- CreativeQuantum GmbH , Am Studio 2 , 12489 Berlin , Germany
| | | | - Swjatoslaw N R Witte
- Institute of Organic Chemistry , Leibnitz University, Hannover , Schneiderberg 1 B 30167 Hannover , Germany
| | - Rainer Mahrwald
- Institute of Chemistry , Humboldt University Berlin , Brook-Taylor Str. 2 , 12484 Berlin , Germany
| |
Collapse
|
6
|
Design and Synthesis of 99mTcN-Labeled Dextran-Mannose Derivatives for Sentinel Lymph Node Detection. Pharmaceuticals (Basel) 2018; 11:ph11030070. [PMID: 30012952 PMCID: PMC6160989 DOI: 10.3390/ph11030070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 12/02/2022] Open
Abstract
Background: New approaches based on the receptor-targeted molecular interaction have been recently developed with the aim to investigate specific probes for sentinel lymph nodes. In particular, the mannose receptors expressed by lymph node macrophages became an attractive target and different multifunctional mannose derivate ligands for the labeling with 99mTc have been developed. In this study, we report the synthesis of a specific class of dextran-based, macromolecular, multifunctional ligands specially designed for labeling with the highly stable [99mTc≡N]2+ core. Methods: The ligands have been obtained by appending to a macromolecular dextran scaffold pendant arms bearing a chelating moiety for the metallic group and a mannosyl residue for allowing the interaction of the resulting macromolecular 99mTc conjugate with specific receptors on the external membrane of macrophages. Two different chelating systems have been selected, S-methyl dithiocarbazate [H2N‒NH‒C(=S)SCH3=HDTCZ] and a sequence of two cysteine residues, that in combination with a monophosphine coligand, are able to bind the [99mTc≡N]2+ core. Conclusions: High-specific-activity labeling has been obtained by simple mixing and heating of the [99mTc≡N]2+ group with the new mannose-dextran derivatives.
Collapse
|
7
|
Kim DS, Fang FG, Choi HW, Fang H. Synthesis of the Halichondrin C1–C15 Fragment from a Halaven C27–C35 Byproduct: Stereospecific Intramolecular Kishi Reduction. Org Lett 2018; 20:4295-4297. [DOI: 10.1021/acs.orglett.8b01715] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dae-Shik Kim
- Integrated Chemistry Engine, Eisai AiM Institute, 4 Corporate Drive, Andover, Massachusetts 01810, United States
| | - Francis G. Fang
- Integrated Chemistry Engine, Eisai AiM Institute, 4 Corporate Drive, Andover, Massachusetts 01810, United States
| | - Hyeong-wook Choi
- Integrated Chemistry Engine, Eisai AiM Institute, 4 Corporate Drive, Andover, Massachusetts 01810, United States
| | - Hui Fang
- Integrated Chemistry Engine, Eisai AiM Institute, 4 Corporate Drive, Andover, Massachusetts 01810, United States
| |
Collapse
|
8
|
Heggelund JE, Mackenzie A, Martinsen T, Heim JB, Cheshev P, Bernardi A, Krengel U. Towards new cholera prophylactics and treatment: Crystal structures of bacterial enterotoxins in complex with GM1 mimics. Sci Rep 2017; 7:2326. [PMID: 28539625 PMCID: PMC5443773 DOI: 10.1038/s41598-017-02179-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 04/07/2017] [Indexed: 01/08/2023] Open
Abstract
Cholera is a life-threatening disease in many countries, and new drugs are clearly needed. C-glycosidic antagonists may serve such a purpose. Here we report atomic-resolution crystal structures of three such compounds in complexes with the cholera toxin. The structures give unprecedented atomic details of the molecular interactions and show how the inhibitors efficiently block the GM1 binding site. These molecules are well suited for development into low-cost prophylactic drugs, due to their relatively easy synthesis and their resistance to glycolytic enzymes. One of the compounds links two toxin B-pentamers in the crystal structure, which may yield improved inhibition through the formation of toxin aggregates. These structures can spark the improved design of GM1 mimics, either alone or as multivalent inhibitors connecting multiple GM1-binding sites. Future developments may further include compounds that link the primary and secondary binding sites. Serving as decoys, receptor mimics may lessen symptoms while avoiding the use of antibiotics.
