Zobrazeno 1 - 10 of 14 pro vyhledávání: '"Helen A. McManus"'
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ChemInform Abstract: Synthesis of Bis(oxazoline) Ligands Possessing C-5 gem-Disubstitution and Their Application in Asymmetric Friedel-Crafts Alkylations
Autor: Steven O'Reilly, Caoimhe Keogh-Hansen, Helen A. McManus, Patrick J. Guiry, Helge Mueller-Bunz, Miriam Aylward, Brian Fitzpatrick
Publikováno v: ChemInform. 47
High levels of enantioselectivities are obtained for the conversion of compound (I) with the C5 gem-disubstituted ligand (BOX), whereas for the conversion of compound (IV) the best enantioselectivity is achieved with ligand (BXB).
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e977300c7ef7b23fb532ff9fc7318cb5
https://doi.org/10.1002/chin.201609025
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2
Concise Enantioselective Total Syntheses of (+)-Homochelidonine, (+)-Chelamidine, (+)-Chelidonine, (+)-Chelamine and (+)-Norchelidonine by a PdII-Catalyzed Ring-Opening Strategy
Autor: Alena Rudolph, Walter H. Chan, Chris Dockendorff, Matthew J. Fleming, Helen A. McManus, Jérémy Ruiz, Mark Lautens
Publikováno v: Chemistry - A European Journal. 14:2112-2124
New enantioselective syntheses of the B/C hexahydrobenzo[c]phenanthridine alkaloids (+)-homochelidonine, (+)-chelamidine, (+)-chelidonine, (+)-chelamine, and (+)-norchelidonine are described. Our rapid and convergent route to this class of natural pr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b53fc69d0e4d7f98bbe958976ce5614
https://doi.org/10.1002/chem.200701775
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4
Synthesis of Bis(oxazoline) Ligands Possessing C-5 gem-Disubstitution and Their Application in Asymmetric Friedel-Crafts Alkylations
Autor: Patrick J. Guiry, Helen A. McManus, Caoimhe Keogh-Hansen, Steven O'Reilly, Helge Müller-Bunz, Brian Fitzpatrick, Miriam Aylward
Publikováno v: The Journal of organic chemistry. 80(20)
A series of eight novel bis(oxazoline) ligands incorporating gem-disubstitution on one of the oxazoline rings were prepared from (S)-valine. These ligands are designed as a cost-effective alternative to similar ligands possessing an oxazolinyl C(5)-t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b68d5712572bf89b60fe930990ce4c69
https://pubmed.ncbi.nlm.nih.gov/26406290
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5
Coupling of Bulky, Electron-Deficient Partners in Aryl Amination in the Preparation of Tridentate Bis(oxazoline) Ligands for Asymmetric Catalysis
Autor: Patrick J. Guiry, Helen A. McManus
Publikováno v: The Journal of Organic Chemistry. 67:8566-8573
A new class of tridentate bis(oxazoline) ligands 7, in which an N-phenylaniline unit links the two oxazoline rings, has been prepared. The key step in their synthesis is a Hartwig-Buchwald type Pd-catalyzed aryl amination between the two bulky o-subs
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::721ebda5548a37369997fe6fe6ffd4a9
https://doi.org/10.1021/jo0262558
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9
Application of Tridentate Bis(oxazoline) Ligands in Catalytic Asymmetric Nozaki—Hiyama Allylation and Crotylation: An Example of High Enantioselection with a Non-Symmetric Bis(oxazoline) Ligand
Autor: Helen A. McManus, Patrick J. Guiry, Pier Giorgio Cozzi
Publikováno v: ChemInform. 37
A series of both symmetric and non-symmetric bis(oxazoline) ligands was applied in the Nozaki–Hiyama allylation and crotylation of benzaldehyde. It was found that both the magnitude and sense of the asymmetric induction depended strongly on the nat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::47764f82036b39f0f6469ad69025d47b
https://doi.org/10.1002/chin.200627074
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