Asymmetric Hydrogenation of 3-Substituted Pyridinium Salts

The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3N, a Rh‐JosiPhos catalyst reduced a range of pyridinium salts with ee...

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Vydáno v:Chemistry : a European journal Ročník 22; číslo 28; s. 9528 - 9532
Hlavní autoři: Renom-Carrasco, Marc, Gajewski, Piotr, Pignataro, Luca, de Vries, Johannes G., Piarulli, Umberto, Gennari, Cesare, Lefort, Laurent
Médium: Journal Article
Jazyk:angličtina
Vydáno: WEINHEIM Blackwell Publishing Ltd 04.07.2016
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ISSN:0947-6539, 1521-3765, 1521-3765
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Abstract The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3N, a Rh‐JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate. Ariadne′s thread: The asymmetric hydrogenation of 3‐substitued pyridines has been achieved with up to 90 % ee. The use of an equivalent amount of an organic base turned out to be crucial to avoid unwanted pathways leading to non‐enantioselective reduction. An in‐depth investigation of the mechanism revealed a labyrinth of hydrogenation pathways with many dead ends (see figure).
AbstractList The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3N, a Rh-JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90%. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate.
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3 N, a Rh-JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate.
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et sub(3)N, a Rh-JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90%. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate. Ariadne's thread: The asymmetric hydrogenation of 3-substitued pyridines has been achieved with up to 90% ee. The use of an equivalent amount of an organic base turned out to be crucial to avoid unwanted pathways leading to non-enantioselective reduction. An in-depth investigation of the mechanism revealed a labyrinth of hydrogenation pathways with many dead ends (see figure).
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3N, a Rh‐JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate. Ariadne′s thread: The asymmetric hydrogenation of 3‐substitued pyridines has been achieved with up to 90 % ee. The use of an equivalent amount of an organic base turned out to be crucial to avoid unwanted pathways leading to non‐enantioselective reduction. An in‐depth investigation of the mechanism revealed a labyrinth of hydrogenation pathways with many dead ends (see figure).
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3 N, a Rh-JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate.The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3 N, a Rh-JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate.
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et 3 N, a Rh‐JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %. The role of the base was elucidated with a mechanistic study involving the isolation of the various reaction intermediates and isotopic labeling experiments. Additionally, this study provided some evidence for an enantiodetermining step involving a dihydropyridine intermediate.
Author Gajewski, Piotr
Renom-Carrasco, Marc
de Vries, Johannes G.
Lefort, Laurent
Pignataro, Luca
Piarulli, Umberto
Gennari, Cesare
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Issue 28
Keywords SCOPE
MONODENTATE PHOSPHORAMIDITE LIGANDS
reaction mechanisms
QUINOLINES
asymmetric catalysis
DEHYDROAMINO ACID-DERIVATIVES
hydrogenation
MULTIPLE STEREOGENIC CENTERS
IRIDIUM-CATALYZED HYDROGENATION
HIGHLY ENANTIOSELECTIVE HYDROGENATION
pyridines
homogeneous catalysis
REDUCTION
PIPERIDINES
ISOQUINOLINIUM SALTS
Language English
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Snippet The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium...
The use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N-benzylated 3-substituted pyridinium...
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SubjectTerms asymmetric catalysis
Asymmetry
Chemistry
Chemistry, Multidisciplinary
Equivalence
homogeneous catalysis
Hydrogenation
Isotopic labeling
Labyrinth
Pathways
Physical Sciences
Piperidine
Pyridines
reaction mechanisms
Salts
Science & Technology
Title Asymmetric Hydrogenation of 3-Substituted Pyridinium Salts
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https://www.proquest.com/docview/1825536050
Volume 22
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