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Muru K, Cloutier M, Provost-Savard A, Di Cintio S, Burton O, Cordeil J, Groleau MC, Legault J, Déziel E, Gauthier C. Total Synthesis of a Chimeric Glycolipid Bearing the Partially Acetylated Backbone of Sponge-Derived Agminoside E. J Org Chem 2021; 86:15357-15375. [PMID: 34672576 DOI: 10.1021/acs.joc.1c01907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe the total synthesis of a chimeric glycolipid bearing both the partially acetylated backbone of sponge-derived agminoside E and the (R)-3-hydroxydecanoic acid chain of bacterial rhamnolipids. The branched pentaglucolipid skeleton was achieved using a [3 + 2] disconnection approach. The β-(1 → 2) and β-(1 → 4)-glycosidic bonds were synthesized through a combination of NIS/Yb(OTf)3- and TMSOTf-mediated stereoselective glycosylations of thiotolyl, N-phenyltrifluoroacetimidate, and trichloroacetimidate donors. Late-stage pentaacetylation, Staudinger reduction of a (2-azidomethyl)benzoyl group, followed by continuous-flow microfluidic hydrogenolysis completed the total synthesis of the structurally simplified glycolipid, whose partial acetylation pattern on the glycan part was identical to agminoside E. Our study lays the foundation for the total synthesis of sponge-derived agminosides and the understanding of their biological functions in sponges.
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Affiliation(s)
- Kevin Muru
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Maude Cloutier
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Arianne Provost-Savard
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Sabrina Di Cintio
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Océane Burton
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Justin Cordeil
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Marie-Christine Groleau
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Jean Legault
- Département des Sciences Fondamentales, Université du Québec à Chicoutimi (UQAC), 555, boulevard de l'Université, Chicoutimi, Québec G7H 2B1, Canada
| | - Eric Déziel
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
| | - Charles Gauthier
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique (INRS), 531, boulevard des Prairies, Laval, Québec H7V 1B7, Canada
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Sarkar A, Jana S, Nayek HP. A pentanuclear Er (III) coordination cluster as a catalyst for selective synthesis of 1,2‐disubstituted benzimidazoles. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Arijit Sarkar
- Department of Chemistry Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand 826004 India
| | - Sourav Jana
- Department of Chemistry Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand 826004 India
| | - Hari Pada Nayek
- Department of Chemistry Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand 826004 India
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Tung CW, Tso CH, Chen BY, Chu H, Hou CH, Chen HC, Chang MC, Shyue JJ, Lin PH, Chen HM. Heterocyclic-Additive-Activated Dinuclear Dysprosium Electrocatalysts for Heterogeneous Water Oxidation. Inorg Chem 2021; 60:6930-6938. [PMID: 33792308 DOI: 10.1021/acs.inorgchem.1c00209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Heterogeneous catalysis based on air-stable lanthanide complexes is relatively rare, especially for electrochemical water oxidation and reduction. Therefore, it is highly desired to investigate the synergy caused by cocatalysts on the lanthanide complex family for heterogeneous catalysis because of their structural diversity, air/moisture insensitivity, and easy preparation under an air atmosphere. Two mononuclear and three dinuclear dysprosium complexes containing a series of Schiff-base ligands have been demonstrated as robust electrocatalysts for triggering heterogeneous water oxidation in alkaline solution, in which the complex [Dy2(hmb)2(OAc)4]·MeCN(3) was revealed to have the best activity toward heterogeneous water oxidation among all five complexes in the present study. The molecular activation of dysprosium complexes has also been investigated with a series of N-containing heterocyclic additives [i.e., 4-(dimethylamino)pyridine (DMAP), bis(triphenylphosphine)iminium chloride ([PPN]Cl), indole, and quinoline]. In particular, the corresponding overpotential was effectively enhanced by 211 mV (at a current density of 10 mA cm-2) with the assistance of DMAP. On the basis of electrochemical and ex situ/in situ spectroscopic investigations, the best catalyst, DMAP-complex 3 on a carbon paper electrode, was confirmed with well-maintained molecular identity during heterogeneous water oxidation free of forming any dysprosium oxide and/or undesired products.
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Affiliation(s)
- Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Cheng-Han Tso
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Bo-Yi Chen
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan
| | - Hang Chu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Cheng-Hung Hou
- Research Center for Applied Sciences, Academia Sinica, Taipei 106, Taiwan
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Chang Gung University, Taoyuan 333, Taiwan
| | - Mu-Chieh Chang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Jing-Jong Shyue
- Research Center for Applied Sciences, Academia Sinica, Taipei 106, Taiwan
| | - Po-Heng Lin
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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