Výsledky vyhledávání - "Jacques Gelas"

Asymmetric synthesis of C-6 substituted pipecolic acid derivatives

Autor: Catherine Fayet, Jacques Gelas, Sylvie Carbonnel, Yves Troin

Publikováno v: Tetrahedron Letters. 41:8293-8296

The synthesis of C-6 substituted pipecolic acid derivatives using an intramolecular Mannich-type reaction is described.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::388f831a40f155c57960fbb92021592e
https://doi.org/10.1016/s0040-4039(00)01463-5

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Stereoselective Synthesis of Substituted Piperidines – Total Synthesis and Absolute Configurations of (+)- and (–)-Dienomycin C

Autor: Isabelle Ripoche, Jacques Gelas, Yves Troin, Jean-Louis Canet

Publikováno v: European Journal of Organic Chemistry. 1999:1517-1521

The first total asymmetric synthesis and the attribution of the absolute configurations of (+)-dienomycin C (1), an alkaloid isolated from a Streptomyces strain, are reported. This compound was prepared in six steps from the enantiopure tricarbonyl(d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cd1461d86417a9c2ca749868e9cee872
https://doi.org/10.1002/(sici)1099-0690(199907)1999:7<1517::aid-ejoc1517>3.0.co

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A practical asymmetric synthesis of 2,6-cis-disubstituted piperidines

Autor: Pascale Besse, Jacques Gelas, Henri Veschambre, Yves Troin, Jean-Louis Canet, Stephane Ciblat

Publikováno v: Tetrahedron: Asymmetry. 10:2225-2235

A highly diastereoselective intramolecular Mannich reaction involving enantiopure α-methylamine 7 and achiral aldehydes is employed to prepare enantiomerically pure 2,6- cis -disubstituted piperidines. This methodology provides an efficient and sele

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::411c0768398eb089530c74b2301835a8
https://doi.org/10.1016/s0957-4166(99)00226-8

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Synthesis of S-Linked Thiooligosaccharide Analogues of Nodulation Factors. 2.1 Synthesis of an Intermediate Thiotrisaccharide

Autor: Jacques Gelas, Jean-Claude Promé, France-Isabelle Auzanneau, Danielle Promé, Monia Mialon

Publikováno v: The Journal of Organic Chemistry. 63:6460-6465

An S-linked thiotrisaccharide analogue of chitin that carries different N-protecting groups at the reducing and nonreducing end glucosamine residues was prepared as an intermediate for the synthesis of thioanalogues of nodulation factors. 1,6-Anhydro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::145bb363f34a59216371cf5b5e532c11
https://doi.org/10.1021/jo980735a

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Synthesis of S-linked thiooligosaccharide analogues of Nod factors. Part 1: selectively N-protected 4-thiochitobiose precursors

Autor: Jacques Defaye, France-Isabelle Auzanneau, Jacques Gelas, Danielle Promé, Khalil Bennis, Elisabeth Fanton

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :3629-3636

The synthesis of S-linked thio-analogues of chitobiose diversely substituted at both 2-acetamido-2-deoxy-D-glucopyranosyl units has been achieved successfully starting either from a 1,6-anhydro-4-O-triflyl galactosaminide derivative in reaction with

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a455a48529c3ed56c9898e5cda2d19b
https://doi.org/10.1039/a802932f

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Asymmetric synthesis of alkaloid (−)-(2S,4S ) SS 20846 A and its C-4 epimer

Autor: Jacques Gelas, Yves Troin, Isabelle Ripoche, Bettina Aboab, Jean-Louis Canet

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :3485-3492

A diastereoselective intramolecular Mannich reaction using planar chiral iron dienal complexes is employed to prepare optically pure 2,4-disubstituted piperidines. This methodology is applied to the synthesis of natural alkaloids (–)-6 and (–)-7.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::81bb97440a0e38cba2cec6bd93d597b6
https://doi.org/10.1039/a804288h

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Further examples of orthoesterification under kinetically controlled conditions application to the selective acylation of sucrose, maltose and α,α-trehalose

Autor: Jacques Gelas, Mohamed Bouchra

Publikováno v: Carbohydrate Research. 305:17-25

Orthoesterification of sucrose with 1,1-dimethoxyethene under kinetic control gave 4,6-O-methoxyethylidenesucrose in 77% crude yield. Similar orthoesterification of maltose led essentially after acetylation to 1,2,3,6,2',3'-hexa-O-acetyl-4'-6'-O-meth

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d141c96f4b2df13f813e780eb000749f
https://doi.org/10.1016/s0008-6215(97)00208-5

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The introduction of an hydrophobic chain on α, α-trehalose via the synthesis of acetals. The detergent properties of these derivatives

Autor: Jacques Besson, Jacques Gelas, Catherine Fayet

Publikováno v: Carbohydrate Research. 303:159-164

Classical transacetalation of trehalose with 2,2-dimethoxyalkanes leads conveniently to a new class of acetals of a great potential due to their detergent properties. The control of the mono- or di-functionalization was possible.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fdd5d39d72e93e6fcc7fee2dc02b59c1
https://doi.org/10.1016/s0008-6215(97)00154-7

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Synthesis of new enantiomerically pure polyhydroxylated azetidines from monosaccharides

Autor: Sithan Chou, Josette Chanet-Ray, Jacques Gelas, Thierry Michaud

Publikováno v: Carbohydrate Research. 303:123-127

Catalytic hydrogenation of O-protected galactopyranoside-fused azetidines led to enantiomerically pure polyhydroxylated azetidines possessing four chiral centers.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ed3355614de5821239211ab4f667b84f
https://doi.org/10.1016/s0008-6215(97)00141-9

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