Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid

This thesis describes my work on nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid. It contains three main parts. Chapter one reports a highly enantioselective asymmetric hydrogenation of hydrazones with a chiral ligand, (S)-Binapine. Both aryl an...

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Main Author: Xu, Haiyan
Other Authors: Steve Zhou
Format: Theses and Dissertations
Language:English
Published: 2017
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Online Access:http://hdl.handle.net/10356/72337
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-723372023-02-28T23:49:28Z Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid Xu, Haiyan Steve Zhou School of Physical and Mathematical Sciences DRNTU::Science::Chemistry::Organic chemistry This thesis describes my work on nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid. It contains three main parts. Chapter one reports a highly enantioselective asymmetric hydrogenation of hydrazones with a chiral ligand, (S)-Binapine. Both aryl and aliphatic methyl hydrazones afforded the desired products in good to excellent ee values. Furthermore, DFT calculation revealed that the nickel catalyst controls the asymmetric hydride insertion to unsaturated C=N bonds by controlling the binding conformation of the amide directing group, instead of differentiating group on the imine fragment. Chapter two describes asymmetric reductive amination of simple ketones with sulfonamides in one pot. With a nickel/(S)-Binapine catalytic system, a series of chiral tosylamines were obtained in high enantioselectivities. This one-pot reductive amination of simple ketones is operationally simple and avoids the isolation and purification of the intermediate tosylimines. Chapter three reports the asymmetric hydrogenation of olefins for the synthesis of unnatural amino acid derivatives, using a nickel catalyst ligated by a chiral bisphosphine (S)-Binapine. In some cases of cyclic tetra-substituted dehydroamino acid derivatives, good yields and excellent ee values were achieved. ​Doctor of Philosophy (SPMS) 2017-06-08T02:48:08Z 2017-06-08T02:48:08Z 2017 Thesis Xu, H. (2017). Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid. Doctoral thesis, Nanyang Technological University, Singapore. http://hdl.handle.net/10356/72337 10.32657/10356/72337 en 196 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Chemistry::Organic chemistry
spellingShingle DRNTU::Science::Chemistry::Organic chemistry
Xu, Haiyan
Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
description This thesis describes my work on nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid. It contains three main parts. Chapter one reports a highly enantioselective asymmetric hydrogenation of hydrazones with a chiral ligand, (S)-Binapine. Both aryl and aliphatic methyl hydrazones afforded the desired products in good to excellent ee values. Furthermore, DFT calculation revealed that the nickel catalyst controls the asymmetric hydride insertion to unsaturated C=N bonds by controlling the binding conformation of the amide directing group, instead of differentiating group on the imine fragment. Chapter two describes asymmetric reductive amination of simple ketones with sulfonamides in one pot. With a nickel/(S)-Binapine catalytic system, a series of chiral tosylamines were obtained in high enantioselectivities. This one-pot reductive amination of simple ketones is operationally simple and avoids the isolation and purification of the intermediate tosylimines. Chapter three reports the asymmetric hydrogenation of olefins for the synthesis of unnatural amino acid derivatives, using a nickel catalyst ligated by a chiral bisphosphine (S)-Binapine. In some cases of cyclic tetra-substituted dehydroamino acid derivatives, good yields and excellent ee values were achieved.
author2 Steve Zhou
author_facet Steve Zhou
Xu, Haiyan
format Theses and Dissertations
author Xu, Haiyan
author_sort Xu, Haiyan
title Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
title_short Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
title_full Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
title_fullStr Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
title_full_unstemmed Nickel-catalyzed asymmetric transfer hydrogenation of unsaturated C=C and C=N bonds using formic acid
title_sort nickel-catalyzed asymmetric transfer hydrogenation of unsaturated c=c and c=n bonds using formic acid
publishDate 2017
url http://hdl.handle.net/10356/72337
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