Collapse
Affiliation(s)
- Julie Elisabeth Heggelund
- Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway. .,School of Biomedical Sciences, University of Leeds, LS2 9JT Leeds, UK and School of Pharmacy, University of Oslo, P.O. Box 1068, NO-0316, Blindern, Norway.
| | - Alasdair Mackenzie
- Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway.,Alere Technologies AS, Kjelsåsveien 161, NO-0884, Oslo, Norway
| | - Tobias Martinsen
- Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway
| | - Joel Benjamin Heim
- Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway
| | - Pavel Cheshev
- Universita' degli Studi di Milano, Dipartimento di Chimica, via Golgi 19, 20133, Milano, Italy.,Skolkovo innovation center, Office 229, OC Technopark bld. 2, Lugovaya str. 4, 143026, Moscow, Russia
| | - Anna Bernardi
- Universita' degli Studi di Milano, Dipartimento di Chimica, via Golgi 19, 20133, Milano, Italy
| | - Ute Krengel
- Department of Chemistry, University of Oslo, P.O. Box 1033, NO-0315, Blindern, Norway.
| |
Collapse
|
9
|
Richter C, Krumrey M, Klaue K, Mahrwald R. Cascade Reactions of Unprotected Ketoses with Ketones - A Stereoselective Access to C-Glycosides. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Celin Richter
- Humboldt University; Department of Chemistry; Brook-Taylor Str. 2 12489 Berlin Germany
| | - Michael Krumrey
- Humboldt University; Department of Chemistry; Brook-Taylor Str. 2 12489 Berlin Germany
| | - Kristin Klaue
- Humboldt University; Department of Chemistry; Brook-Taylor Str. 2 12489 Berlin Germany
| | - Rainer Mahrwald
- Humboldt University; Department of Chemistry; Brook-Taylor Str. 2 12489 Berlin Germany
| |
Collapse
|
10
|
Altiti AS, Bachan S, Alrowhani W, Mootoo DR. An organocatalytic strategy for the stereoselective synthesis of C-galactosides with fluorine at the pseudoanomeric carbon. Org Biomol Chem 2015; 13:10328-35. [PMID: 26312438 DOI: 10.1039/c5ob01471a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The α-fluorination of α- and β-C-ethanals of galactose using Jørgensen catalysts and NFSI was investigated. The crude reaction products were transformed to their primary alcohol or methylenated derivatives, which are versatile precursors to biologically interesting fluorinated glycomimetics. The α-C-glycoside substrate gave moderate to high yields of fluorinated α-C-glycosides with minor amounts of β-C-glycoside analogues. The reactions on the β-C-glycoside were lower yielding but gave exclusively fluorinated β-C-glycosides. For both α- and β-C-glycoside substrates (R) and (S) catalyst showed complementary stereoselectivity. The preparation of difluorinated materials required the use of racemic catalyst as enantiomerically pure catalyst gave intractable mixtures of products. These results are in line with the results for simple achiral aldehydes, and suggest that stereochemistry in the reactions of these chiral, highly substituted, carbohydrate-derived aldehydes are controlled primarily by the chirality in the catalyst.
Collapse
Affiliation(s)
- Ahmad S Altiti
- Department of Chemistry, Hunter College, 695 Park Avenue, New York, NY 10065, USA.
| | | | | | | |
Collapse
|
11
|
Zayas J, Annoual M, Das JK, Felty Q, Gonzalez WG, Miksovska J, Sharifai N, Chiba A, Wnuk SF. Strain Promoted Click Chemistry of 2- or 8-Azidopurine and 5-Azidopyrimidine Nucleosides and 8-Azidoadenosine Triphosphate with Cyclooctynes. Application to Living Cell Fluorescent Imaging. Bioconjug Chem 2015; 26:1519-32. [PMID: 26086070 DOI: 10.1021/acs.bioconjchem.5b00300] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Strain-promoted click chemistry of nucleosides and nucleotides with an azido group directly attached to the purine and pyrimidine rings with various cyclooctynes in aqueous solution at ambient temperature resulted in efficient formation (3 min to 3 h) of fluorescent, light-up, triazole products. The 2- and 8-azidoadenine nucleosides reacted with fused cyclopropyl cyclooctyne, dibenzylcyclooctyne, or monofluorocyclooctyne to produce click products functionalized with hydroxyl, amino, N-hydroxysuccinimide, or biotin moieties. The 5-azidouridine and 5-azido-2'-deoxyuridine were similarly converted to the analogous triazole products in quantitative yields in less than 5 min. The 8-azido-ATP quantitatively afforded the triazole product with fused cyclopropyl cyclooctyne in aqueous acetonitrile (3 h). The novel triazole adducts at the 2- or 8-position of adenine or 5-position of uracil rings induce fluorescence properties which were used for direct imaging in MCF-7 cancer cells without the need for traditional fluorogenic reporters. FLIM of the triazole click adducts demonstrated their potential utility for dynamic measuring and tracking of signaling events inside single living cancer cells.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Nima Sharifai
- §Department of Biology, University of Miami, Coral Gables, Florida 33146, United States
| | - Akira Chiba
- §Department of Biology, University of Miami, Coral Gables, Florida 33146, United States
| | | |
Collapse
|
12
|
