In Situ Generated DBU⋅HF Acts as a Fluorinating Agent in a Hexafluoroisobutylation Tandem Reaction: An Effective Route to 5,5,5,5’,5’,5’‐Hexafluoroleucine
| dc.rights.license | open | en_US |
| hal.structure.identifier | Chimie et Biologie des Membranes et des Nanoobjets [CBMN] | |
| dc.contributor.author | NAULET, Guillaume | |
| hal.structure.identifier | Chimie et Biologie des Membranes et des Nanoobjets [CBMN] | |
| dc.contributor.author | DELAMARE, Aline | |
| hal.structure.identifier | Chimie et Biologie des Membranes et des Nanoobjets [CBMN] | |
| dc.contributor.author | GUICHARD, Gilles
IDREF: 084339268 | |
| hal.structure.identifier | Chimie et Biologie des Membranes et des Nanoobjets [CBMN] | |
| dc.contributor.author | COMPAIN, Guillaume
IDREF: 168058782 | |
| dc.date.accessioned | 2024-08-27T08:20:11Z | |
| dc.date.available | 2024-08-27T08:20:11Z | |
| dc.date.issued | 2023-03-07 | |
| dc.identifier.issn | 1434-193X | en_US |
| dc.identifier.uri | orcid:0000-0002-9556-1016:10.1002/ejoc.202201148 | |
| dc.identifier.uri | oai:crossref.org:10.1002/ejoc.202201148 | |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/201310 | |
| dc.description.abstractEn | We report the direct incorporation of the hexafluoroisobutyl group on a chiral glycine Schiff base complex mediated by 1,8 diazabicyclo[5.4.0]undec-7-ene (DBU). The fluoroalkylation involves 2-(bromomethyl)-1,1,1,3,3,3-hexafluoropropane reagent, which generates in situ hexafluoroisobutylene (HFIB), and reacts then with the enolate through a tandem allylic shift/hydrofluorination process. We showed that the use of neutral organic base DBU generates in situ an original DBU⋅HF salt, which preserves the fluoride nucleophilicity and acts as a fluorinating agent. This fluoride salt promotes the hydrofluorination of the pentafluorinated alkene overcoming the usual fluoride β-elimination observed with α-CF3-vinyl reagents. With alkali metal bases, by contrast, the hydrofluorination is disfavored and the pentafluorinated alkene intermediate is obtained predominantly. This study highlights the critical role of the fluoride counter ion to preserve its nucleophilicity. The protocol is amenable to multidecagram scale synthesis of enantiopure (S)- and (R)-5,5,5,5’,5’,5’-hexafluoroleucine and their N-Fmoc or N-Boc derivatives in good overall yield. | |
| dc.description.sponsorship | Interactions supramoléculaires sélectives et directionnelles à base de synthons fluorés hautement polaires - ANR-20-CE06-0008 | en_US |
| dc.language.iso | EN | en_US |
| dc.rights | Attribution 3.0 United States | * |
| dc.rights.uri | http://creativecommons.org/licenses/by/3.0/us/ | * |
| dc.source | orcid | |
| dc.source | crossref | |
| dc.subject.en | Fluoroalkylation | |
| dc.subject.en | Fluorination | |
| dc.subject.en | Amino acids | |
| dc.subject.en | Stereoselective synthesis | |
| dc.subject.en | Synthetic methods | |
| dc.title.en | In Situ Generated DBU⋅HF Acts as a Fluorinating Agent in a Hexafluoroisobutylation Tandem Reaction: An Effective Route to 5,5,5,5’,5’,5’‐Hexafluoroleucine | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.1002/ejoc.202201148 | en_US |
| bordeaux.journal | European Journal of Organic Chemistry | en_US |
| bordeaux.volume | 26 | en_US |
| bordeaux.hal.laboratories | CBMN : Chimie & de Biologie des Membranes & des Nano-objets - UMR 5248 | en_US |
| bordeaux.issue | 10 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | Bordeaux INP | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | dissemin | |
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| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
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| workflow.import.source | dissemin | |
| dc.rights.cc | CC BY-NC | en_US |
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