Výsledky vyhledávání - "Michel Franck-Neumann"

Inter- and intramolecular carbene reactions of diazoketones tethered to tricarbonyliron coordinated acyclic dienes. New tricarbonyliron complexes of cyclohexa-2,4-dienone and cyclopent-2-enone

Autor: Dominique Gassmann, Alain Winling, Philippe Geoffroy, Michel Franck-Neumann

Publikováno v: Tetrahedron Letters. 45:5407-5410

A series of diazoketones tethered to tricarbonyliron coordinated dienes at the terminal position have been synthesized, and their decomposition reactions as carbene precursors studied. Intermolecular reactions with nucleophilic olefins were observed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8944a84aac6bb70c5fa8792803d18934
https://doi.org/10.1016/j.tetlet.2004.05.052

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Synthesis of tricarbonyliron cyclohexa-2,4-dienone complexes from tosylhydrazones of acyclic dienone complexes. A novel ansa dicarbonyliron complex by intramolecular trapping of reaction intermediates of the cyclocarbonylation reaction

Autor: Michel Franck-Neumann, Philippe Geoffroy, Christophe Cénac, Dominique Gassmann

Publikováno v: Journal of Organometallic Chemistry. 678:68-71

Cyclohexa-2,4-dienones stabilized by coordination to tricarbonyliron are obtained when tosylhydrazones of tricarbonyliron complexed dienones are submitted to the conditions of the Bamford-Stevens reaction (thermolysis in the presence of strong bases)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cef4d936a8fe5069f0e359f550ca8492
https://doi.org/10.1016/s0022-328x(03)00437-6

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Conjugate addition of organozinc reagents to enones linked to a tricarbonyl iron diene unit. Asymmetric synthesis of a building block of amphotericin B

Autor: Christelle Gateau, Franck Morin, Laurence Miesch, Michel Franck-Neumann

Publikováno v: Tetrahedron Letters. 43:7635-7638

Conjugate addition of organometallics to enones linked by the ketocarbonyl to tricarbonyliron diene units can be successfully achieved with dialkylzinc reagents, when used in the presence of trimethylsilyl triflate. Organocopper reagents are not well

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa6eb7397a61afa1bc3d7ed90739e7db
https://doi.org/10.1016/s0040-4039(02)01585-x

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Highly stereoselective biomimetic polyene cyclizations using chiral pentadienol tricarbonyliron complexes

Autor: Michel Franck-Neumann, David Hanss, Philippe Geoffroy

Publikováno v: Tetrahedron Letters. 43:2277-2280

Acyclic E-5,9-polyenes linked to chiral 1-pentadienol tricarbonyliron fragments are highly stereoselectively cyclized via cationic intermediates with retention of configuration in chair-like transition states (several X-ray structures). This allows t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b84c196f67b269d9828d796f3d9e8f13
https://doi.org/10.1016/s0040-4039(02)00190-9

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Synthesis of Mono- and Polycyclic Tricarbonyliron Cyclohexa-2,4-dienone Complexes and Phenols from Tosylhydrazones of Acyclic Dienone Complexes

Autor: Dominique Gassmann, Philippe Geoffroy, Michel Franck-Neumann

Publikováno v: Synlett. :2054-2058

Cyclohexa-2,4-dienones stabilized by coordination to tricarbonyliron are obtained when the tosylhydrazones of tricarbonyliron-complexed α-dienones are thermolyzed in the presence of strong bases. This cyclocarbonylation reaction of carbenic intermed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2fdf4d6d2ee4024e4ccd6aaf75bf50c7
https://doi.org/10.1055/s-2002-35598

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A new method for the demetallation of tricarbonyliron diene complexes by total hydrogenation with Raney nickel. Application to a very short synthesis of (+)-[6]-gingerdiol

Autor: Paul Bissinger, Michel Franck-Neumann, Sylvie Adelaide, Philippe Geoffroy

Publikováno v: Tetrahedron Letters. 42:6401-6404

Demetallation of tricarbonyliron diene complexes is rapidly achieved by treatment with freshly prepared Raney nickel. The ligands which are totally hydrogenated during the decomplexation are easily isolated in high yields, without racemization, if ch

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5e24194c1730fd39b19827670cb80254
https://doi.org/10.1016/s0040-4039(01)01263-1

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Highly Stereoselective Total Synthesis of Multiply Protected 3-Amino-3,6-dideoxyaldohexoses (Mycosamine/Mycaminose) by Aldol Condensation Reaction, Mediated by Tin Triflate, of Tricarbonyliron/α-Aminodienone Complexes

Autor: Christelle Gateau, Michel Franck-Neumann, Laurence Miesch-Gross

Publikováno v: European Journal of Organic Chemistry. 2000:3693-3702

The divalent tin enol ether of the racemic complex between N-BOC-α-aminoheptadienone and tricarbonyliron reacts with both enantiomers of protected lactaldehydes to yield predominantly one optically active, easily isolable ketol diastereoisomer (45%)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::15601634e780f9a2648fb20b98219ed1
https://doi.org/10.1002/1099-0690(200011)2000:22<3693::aid-ejoc3693>3.0.co

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Aldol condensation reactions of tricarbonyliron complexes. Towards building blocks for the synthesis of carbomycin B/tylosin macrolide antibiotics and fluorinated analogs

Autor: Fabien Gumery, Michel Franck-Neumann, Philippe Geoffroy

Publikováno v: Tetrahedron Letters. 41:4219-4222

Tricarbonyliron complexes of α-methoxyheptadienone 3 and octadienone 8 were reacted as silyl enol ethers with protected β-hydroxypropanal and TiCl4, to give the syn–syn aldol condensation products 4 and 11 as major, isolated diastereomers (61 and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb7ac4833c4708d17cb0326b6ed7c0b8
https://doi.org/10.1016/s0040-4039(00)00569-4

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Cyclization and fluorination of 5-hexenols with boron trifluoride etherate.Stereoselective synthesis of (optically active) fluorinated cyclohexane derivatives by cyclization of ω-pentenyl pentadienol tricarbonyl iron complexes

Autor: Philippe Geoffroy, David Hanss, Michel Franck-Neumann

Publikováno v: Tetrahedron Letters. 40:8487-8490

Monofluorinated cyclohexane derivatives are obtained by treatment of ω-pentenyl pentadienol tricarbonyl iron complexes with boron trifluoride etherate. The reaction is stereoselective, so that optically active fluorocyclohexanes can be obtained from

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c2268b804298ce44f1db7566109fbdae
https://doi.org/10.1016/s0040-4039(99)01797-9

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Highly stereoselective synthesis of 3-amino-3,6-dideoxy-aldohexoses by tin triflate mediated aldol condensation reaction of tricarbonyl iron α-aminodienone complexes. Total synthesis of multiprotected mycosamine

Autor: Michel Franck-Neumann, Laurence Miesch-Gross, Christelle Gateau

Publikováno v: Tetrahedron Letters. 40:2829-2832

The divalent tin enol ether of the racemic N-BOC α-aminodienone tricarbonyliron complex 4 reacts with both enantiomers of protected lactaldehydes to predominantly yield one optically active ketol diastereoisomer (45 %). From the enantiomerically pur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa14920612b4917d2f1dfa09243ae48b
https://doi.org/10.1016/s0040-4039(99)00271-3

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