Dai Q, Rana NK, Zhao JCG. Highly Stereoselective Synthesis of 2,6-cis-Substituted Tetrahydropyrans Using a One-Pot Sequential Catalysis. Org Lett 2013; 15:2922-5. [DOI: 10.1021/ol400900h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Qipu Dai
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Nirmal K. Rana
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - John Cong-Gui Zhao
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| |
Collapse
|
13
|
Liu L, Abdel Motaal B, Schmidt-Supprian M, Pohl NLB. Multigram synthesis of isobutyl-β-C-galactoside as a substitute of isopropylthiogalactoside for exogenous gene induction in mammalian cells. J Org Chem 2012; 77:1539-46. [PMID: 22283618 DOI: 10.1021/jo2024569] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Herein we report that isobutyl-β-C-galactoside (IBCG) is also a promising inducer of gene expression in mammalian cells and report a new synthetic route to the compound that should make obtaining the multigram quantities of material required for animal studies more feasible. A convenient synthesis of IBCG, an inducer of genes controlled by the lac operon system in bacterial cells, was achieved in 5 steps from galactose in 81% overall yield without any chromatographic separation steps. An optimized microwave-assisted reaction at high concentration was key to making the C-glycosidic linkage. A Wittig reaction on a per-O-silylated rather than per-O-acetylated or -benzylated substrate proved most effective in installing the final carbon atom.
Collapse
Affiliation(s)
- Lin Liu
- Department of Chemistry, Plant Sciences Institute, Hach Hall, Iowa State University, Ames, Iowa 50011-3111, USA
| | | | | | | |
Collapse
|
14
|
Fuwa H. Total Synthesis of Tetrahydropyran-Containing Natural Products Exploiting Intramolecular Oxa-Conjugate Cyclization. HETEROCYCLES 2012. [DOI: 10.3987/rev-12-730] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
15
|
|
16
|
Fuwa H, Ichinokawa N, Noto K, Sasaki M. Stereoselective Synthesis of 2,6-Cis-Substituted Tetrahydropyrans: Brønsted Acid-Catalyzed Intramolecular Oxa-Conjugate Cyclization of α,β-Unsaturated Ester Surrogates. J Org Chem 2011; 77:2588-607. [DOI: 10.1021/jo202179s] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Haruhiko Fuwa
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Naoki Ichinokawa
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Kenkichi Noto
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| | - Makoto Sasaki
- Graduate
School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577,
Japan
| |
Collapse
|
17
|
Belkheira M, El Abed D, Pons JM, Bressy C. Organocatalytic synthesis of 1,2,3-triazoles from unactivated ketones and arylazides. Chemistry 2011; 17:12917-21. [PMID: 21984230 DOI: 10.1002/chem.201102046] [Citation(s) in RCA: 171] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Mokhtaria Belkheira
- Institut des Sciences Moléculaires de Marseille (iSm2), CNRS UMR6263, Aix-Marseille Université, Campus Saint Jérôme, 13397 Marseille Cedex 20-Service 532, France
| | | | | | | |
Collapse
|
18
|
Opalka SM, Steinbacher JL, Lambiris BA, McQuade DT. Thiourea/Proline Derivative-Catalyzed Synthesis of Tetrahydrofuran Derivatives: A Mechanistic View. J Org Chem 2011; 76:6503-17. [DOI: 10.1021/jo200838v] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suzanne M. Opalka
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Jeremy L. Steinbacher
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Brandon A. Lambiris
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - D. Tyler McQuade
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| |
Collapse
|
19
|
Lövyova Z, Parkan K, Kniežo L. Stereoselective preparation of four 3-C-mannosylated d- and l-glucals from a single starting compound. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
20
|
Nagasawa T, Nukada T, Kuwahara S. Synthesis of aspergillide A via proline-catalyzed trans-to-cis isomerization of a substituted tetrahydropyran. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.02.061] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
21
|
Cheshev P, Morelli L, Marchesi M, Podlipnik C, Bergström M, Bernardi A. Synthesis and affinity evaluation of a small library of bidentate cholera toxin ligands: towards nonhydrolyzable ganglioside mimics. Chemistry 2010; 16:1951-67. [PMID: 20039344 DOI: 10.1002/chem.200902469] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A small library of nonhydrolyzable mimics of GM1 ganglioside, featuring galactose and sialic acid as pharmacophoric carbohydrate residues, was synthesized and tested. All compounds were synthesized from readily available precursors using high-performance reactions, including click chemistry protocols, and avoiding O-glycosidic bonds. Some of the most active molecules also feature a point of further derivatization that can be used for conjugation with polyvalent aglycons. Their affinity towards cholera toxin was assessed by weak affinity chromatography, which allowed a systematic evaluation and selection of the best candidates. Affinity could be enhanced up to one or two orders of magnitude over the affinity of the individual pharmacophoric sugar residues.
