Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Joanna Paradowska"'
Publikováno v:
The Journal of Organic Chemistry. 77:173-187
In this article the utility of water-compatible amino-acid-based catalysts was explored in the development of diastereo- and enantioselective direct aldol reactions of a broad range of substrates. Chiral C 2 -symmetrical proline- and valine- based am
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1bf5a7bb9f6f5b02280c6a95002e6217
https://doi.org/10.1021/jo201584w
https://doi.org/10.1021/jo201584w
Publikováno v:
Angewandte Chemie. 121:4352-4362
Wasser kann wild sein, wie im Olgemalde „ES“ von Zdzislaw Beksinski (1985; 90 cm×92 cm; Wiedergabe mit Genehmigung von Piotr Dmochowski). Doch es gilt auch als ein vielversprechendes Medium fur asymmetrische Reaktionen. Naturliche Aminosauren si
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3e472c387140baded356554adda395d
https://doi.org/10.1002/ange.200802038
https://doi.org/10.1002/ange.200802038
Publikováno v:
Advanced Synthesis & Catalysis. 349:1041-1046
A combination of zinc triflate and chiral C 2 -symmetrical prolinamide ligand leads to high enantioselectivities in direct aldol reactions essentially assisted by water. The presence of 5 mol % of the catalyst affords an asymmetric intermolecular ald
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::17c5609a9ace48c14ff5c5a2674b1d84
https://doi.org/10.1002/adsc.200600581
https://doi.org/10.1002/adsc.200600581
Publikováno v:
The Journal of Organic Chemistry. 72:2228-2231
An iron(II) complex with a hindered hydroxyethyl-pybox (he-pybox) ligand shows improved catalytic activity and enantioselectivity for asymmetric Mukaiyama-aldol reactions in aqueous media. This water-stable chiral Lewis acid promotes condensation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::081850de8dc221feadb0a1a7e412d67c
https://doi.org/10.1021/jo0621470
https://doi.org/10.1021/jo0621470
Publikováno v:
Tetrahedron Letters. 47:5281-5284
Among various transition metals, iron is nontoxic, cheap and hence of great potential synthetic use. We report herein a water stable chiral Lewis acid containing an iron(II) ion and a pybox -type ligand. The resulting cationic aqua complex of C 2 -sy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ad7a1a4f83dbc12d210fdef9cf2e76b
https://doi.org/10.1016/j.tetlet.2006.05.140
https://doi.org/10.1016/j.tetlet.2006.05.140
Publikováno v:
Tetrahedron Letters. 51:4088-4090
A chiral prolinamide-based zinc complex promotes the aldol reaction of ketones with aqueous formaldehyde, giving the corresponding adducts in good yields and high ees. The efficient direct aldol reaction of formaldehyde with ketones in homogeneous aq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5edd05e0bcdf772341e7c208192e4f5e
https://doi.org/10.1016/j.tetlet.2010.05.134
https://doi.org/10.1016/j.tetlet.2010.05.134
Publikováno v:
Tetrahedron Letters. 50:1639-1641
The tertiary amine-catalyzed direct asymmetric aldol reaction of hydroxyacetone with a variety of aromatic aldehydes is developed. Using 5–10 mol % of quinidine as catalyst, the direct aldol condensation products were obtained in reasonable yields
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9db05e1b9c9c9246d4d6177999535ad9
https://doi.org/10.1016/j.tetlet.2009.01.119
https://doi.org/10.1016/j.tetlet.2009.01.119
Publikováno v:
ChemInform. 41
Aldol reactions of cyclic ketones with aqueous formaldehyde are catalyzed by a chiral prolinamide based zinc complex to afford the corresponding adducts with high enantioselectivity.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13d9932ad9f07ab1fabc2f515189516c
https://doi.org/10.1002/chin.201046054
https://doi.org/10.1002/chin.201046054
Publikováno v:
ChemInform. 40
Asymmetric organometallic and organocatalytic processes in aqueous systems are currently of great interest. A few years ago, only a few practitioners studied the subject; now organic reactions in water have become one of the most exciting research ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5c86f8e1e698636cb7f10897e3446292
https://doi.org/10.1002/chin.200936238
https://doi.org/10.1002/chin.200936238
Publikováno v:
ChemInform. 40
The tertiary amine-catalyzed direct asymmetric aldol reaction of hydroxyacetone with a variety of aromatic aldehydes is developed. Using 5–10 mol % of quinidine as catalyst, the direct aldol condensation products were obtained in reasonable yields
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6a16d1578e5948a09c88bfe55c3fea1
https://doi.org/10.1002/chin.200929068
https://doi.org/10.1002/chin.200929068