Collapse
Affiliation(s)
- Pavel Cheshev
- Dipartimento di Chimica Organica e Industriale, Università degli Studi di Milano via Venezian 21, 20133 Milano, Italy
| | | | | | | | | | | |
Collapse
|
22
|
|
23
|
Nagasawa T, Kuwahara S. Synthesis of aspergillide A from a synthetic intermediate of aspergillide B. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.12.032] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
Parkan K, Werner L, Lövyová Z, Prchalová E, Kniežo L. An approach to stereoselective preparation of 3-C-glycosylated d- and l-glucals. Carbohydr Res 2010; 345:352-62. [DOI: 10.1016/j.carres.2009.11.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 11/18/2009] [Indexed: 10/20/2022]
|
25
|
Liu Z, Gong Y, Byun HS, Bittman R. An improved two-step synthetic route to primary allylic alcohols from aldehydes. NEW J CHEM 2010. [DOI: 10.1039/b9nj00710e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Giguère D, Cloutier P, Roy R. Domino Heck/Lactonization-Catalyzed Synthesis of 3-C-Linked Mannopyranosyl Coumarins. J Org Chem 2009; 74:8480-3. [DOI: 10.1021/jo901855p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Denis Giguère
- Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-Ville Montréal, QC, Canada H3C 3P8
| | - Philipe Cloutier
- Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-Ville Montréal, QC, Canada H3C 3P8
| | - René Roy
- Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-Ville Montréal, QC, Canada H3C 3P8
| |
Collapse
|
27
|
Kappe CO, Dallinger D. Controlled microwave heating in modern organic synthesis: highlights from the 2004–2008 literature. Mol Divers 2009; 13:71-193. [PMID: 19381851 DOI: 10.1007/s11030-009-9138-8] [Citation(s) in RCA: 292] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Accepted: 02/27/2009] [Indexed: 01/25/2023]
|
28
|
|
29
|
Nuzzi A, Massi A, Dondoni A. General Synthesis of C-Glycosyl Amino Acids via Proline-Catalyzed Direct Electrophilic α-Amination of C-Glycosylalkyl Aldehydes. Org Lett 2008; 10:4485-8. [DOI: 10.1021/ol801685x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrea Nuzzi
- Dipartimento di Chimica, Laboratorio di Chimica Organica, Università di Ferrara, Via L. Borsari 46, I-44100 Ferrara, Italy
| | - Alessandro Massi
- Dipartimento di Chimica, Laboratorio di Chimica Organica, Università di Ferrara, Via L. Borsari 46, I-44100 Ferrara, Italy
| | - Alessandro Dondoni
- Dipartimento di Chimica, Laboratorio di Chimica Organica, Università di Ferrara, Via L. Borsari 46, I-44100 Ferrara, Italy
| |
Collapse
|
30
|
Abstract
After an initial period of validating asymmetric organocatalysis by using a wide range of important model reactions that constitute the essential tools of organic synthesis, the time has now been reached when organocatalysis can be used to address specific issues and solve pending problems of stereochemical relevance. This Review deals with selected studies reported in 2006 and the first half of 2007, and is intended to highlight four main aspects that may be taken as testimony of the present status and prospective of organocatalysis: a) chemical efficiency; b) discovery of new substrate combinations to give new asymmetric syntheses; c) development of new catalysts for specific purposes by using mechanistic findings; and d) applications of organocatalytic reactions in the asymmetric total synthesis of target natural products and known compounds of biological and pharmaceutical relevance.
Collapse
Affiliation(s)
- Alessandro Dondoni
- Dipartimento di Chimica, Università di Ferrara, Via L. Borsari 46-44100 Ferrara, Italy.
| | | |
Collapse
|
31
|
Razzaq T, Kremsner JM, Kappe CO. Investigating the Existence of Nonthermal/Specific Microwave Effects Using Silicon Carbide Heating Elements as Power Modulators. J Org Chem 2008; 73:6321-9. [DOI: 10.1021/jo8009402] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tahseen Razzaq
- Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - Jennifer M. Kremsner
- Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| | - C. Oliver Kappe
- Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria
| |
Collapse
|
32
|
|